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Review

Research Progress on Changes in Land Use and Land Cover in the Western Himalayas (India) and Effects on Ecosystem Services

by
Partho Protim Mondal
1,2 and
Yili Zhang
1,2,3,*
1
Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China
*
Author to whom correspondence should be addressed.
Sustainability 2018, 10(12), 4504; https://doi.org/10.3390/su10124504
Submission received: 30 September 2018 / Revised: 21 November 2018 / Accepted: 27 November 2018 / Published: 29 November 2018
(This article belongs to the Section Environmental Sustainability and Applications)

Abstract

:
Western Himalaya is an important region in terms of its enriched biodiversity and immense ecosystem services (ESS). However, its biodiversity and ESS are under tremendous pressure from rapid population growth, developmental activities, unplanned urbanization, agricultural expansion, climate change, and the associated changes in land use and land cover (LULC). This study provides a systematic review of the composition and pattern of LULC (from existing literature) and the effects of LULC change on various ESS provided by the western Himalayan ecosystems. Despite being such a significant area, data and studies concerning the impacts of LULC change on the spatial distribution of ESS, focused particularly on the western Himalayan region are inadequately reported. Most existing studies indicate a general decrease in forest cover and an increase in forest fragmentation along with generally increasing trends in built-up areas, croplands, and barren lands. These results imply ecosystem degradation and a reduction in the potential for the sustainable flow of ESS from this region. In this respect, this study suggests that quantification and spatial mapping of ESS in the western Himalayan region is conducted.

1. Introduction

Land use refers to the utilization of land for different purposes, whereas land cover indicates the natural and artificial cover on the land surface (e.g., natural vegetation, agriculture, bare earth, water bodies, and man-made structures). Scientists refer to land use as the utilization of land for various human activities, including conservation, development, and mixed uses. On the other hand, land-use and land-cover change (LUCC) refers to the modification of Earth’s terrestrial surface by anthropogenic forces. Although humans have modified land to obtain food and other essential resources for thousands of years, unprecedented LUCC has occurred since the beginning of 20th century. Examples of the extensive changes during this period include a doubling of agricultural land, a four-fold increase in human population, a 14-fold increase in economic production, a 15-fold increase in energy use, and a 17-fold increase in carbon dioxide emissions [1]. LUCC has recently become a major focus area in the global research community [2,3] because of its significant effects on climate change [4,5], biogeochemical cycles [6], ecosystem services (ESS), and biodiversity [7]. LUCC is driven by socio-economic and biophysical phenomena that depend on the spatial location, scale, demographics, political structure, economy, and existing land uses [8,9,10,11,12]. Furthermore, the driving factors of LUCC vary with location and time, making LUCC both spatially and temporally heterogeneous. Therefore, to better understand the human influence on the natural environment, it is essential to investigate the spatial and temporal dynamics of LUCC.
Ecosystem services, which have been defined as benefits that people obtain from ecosystems [13], include provisioning services, regulating services, supporting services, and cultural services. ESS have also been defined as the result of interactions between the biotic and abiotic components of an ecosystem [14]. Lawton defined ESS as the conditions and processes through which ecosystems and the species within them sustain and fulfill human life [15]. Some economists treat ESS as components of nature that are enjoyed, consumed, or used for human well-being [16]. Terrestrial ecosystems provide a number of vital services for people and society, including food, fiber, water resources, fresh air, carbon sequestration, and recreation. ESS at local level are mostly categorized by how they affect human well-being. The sustained availability of ESS in the future depends on changes in socio-economic conditions, land cover, land use policy, biodiversity, and climate. However, the modern gross domestic product (GDP)-driven approach to development shows little consideration for the damages to natural and social capital and replaces natural capital with built capital [17,18]. Furthermore, policies that affect the future ecosystem service potential have the greatest impact on the poorest population [19]. Between 1997 and 2011, the global value of ESS decreased by an estimated USD 20 trillion/year as a result of land use changes [18]. This loss is comparable to approximately 1/3 of global GDP in 2011. Kubiszewski et al. [20] modeled the changes in terrestrial ESS in 47 countries in the Asia Pacific and Oceania regions from 2011 to 2050 under four future scenarios: Market forces (MF), fortress world (FW), policy reform (PR), and great transition (GT) [21,22,23]. Under the MF and FW scenarios, they predicted that ESS in India will decrease by 14% and 26% compared to the 2011 values, respectively. In contrast, they predicted that ESS would remain stable under the PR scenario and increase by 21% under the GT. These predictions are consistent with the recently adopted United Nations Sustainable Development Goals [24]. Therefore, mapping and valuation of ESS are of great significance for conservation and local development planning [25]. Qualifying and quantifying ecosystem goods and services and integrating their local value with their market value can help both local users and national decision-makers make balanced and sustainable management decisions in consideration of the equality principle [26,27]. Various studies [28,29] on ESS mapping and valuation found that methodologies differ widely, in terms of estimation of spatial variations of ESS values, their geographic range, and the rationale and focus of ESS. Recently, several spatially explicit modeling approaches have been developed for ecosystem assessment [30,31]. These approaches combine the potential effects of land use changes with vulnerability assessments and rely on ecological information to map, quantify, and value ESS across a landscape [32].
India is amongst a few countries that have developed a biogeographic classification system, which serves as the basis for conservation planning. According to this four-tier classification scheme [33], India is classified into 10 biogeographic zones that are further divided into 26 biotic provinces. A biogeographic zone is a large unit with distinctive ecology, biome representation, community, and species; examples include the Himalaya and the western Ghats. In contrast, a biotic province is a secondary unit within a zone. Biotic provinces represent particular communities separated by dispersal barriers or gradual changes in environmental factors (e.g., the northwestern and western Himalaya on either side of the Sutlej River). The watersheds of the western Himalayas are extremely important both for their biodiversity and the ecosystem services they provide to the downstream densely populated north Indian plains. This region faces severe challenges in terms of population explosion, intense natural resources extraction, and forest fragmentation resulting in rapid changes in land-use and land-cover pattern. Ecosystem services such as water security, nutrient cycling, climate change mitigation, biodiversity conservation, and rural livelihoods are today under serious threat. Spatial map of ESS valuation data can greatly help managers and decision makers to identify the potential areas vulnerable to changes in ecosystem services at landscape level. Thus, the objective of this review work is to scientifically collect, analyze, and synthesize information related to the status and dynamics of LUCC and the impacts of developmental activities on ESS flow and sustainability in this region.

2. Study Area and Data Sources

2.1. Study Area

The study area is the western Himalaya biotic province (Figure 1), which covers 51,747 km2 between latitudes 29°08′14″ N to 31°51′54″ N and longitudes 76°22′50″ E to 81°03′14″ E. The western Himalaya biotic province incorporates almost all of Uttarakhand and part of Himachal Pradesh, two adjoining hill states in northern India. Approximately 86% of the state of Uttarakhand is mountainous, while about 71% is covered by forest [34]. Almost all of Himachal Pradesh is mountainous, with elevation ranging from 450 to 6500 m and about 66% is covered by forest [34].

2.2. Sources of Data

To systematically review the overall land use/land cover (LULC) status and LUCC over a period of almost 130 years, we reviewed the available published literature, documents, and reports and analyzed available spatial datasets. The available western Himalayan region-level LULC studies carried out by various authors/agencies are listed in Table 1.
First, available literature was searched using specific keywords from various web resources such as Web of Science, ResearchGate, Google Scholar, and most relevant and recent studies from major journals and books from Elsevier, Springer, Science, Nature, and other journals were collected for review. The literature was searched with keywords including land use land cover, land use and land cover change, land use and land cover dynamics, ecosystem services, ecosystem services valuation, Himalaya, and western Himalaya.
Furthermore, LULC datasets were obtained from various Internet portals such as the National Remote Sensing Centre (NRSC), National Bureau of Soil Survey and Land Use Planning (NBSSLUP), Food and Agriculture Organization (FAO). Most studies used Landsat and Indian Remote Sensing (IRS) series satellite images. Non-spatial and qualitative studies on LUCC were completed using inventory [45] and secondary sources from official Statistical Year Book of India [46], published government reports, and research papers along with national and international project reports.

3. Land Use and Land Cover Change (LUCC) in the Western Himalayan Region

During the last 100 years, LUCC in India has been characterized by agricultural expansion at the expense of forests [47]. However, since the 1960s, the implementation of a modern economic development policy has set new courses and direction regarding LUCC processes. Agriculture modernization and transformation (known as the Green Revolution) through the use of high-yield varieties, extension of irrigation facilities, introduction of mechanized tools, and use of fertilizers and pesticides, resulted in significant increase of cropland [48]. This coincided with rapid urbanization due to population explosion and economic growth. Tian et al. [49] for the first time, attempted to analyze LULC in India over a period of 130 years (1880–2010). The study integrated high-resolution remote sensing images with archived inventory datasets to reconstruct a time series of LULC records for the entire time period. The results indicated a nearly 30% loss of forest (from 89 to 63 million ha) from 1880 to 2010. In contrast, cropland area increased by 52% from 92 to 140.1 million ha during the same period. This study also revealed that cropland expansion was maximized in the post-independence period from the 1950s to the 1980s, which coincided with the Green Revolution. On the other hand, the trend in urbanization rate, which was relatively slower during 1880 to 1950, has increased significantly after 1950s in tandem with rapid population growth and urbanization.
Similarly, in recent times, the western Himalayan region has undergone rapid changes in LULC due to population explosion, unplanned and unstructured development, and intense resource extraction, resulting in forest fragmentation and biodiversity loss. Although comprehensive and detailed information on the spatial distribution of LULC and drivers of land-cover dynamics over an extended period of time is available, spatial concordance among various datasets varies widely (Figure 2). Table 1 summarizes the different LULC studies in the western Himalayan region reported by various authors. Table 1 indicates that at the regional level, the existing studies based on spatial and non-spatial data sources have produced dissimilar findings. These discrepancies might be attributed to the use of different methodologies and satellite data with differing quality and spatial resolution. Furthermore, there is the inherent difference in definition of “crop” or “forest” or other land use land cover classes as methodologies adopted by different authors.
A few local/watershed-level studies [50,51] in this area revealed increases in agriculture and settlements at the expense of forest and barren land at elevations in the range of 1200 to 1600 m. Naqvi et al. [52] identified LUCC as the primary factor responsible for soil loss in this region and emphasized the importance of adopting soil conservation and vegetation rehabilitation measures to ameliorate soil loss. Munsi et al. [51] quantitatively analyzed the change in forest cover over a two-decade period (1990 to 2006) in the Shiwalik range of the Himalaya (lower Himalaya) in Uttarakhand and found that although forest areas are getting degraded by human disturbances, deforestation/degradation is not a key factor in the expansion of urban areas. Instead, agricultural and fallow lands were found to be the main contributors to the increase in urban areas. Increases in human activities enhance the deforestation rate, forest fragmentation, and the probability of forested areas being converted to another LULC class [53]. The dominant trend in land cover dynamics was found to be a decrease in scrub forest and alpine meadows along with an increase in open forest, cropland, and fallow land [54,55]. Natural Resources Census Project data [56,57] show a general decrease in agricultural land in the two western Himalayan states of Uttarakhand and Himachal Pradesh (2.5% and 6.5%, respectively) between 2005/2006 and 2011/2012; in contrast, the data indicate a significant increase in built-up land (78.1% and 7.8%, respectively) and barren land (55.4% and 50.8%, respectively) during this time period. Forest cover has decreased marginally by 5.61 km2 (0.04%) in Himachal Pradesh between 2005/2006 and 2011/2012, whereas forest cover has increased significantly by 425.17 km2 (1.7%) in the state of Uttarakhand. An analysis of the LULC data from [47] for the western Himalaya biotic zone (Figure 3) indicated a consistent decrease in forest area (1.94% from 1985 to 1995 and 1.07% from 1995 to 2005) along with significant increases in cropland (2.31% from 1985 to 1995 and 15.97% from 1995 to 2005) and built-up land (14.53% from 1985 to 1995 and 19.49% from 1995 to 2005).

4. Impact of Land Use and Land Cover Change on Ecosystem Services in the Western Himalayan Region

The Himalaya, which is often referred to as the Water Tower of Asia, provides key resources for livelihood, including food, fodder, timber, and medicine; a wide range of services such as fresh air, water, climate regulation, and carbon sequestration; and other services including recreational, cultural and spiritual well-being [58,59,60,61,62,63]. In terms of nature and types of ESS, western Himalayan biotic province shares similar characteristics as that of other parts of the Himalayan biogeographic zone. As many as 28 ESS have been identified to be flowing out of the central Himalayan forest ecosystems at three distinct elevation levels, including eight provisioning services (food, fodder, fiber, timber, fuel, fresh water, manure, non-timber forest products), nine regulatory services (air quality maintenance, micro-climate regulation, water regulation, water purification and waste treatment, soil erosion control/slope stability, regulation of soil fertility, biological regulation/pest control, carbon sequestration, seed dispersal), four cultural services (aesthetical value/traditional heritage, spiritual and religious, recreational and community activities, information and knowledge) and seven supporting services (soil formation, nutrient cycling, net primary productivity, pollination, biodiversity resources, wildlife habitat, grazing) [64]. While commercial exploitation such as large-scale infrastructure development and dam construction has historically been a primary cause of forest degradation in the entire Himalayan region including western Himalayan biotic province, chronic disturbances related to the harvesting of fuel wood and fodder, climate change, and changes in traditional land use practices have recently led to serious forest loss, degradation and significant effects on bird and other wildlife diversity [65]. Increased developmental activities, such as hydropower projects, are also modifying local ecosystems through the generation of debris and changes in water flow. The conversion of forested areas for agricultural expansion has resulted in increased surface runoff [66,67,68]. Natural springs are drying up completely, becoming seasonal, or experiencing reduced discharge [69,70,71,72,73], primarily due to land use changes that have led to decreased groundwater recharge. With the current rate of increase in mean annual temperature in various parts of the Himalayas triggered by climate change and local-level changes in land use (e.g., the conversion of forest area into built-up land), an upward movement of plants is expected [74,75,76,77,78,79,80]. Watershed-level carbon dynamics study carried out by Sharma and Rai [81] in the western Himalayan region found that intense LUCC is causing western Himalayan watersheds to become a net source of carbon in the atmosphere (7.78 MgC/ha/yr). Phenological studies indicate the widespread browning of irrigated croplands in contrast to the dominant greening of rain-fed cultivated areas. A spatiotemporal analysis of vegetation trends indicated an advancement of growing season in most regions [82,83,84]. With increasing temperature, upward shifts in agriculture may result in the loss of the remaining small patches of permanent pastures and arable grasslands (locally called Bugyals), loss of crop biodiversity, and reduction in productivity, which will in turn reduce the availability of fodder and adversely affect the livestock and agriculture sectors [85]. These trends in climate change and demographics brought about by rapid unplanned urbanization and related outmigration in the Himalayan region are likely to affect water and energy usage and food security in a variety of ways [86]; in particular, these trends may generate significant changes in land use by way of abandonment of traditional agroforestry practices [87,88] which will lead to land degradation as abandoned land does not automatically lead to re-generation of native vegetation [89]. Changes in traditional land use practices and market-based economies have led to serious vulnerabilities for traditional rain-fed subsistence agroforestry systems, which typically have high ecological adaptability and resilience. This in turn induces high soil loss, runoff, and input cost along with decreased farm productivity of introduced crop varieties with each passing years of cultivation [90,91,92,93,94]. Traditional agroforestry ecosystems, which are the source of many useful ESS [95], are being abandoned due to the outmigration of the male population, resulting in demographic changes and the conversion of agricultural land into permanent fallow [96]. Although many studies have discussed the state and dynamics of LULC change and their causes in western Himalayan region, little attention was given to address the impacts of such changes on various ecosystem services flowing out of this region. Table 2 summarizes list of few key studies that specifically dealt with the impact of land use land cover change on different ecosystem services in the region.

5. Existing Problems and Research Gaps in the Western Himalayan Region

Himalayan ecosystems provide crucial and valuable ESS in greater numbers than any other mountain system; downstream, more than one billion people depend on Himalayan ESS for their daily livelihood [97,98,99,100]. However, the local value of ESS is often ignored or inadequately understood [101]. An exploration of the upstream–downstream linkage reveals that upstream communities play a critical role in sustaining crucial ecosystem functions and the resulting supply of ESS to downstream communities [102]. This relationship may create equality problems. For example, why should products such as food security, hydroelectricity, and domestic water supply, which are consumed mainly by the downstream urban populations, be subsidized at the cost of upstream rural people where these ESS are generated? The lack of fair systems to share benefits with upstream communities where valuable ESS are generated [103], leads to vociferous local protests against development projects such as hydropower dams. Rural populations might choose to stop conserving ecosystems in favor of short-term local benefits, which would be dangerous in the long run if not disastrous. Thus, an appropriate mechanism needs to be developed to transfer the benefits from the consumers of ESS to the producers and in order to ensure fair transfer of benefits/payments for ecosystem services, it is necessary to thoroughly understand the flow of benefits through upstream–downstream linkages. As demonstrated in some parts of the western Himalayan region, it is important for local people to have access to subsidized energy alternatives and modern agricultural technology to enable them to conserve forest resources.
This review identifies some research gaps and critical questions. As LULC is often taken as a proxy for the provision of services [104], lack of spatial concordance between different LULC datasets as outlined in Section 3, will introduce uncertainty in the quantification of ESS across different time scales and may give a contradictory picture about the trend in change in ESS over time. Also the assumed linear relationship between ecosystem structure and provision of services is often untested for and is unlikely to be held as valid [105]. As a result, our understanding of the interaction between ecosystem processes and the resulting provision of services remains relatively poor for most ecosystems and services [106,107]. Certain problem areas exist. For example, in the high mountain areas it is difficult to collect socio-economic and ecological data due to biophysical and socio-political inaccessibility that hampers our understanding of socio-ecological processes and hinders qualitative and quantitative assessment of various services. Government policies mostly follow economic growth-based development models to fight poverty and handle environmental conservation issues. However, in remote and biodiverse areas native communities often have different needs, priorities, cultural requirements, and attachment to the ecosystems; welfare schemes by the government may not fulfill their aspirations as they are often left out of the decision-making process and do not have the capacity to negotiate. There is a need for participatory approaches that consider all stakeholders (i.e., farmers, scientists, agricultural extension agents, and policymakers) and engage and inform local people about the status of ecosystems and the value of their services. There is also a need to develop processes for each local community regarding conservation and maintenance of ESS by recognizing their cultural values and beliefs, traditional knowledge systems, and organizational capacity in decision-making processes and by adopting a participatory and coordinated mixed governance model, which will compliment state-imposed policies, to ensure sustainability of ESS [108,109].

6. Conclusions

Since 1960s, LUCC in western Himalaya, in line with the rest of India, was mainly characterized by agricultural expansion at the expense of forest land, fast population growth and urbanization. Despite being biodiversity rich and treasure trove of ESS, studies related to spatial mapping of ESS and impact of LULC change dynamics on ESS are sparse and not comprehensive in the western Himalayan region. A few watershed/micro-watershed/village level studies exist which identify the local ecosystem services and quantify them, but they do not map various ESS spatially or quantify their economic valuation, thus fail to portray the entire scenario of state and trend of ecosystem services potential of this important region. A regional/landscape level spatial map of area of production of crucial ecosystem services emanating from this region can be immensely beneficial to the national/regional level policy making so that conservation measure or alternative land use regimes can be planned in such a way that it will benefit both the native ecosystems and biodiversity as well as ensure local livelihood, towards achieving the sustainable development goals. Therefore, there is ample scope to carry out further research in this aspect through a large-scale interdisciplinary effort which will also explore the relationships between ecosystem services based on the role of land use change drivers and the interactions between the services.

Author Contributions

Y.Z. had conceptualized the idea for this review. P.P.M. had reviewed the materials and written the original draft. Y.Z. had scrutinized the manuscript and provided input in editing and finalizing the paper. All authors have read and approved the final manuscript.

Funding

This work is supported by a Strategic Priority Research Program of the Chinese Academy of Sciences (XDA20000000), National Natural Science Foundation of China (41761144081), International Partnership Program of Chinese Academy of Sciences (131C11KYSB20160061) and Chinese Academy of Sciences-The World Academy of Sciences (CAS-TWAS) President’s Fellowship Program for international Ph.D. students.

Acknowledgments

The authors are really grateful to Mr. Surajit Ghosh of International Center for Agricultural Research in the Dry Area (ICARDA), New Delhi, India for his valuable comments and inputs and the anonymous reviewers for their constructive suggestions to significantly enhance the manuscript.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. Location of Western Himalaya Biotic Province [33] with Elevation data (freely available GTOPO data from the U.S. Geological Survey [35] and CartoDEM from NRSC/ISRO [36]).
Figure 1. Location of Western Himalaya Biotic Province [33] with Elevation data (freely available GTOPO data from the U.S. Geological Survey [35] and CartoDEM from NRSC/ISRO [36]).
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Figure 2. Comparative analysis of major LULC classes for the western Himalayan biotic province as estimated by various studies for the year 2005.
Figure 2. Comparative analysis of major LULC classes for the western Himalayan biotic province as estimated by various studies for the year 2005.
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Figure 3. Land-use and Land-cover pattern of Western Himalaya Biotic Province; Data Source: [48].
Figure 3. Land-use and Land-cover pattern of Western Himalaya Biotic Province; Data Source: [48].
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Table 1. Summarization of studies on Land-use Land-cover (LULC) (in sq. km.) by various sources in western Himalayan biotic province.
Table 1. Summarization of studies on Land-use Land-cover (LULC) (in sq. km.) by various sources in western Himalayan biotic province.
YearDatasetForestCroplandBuilt-UpDataset TypeReference
2015ESA CCI31644.009890.1934.83S[37]
MODIS-UMD12584.004541.5038.50S[38]
MODIS-IGBP12584.004541.5038.50S[39]
HYDE 3.2-8682.9155.55C[40]
2010ESA CCI31707.639897.0325.38S[37]
MODIS-UMD11631.255572.0037.25S[38]
MODIS-IGBP11631.255572.0037.25S[39]
Moulds24651.179684.60124.22C[41]
HYDE 3.2-8707.1450.13C[40]
2005Roy et al.24617.249748.88118.68S[42]
ESA CCI31535.9110041.0316.92S[37]
MODIS-UMD11908.756073.5037.25S[38]
MODIS-IGBP11909.006073.5037.25S[39]
GlobCover18605.9715601.32-S[43]
Moulds24610.509749.06119.37C[41]
HYDE 3.2-8674.6647.35C[40]
2000ESA CCI31185.5410341.183.96S[37]
GLC20002812818114-S[44]
Moulds24839.929651.86110.25C[41]
HYDE 3.2-8542.8041.54C[40]
1995Roy et al.24884.298544.5099.32S[42]
ESA CCI31041.7210513.982.61S[37]
Moulds25123.019622.09107.59C[41]
1985Roy et al.25375.408351.6186.72S[42]
Moulds25558.409418.5499.19C[41]
1980Moulds25752.749322.3295.56C[41]
HYDE 3.2-8160.1424.77C[40]
1970Moulds28078.077192.9881.84C[41]
HYDE 3.2-7897.6620.82C[40]
1960Moulds28674.406568.3671.70C[41]
HYDE 3.2-7581.7718.33C[40]
1880HYDE 3.2-4657.1912.34C[40]
S = Spatial, C = Spatial + Non-spatial (inventory).
Table 2. List of key studies on the impact of land-use and land-cover change (LUCC) on ecosystem services (ESS).
Table 2. List of key studies on the impact of land-use and land-cover change (LUCC) on ecosystem services (ESS).
Spatial/Non-SpatialStudy ScaleESS Quantified?ESSReference
Provisioning ServicesRegulatory ServicesSupporting ServicesCultural Services
Spatiallocal/micro-watershedyes water regulation (surface runoff), soil erosion control (sediment output) [67]
Spatiallocal/micro-watershedyesfood, fodder, fuel, fresh waterflood regulation/protection [68]
Spatiallocal/watershedyesfood, fresh water, manure, fodder, fuelwater regulation (irrigation) [69]
Spatiallocal/watershedyes carbon sequestration [81]
Non- spatiallocal/village levelnofood, fodderbiological regulation/weed control, soil erosion control, water regulationnet primary productivity [91]
Spatialstate levelno net primary productivity [82]

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Mondal, P.P.; Zhang, Y. Research Progress on Changes in Land Use and Land Cover in the Western Himalayas (India) and Effects on Ecosystem Services. Sustainability 2018, 10, 4504. https://doi.org/10.3390/su10124504

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Mondal PP, Zhang Y. Research Progress on Changes in Land Use and Land Cover in the Western Himalayas (India) and Effects on Ecosystem Services. Sustainability. 2018; 10(12):4504. https://doi.org/10.3390/su10124504

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Mondal, Partho Protim, and Yili Zhang. 2018. "Research Progress on Changes in Land Use and Land Cover in the Western Himalayas (India) and Effects on Ecosystem Services" Sustainability 10, no. 12: 4504. https://doi.org/10.3390/su10124504

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