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Article

Effects of Land-Use and Land-Cover Change on Nitrogen Transport in Northern Taihu Basin, China during 1990–2017

by 1, 1,2,3,*, 1,2,3, 1,2,3 and 4,*
1
School of Geography Science, Nanjing Normal University, Nanjing 210023, China
2
Key Laboratory of Virtual Geographic Environment, Nanjing Normal University, Ministry of Education, Nanjing 210023, China
3
Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China
4
Chinese Research Academy of Environmental Sciences, Beijing 100012, China
*
Authors to whom correspondence should be addressed.
Sustainability 2020, 12(9), 3895; https://doi.org/10.3390/su12093895
Received: 19 March 2020 / Revised: 1 May 2020 / Accepted: 7 May 2020 / Published: 10 May 2020
(This article belongs to the Collection Eutrophication and Sustainable Management of Water)
Different land uses have varying degrees of impact on nitrogen transport in the catchments. In recent decades, rapid urbanization has dramatically changed the Earth’s land surface, which may cause excessive nitrogen losses and a negative influence on the environment. In the long-term scale, it is important to explore how the nitrogen transport responds to land use change and its effects on aquatic habitats. In this study, the water and sediment samples were collected from northern Taihu Basin, and nine periods of land use data were obtained using the techniques of supervised classification. Results revealed that the proportion of farmland area decreased from 28.33% to 7.09%, while that of constructed land area increased from 23.85% to 61.72% during 1990–2017. Most of the constructed land originated from farmland, which makes it the dominant land use type due to rapid urbanization. In spatial distribution, high total nitrogen (TN) losses regions remain distributed over constructed land and farmland, which may aggravate the trend of local water quality deterioration. Of these regions, constructed land was the dominant contributor (46.29%–63.62%) of TN losses from surface runoff. In temporal variation, the TN losses of runoff decreased by 47% from 175 t N·a−1 in 1990. However, they increased by 2.91% from 75.28 t N·a−1 after 2013 with rapid population growth and high fertilizer application (>570 kg·ha−1). The nitrogen load in sediments also has a significant response (t = 2.43, p = 0.02) to the effects of land use change on the overlying water, indicating that the role of nitrogen in the sediment as a source and/or sink to the waterbody may change frequently. Given the increasing accumulation of nitrogen loads in highly urbanized regions, water quality would cause more aggravation in the long-term without reasonable land management measures. View Full-Text
Keywords: Taihu Basin; land use change; nitrogen losses; nitrogen transport; water eutrophication Taihu Basin; land use change; nitrogen losses; nitrogen transport; water eutrophication
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MDPI and ACS Style

Chen, X.; Wang, Y.; Cai, Z.; Wu, C.; Ye, C. Effects of Land-Use and Land-Cover Change on Nitrogen Transport in Northern Taihu Basin, China during 1990–2017. Sustainability 2020, 12, 3895. https://doi.org/10.3390/su12093895

AMA Style

Chen X, Wang Y, Cai Z, Wu C, Ye C. Effects of Land-Use and Land-Cover Change on Nitrogen Transport in Northern Taihu Basin, China during 1990–2017. Sustainability. 2020; 12(9):3895. https://doi.org/10.3390/su12093895

Chicago/Turabian Style

Chen, Xi, Yanhua Wang, Zucong Cai, Changbin Wu, and Chun Ye. 2020. "Effects of Land-Use and Land-Cover Change on Nitrogen Transport in Northern Taihu Basin, China during 1990–2017" Sustainability 12, no. 9: 3895. https://doi.org/10.3390/su12093895

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