Next Article in Journal
Economic Analysis of Flood Risk Applied to the Rehabilitation of Drainage Networks
Previous Article in Journal
Soil-Gas Diffusivity-Based Characterization of Variably Saturated Agricultural Topsoils
 
 
Article

Water Budget, Biological Water Use, and the Soil Hydrological Cycle across Typical Ecosystems of the Heihe River Basin

State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
*
Author to whom correspondence should be addressed.
Academic Editor: Achim A. Beylich
Water 2022, 14(18), 2895; https://doi.org/10.3390/w14182895
Received: 26 July 2022 / Revised: 31 August 2022 / Accepted: 8 September 2022 / Published: 16 September 2022
(This article belongs to the Special Issue Plant-Water Interactions under a Changing Environment)
Quantification of the water budget of an arid inland river ecosystem is essential but still a challenge for the sustainable development of water resources. In situ observed data were used to analyze the monthly and annual water budgets and the soil hydrological cycle for six typical ecosystems in the Heihe River Basin (HRB). The two-source model was used to partition evapotranspiration (ET) into transpiration (T) and evaporation, after which the validated model was applied to quantitatively analyze the biological water use fraction [T/Ecosystem Water Supply (WS)] for different ecosystems. There were differences in the water budgets of the different ecosystems due to differences in climate, vegetation, soil, and external inputs. Precipitation in the HRB decreased from upstream to downstream, whereas there was a gradual increase in ET. External sources of water (e.g., natural runoff from upstream, irrigation in the middle reaches, and groundwater recharge in the lower reaches) to soil layers played an important role in regulating the water budgets of HRB ecosystems. Cropland obtained the maximum biological water use fraction (0.50), followed by Populus euphratica (0.49), alpine meadow (0.49), alpine swamp meadow (0.44), Tamarix ramosissima (0.42), and Kalidium foliatum (0.4). The soil water residence time (at a depth of 40 cm) varied from 14 d to 97 d (average of 60 d). The order of plant species in terms of soil water residence time was: K. foliatum (88 d) > T. ramosissima (72 d) > alpine meadow (68 d) > alpine swamp meadow (63 d) > cropland (53 d) > P. euphratica forest (20 d). Differences in the biological water use fraction and soil water residence time could be attributed to the characteristics of the water budget for each ecosystem. This study quantified the water budget, biological water use, and soil hydrological cycle across typical ecosystems in HRB, and can act as a reference for ecosystem management of the arid inland river basin. View Full-Text
Keywords: water budget; biological water use fraction; Heihe River Basin; evaporation and transpiration; two-source model water budget; biological water use fraction; Heihe River Basin; evaporation and transpiration; two-source model
Show Figures

Figure 1

MDPI and ACS Style

Chen, Q.; Xing, Y.; Zhang, D.; Sun, H.; Wang, P. Water Budget, Biological Water Use, and the Soil Hydrological Cycle across Typical Ecosystems of the Heihe River Basin. Water 2022, 14, 2895. https://doi.org/10.3390/w14182895

AMA Style

Chen Q, Xing Y, Zhang D, Sun H, Wang P. Water Budget, Biological Water Use, and the Soil Hydrological Cycle across Typical Ecosystems of the Heihe River Basin. Water. 2022; 14(18):2895. https://doi.org/10.3390/w14182895

Chicago/Turabian Style

Chen, Qi, Yuhua Xing, Dapeng Zhang, Haitao Sun, and Pei Wang. 2022. "Water Budget, Biological Water Use, and the Soil Hydrological Cycle across Typical Ecosystems of the Heihe River Basin" Water 14, no. 18: 2895. https://doi.org/10.3390/w14182895

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop