Spatio-temporal variation and driving factors of water supply and demand in Shiyang River Basin

doi:10.7522/j.issn.1000-694X.2024.00065

Journal of Desert Research ›› 2024, Vol. 44 ›› Issue (6): 87-99.DOI: 10.7522/j.issn.1000-694X.2024.00065

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Spatio-temporal variation and driving factors of water supply and demand in Shiyang River Basin

Honghua Xia¹^,²(), Linshan Yang¹(), Qi Feng¹, Yingqing Su¹, Xingyi Zou², Wanghan He²

^1.Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^2.University of Chinese Academy of Sciences，Beijing 100049，China

Received:2024-05-26 Revised:2024-07-02 Online:2024-11-20 Published:2024-12-06
Contact: Linshan Yang

Abstract

Abstract:

To promote the scientific utilization of regional water resources and the sustainable development of the ecological environment， it was imperative to conduct research on the matching relationship between water yield supply and demand in river basins. In this regard， the Shiyang River Basin （SYB） was chosen as the study area. Employing a range of methodologies including remote sensing imagery， site monitoring data， and reanalysis product data from 1990， 2000， 2010， and 2020， we utilize the InVEST model， water demand estimation method， and geographic detector to comprehensively analyze the status and evolution characteristics of the water yield supply and demand in the SYB during the aforementioned period. This research aims to contribute to the advancement of sustainable water resource allocation in the region and was a critical step towards achieving long-term ecological balance and sustainable development in the basin. The results showed that：（1） Over the period spanning from 1990 to 2020， the spatial distribution of water supply within the SYB has been characterized by a high concentration in the southwest and a lower level in the northeast region. The lowest water yield occurred in 1990， measuring approximately 16.56×10⁸ m³， while the highest yield was recorded in 2010， amounting to around 19.37×10⁸ m³. Woodland and grassland exhibit the highest contribution rates in terms of water production. （2）The water demand in 1990 was the highest （20.39×10⁸ m³） and the lowest in 2020 （17.78×10⁸ m³）. Cultivated land is the land use type with the highest water demand in the basin. （3） The matching degree of water supply and demand in the southwestern mountainous area of the basin is higher， followed by the Shiyang River mainstream and tributary area， while the matching degree of water supply and demand in the northeastern and eastern regions of the basin is lower. The polarization of supply and demand index in the study area is obvious， and the spatial distribution of water resources supply and demand in the region is extremely uneven. From 1990 to 2020， the matching status of water production services in Shiyang River showed signs of gradual improvement， and the matching degree of supply and demand of water production services in the basin was significantly improved in 2020. （4） The results of the geo-detector show that the largest factor affecting the spatial differentiation of water yield in the basin among the ten factors was the average annual precipitation. Additionally， the combined effect of multiple driving factors and their interactions has a greater explanatory power than that of a single factor alone. Furthermore， there were two types of enhancement observed： the synergistic effect of two-factor combinations and non-linear enhancements. Therefore， it is crucial to prioritize the strengthening of adaptive management policies for watershed climate change and to promote coordinated watershed management.

Key words: water yield, supply and demand relationship, spatio-temporal pattern, InVEST model, Shiyang River Basin

CLC Number:

X171

Honghua Xia, Linshan Yang, Qi Feng, Yingqing Su, Xingyi Zou, Wanghan He. Spatio-temporal variation and driving factors of water supply and demand in Shiyang River Basin[J]. Journal of Desert Research, 2024, 44(6): 87-99.

Figures/Tables 10

Fig.1 Location of the study area

Table 1 Classification of supply and demand of water production service

分级标准	供需指数SDI取值
高度赤字	-1~-0.9
中高度赤字	-0.9~-0.7
中度赤字	-0.7~-0.5
轻度赤字	-0.5~0.0
轻度盈余	0.0~0.5
中度盈余	0.5~0.7
中高度盈余	0.7~0.9
高度盈余	0.9~1.0

Fig.2 The difference between natural runoff and simulated water yield

Fig.3 Spatial distribution pattern of water production service supply in the basin from 1990 to 2020

Table 2 Water yield depth and average water yield of different land use types in the basin from 1980 to 2020

年份	耕地/mm	林地/mm	草地/mm	水域/mm	建设用地/mm	未利用土地/mm	平均产水深度/mm	平均产水量/10⁸m³
1990	32.98	130.14	81.13	0.01	1.85	10.24	41.40	16.65
2000	36.23	136.46	86.13	0.03	1.27	10.97	43.90	17.81
2010	38.48	149.46	95.40	0.05	1.23	11.61	47.75	19.37
2020	37.70	151.06	89.20	0.03	1.75	9.82	45.19	18.32

Fig.4 Spatial distribution pattern of water production service demand in the basin from 1990 to 2020

Table 3 Water production service demand and annual total demand of various land use types in the basin from 1990 to 2020

年份	耕地	林地	草地	建设用地	需求总量
1990	15.20	0.72	1.46	3.01	20.39
2000	15.88	0.47	0.83	1.89	19.07
2010	14.93	0.47	0.94	2.99	19.33
2020	13.70	0.45	0.60	3.03	17.78

Fig.5 Spatial distribution pattern of water supply and demand difference in the basin from 1990 to 2020

Fig.6 The area change and time series evolution characteristics of supply-demand index from 1990 to 2020

Fig.7 Detection results of driving factors of spatial pattern of water supply in watershed

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Spatio-temporal variation and driving factors of water supply and demand in Shiyang River Basin

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