Spatiotemporal Evolution and Attribution Analysis of Water Yield in the Xiangjiang River Basin (XRB) Based on the InVEST Model

Abstract

As a result of climate change and human activities, water resources in the Xiangjiang River Basin (XRB) are subject to seasonal and regional shortages. However, previous studies have lacked assessment of the spatiotemporal evolution of water yield in the XRB at seasonal and monthly scales and quantitative analysis of the driving forces of climate change and land use on water-yield change. Quantitative evaluation of water yield in the XRB is of great significance for optimizing water-resource planning and allocation and maintaining ecological balance in the basin. In this paper, the seasonal water-yield InVEST model and modified Morris sensitivity analysis were combined to study the characteristics of monthly water yield in the XRB. Seventeen attributes were identified using the Budyko framework. The results show that: (1) the water yield of the XRB showed an increase trend from northeast to southwest from 2006 to 2020; (2) the transfer-in of unused land, grassland, woodland and farmland as well as the transfer-out of water and construction land have positive effects on the increase in water yield, and the change to construction land has the greatest impact on water yield; (3) water yield is positively correlated with NDVI and precipitation and negatively correlated with potential evapotranspiration; (4) climate change and land-use change contributed to water-yield changes of 67.08% and 32.92%, respectively.

Spatiotemporal Variation and Factors Influencing Water Yield Services in the Hengduan Mountains, China

“…lulc_veg is assigned a value of 1, according to the InVEST handbook for vegetation cover land use types other than wetlands, and a value of 0 for all other land use types. The root_depth represents the maximum rooting depth, and Kc represents the evapotranspiration coefficient for each LULC type, with values referencing the sources of reference to previous studies as well as to the InVEST model's recommended parameters [37][38][39][40]. Multiple simulations were performed and a Z value of 15 was determined when the watershed yield and the total water yield from the water resources bulletin were closest.…”

Enhancing Water Ecosystem Services Using Environmental Zoning in Land Use Planning

“…Therefore, nutrient and sediment cycles are also affected as they are inherently connected to hydrological cycles and energy cycles [3,4]. In addition to the direct impacts on habitats and biodiversity [5], studies have shown that LULC changes can affect WESs [6], including water yield [7][8][9][10], water purification, erosion control, and flood regulation [11][12][13][14]. Although LULC may enhance the supply of some ecosystem services, such as food and timber, the degradation of these WESs may impact human well-being and public health in the long term, causing a scarcity of water for human consumption, irrigation losses, and energy-generation-related issues [15,16].…”