In:
Hydrological Processes, Wiley, Vol. 35, No. 9 ( 2021-09)
Abstract:
The vegetation growth of the Loess Plateau is often restricted by water, which seriously threatens the water sustainability of regional ecosystem. In order to clarify the relationship between supply and demand of vegetation water use after Grain for Green Project, this study selected Malian River Basin as the research area and calculated the vegetation water use and water demand using the eco‐hydrological model. The results showed that the annual water demand of the basin was 570 mm, while the average annual water supply was only 294 mm, accounting only for 52.0% of the demand. From 2000 to 2018, the temporal and spatial matching degree of water supply and demand in the Malian River Basin were 0.63 and 0.65, respectively. On the whole, the water resources in Malian River Basin can basically support the growth of vegetation, but in some areas are not sustainable. Water resources in the southern region can only barely maintain the normal growth of vegetation under the current conditions, so it is not recommended to carry out new plantation in this area. The evaluation of matching degree in the northern from January to April is poor, so it is necessary to appropriately reduce the planting area of economic crops and replace it with planting herbaceous plants with small water consumption in Spring. Compared with the current conditions, under the future climate scenarios of ssp126 and ssp585, the Malian River Basin will show a trend of warming and humidification. The temporal matching degree of water supply and demand also significantly improved to 0.83 and 0.92, indicating that even if the planting structure did not change significantly, water supply would gradually meet the needs of vegetation. The study results can provide the basis for formulating more scientific and reasonable vegetation restoration policies.
Type of Medium:
Online Resource
ISSN:
0885-6087
,
1099-1085
Language:
English
Publisher:
Wiley
Publication Date:
2021
detail.hit.zdb_id:
1479953-4
SSG:
14
