Evolutionary trend of water cycle in Beichuan River Basin of China under the influence of vegetation restoration
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Abstract:
To understand the influence of vegetation restoration on the water cycle in semiarid areas, the effects of vegetation restoration on evolution of the key elements of water cycle were clarified by analyzing the evolutionary trend of atmospheric precipitation, ecological consumption water, and surface runoff on a river basin scale on the basis of analytical results of the changes in vegetation coverage and the long-term meteorological and hydrological monitoring data of Beichuan River Basin. The results show that the vegetation cover in the Beichuan River basin has rapidly increased in the hilly and mountainous areas since the 1980s, especially from 2000 to 2019, with the maximum and average vegetation cover rates increased by 14.98% and 52.2%, respectively. During 1956-2016, the annual precipitation in the basin remained relatively stable; the annual surface runoff slightly declined, with an average attenuation rate of 20 million m3/10a. The main reason for the runoff decline is the increase in ecological water induced by the vegetation restoration, which has changed the spatial-temporal distribution of the water from atmospheric precipitation in the basin. Spatially, more precipitation was converted into ecological water. As a result, the remnant runoff supplied to the lower reaches reduced accordingly. Temporally, more precipitation participated in the soil water - groundwater cycle, thus prolonging the outward drainage period of the precipitation. Moreover, the large-scale vegetation restoration induced a significant decrease in the surface wind speed, evaporation from water surface and drought index. As a result, a virtuously mutual feedback relationship was formed between the vegetation and meteorological elements. Therefore, vegetation restoration is of great significance for the improvement in the water conservation capacity and semiarid climate conditions in the Beichuan River basin.
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Table 1. Statistics of changes in the vegetation cover in the Beichuan River basin according to the data of 2000 and 2019
Range of vegetation coverage (%) 2000 2019 Area (km2) Percentage (%) Area (km2) Percentage (%) <50 51.49 1.53 75.93 2.25 50-60 126.23 3.74 120.88 3.59 60-70 279.86 8.30 222.50 6.60 70-80 991.26 29.41 659.51 19.56 80-100 1 922.15 57.02 2 292.60 68.01 Average 75.32 80.33 
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Table 2. Statistics of changes in water cycle elements before and after vegetation restoration under the condition of average annual precipitation over the years
Ecological consumption water
(100 million m3)Surface runoff
(100 million m3)Baseflow
(100 million m3)1956-1970 8.92 4.40 2.43 2000-2016 10.03 3.58 2.14 Difference (100 million m3) 1.11 −0.82 −0.29 Change rate (%) 12.4 −18.6 −11.9
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