水保所知识产出(1956---)知识库

The implementation of large-scale vegetation restoration over the Chinese Loess Plateau has achieved clear
improvements in vegetation fraction, as evidenced by large areas of slopes and plains being restored to grassland or forest.
However, such large-scale vegetation restoration has altered land-atmosphere exchanges of water and energy, as the land surface
characteristics have changed. These variations could affect regional climate, especially local precipitation. Quantitatively
evaluating this feedback is an important scientific question in hydrometeorology. This study constructs a coupled land-atmo-
sphere model incorporating vegetation dynamics, and analyzes the spatio-temporal changes of different land use types and land
surface parameters over the Loess Plateau. By considering the impacts of vegetation restoration on the water-energy cycle and on
land-atmosphere interactions, we quantified the feedback effect of vegetation restoration on local precipitation across the Loess
Plateau, and discussed the important underlying processes. To achieve a quantitative evaluation, we designed two simulation
experiments, comprising a real scenario with vegetation restoration and a hypothetical scenario without vegetation restoration.
These enabled a comparison and analysis of the net impact of vegetation restoration on local precipitation. The results show that
vegetation restoration had a positive effect on local precipitation over the Loess Plateau. Observations show that precipitation on
the Loess Plateau increased significantly, at a rate of 7.84 mm yr −2 , from 2000 to 2015. The simulations show that the con-
tribution of large-scale vegetation restoration to the precipitation increase was about 37.4%, while external atmospheric cir-
culation changes beyond the Loess Plateau contributed the other 62.6%. The average annual precipitation under the vegetation
restoration scenario over the Loess Plateau was 12.4% higher than that under the scenario without vegetation restoration. The
above research results have important theoretical and practical significance for the ecological protection and optimal devel-
opment of the Loess Plateau, as well as the sustainable management of vegetation restoration.