Drought Resistance of Vegetation and Its Change Characteristics before and after the Implementation of the Grain for Green Program on the Loess Plateau, China

Drought affects the growth and productivity of vegetation, analysis drought resistance vegetation can help ecological environmental protection sustainable development in drought-prone areas. The Loess Plateau (LP) is a area China with an extremely fragile environment. This study analyzed across different climate regions biotypes, explored characteristics changes before after implementation Grain for Green Program (GGP), evaluated relative contribution climatic factors human activities to change vegetation. following conclusions are obtained. (1) on LP basically showed spatial pattern increasing from northwest southeast degree aridity. semi-humid arid strongest weakest resistance, respectively. (2) mainly trend since GGP was implemented, but there were differences zones. In regions, weakening trend, while semi-arid it trend. There between biotypes as well; forest grassland zones, that crops all zones cropland returned, tended increase where turned forests, (3) positive leads enhancement most areas LP, dominated by negative change. main reason decrease returning grassland. provide reference high-quality LP.