黑河调水与节水型社会建设驱动下农业-生态系统协同机制OA

To reveal the synergistic response mechanisms among agricultural development,water regulation,and ecological response in the Heihe River Basin,this study integrates multisource data from 2000-2021 to analyze the correlation between the evolution of irrigation patterns in the midstream Zhangye City and the water area of the downstream Juyan Lake.The results indicate that the expansion of water-saving irrigation area in the midstream was significant,reaching 210 600 hectares in 2020,boosting grain yield by 204.7%compared to 2000(r=0.782).However,the inefficient expansion of cultivated land after 2013 may increase the risk of land desertification.Hydrologically,the runoff variations at Yingluoxia and Zhengyixia showed significant synchrony(r=0.948),and the water discharge from Zhengyixia was highly correlated with the area of Juyan Lake(r=0.800).Under the combined effects of water transfer policies and midstream water-saving construction,the area of Juyan Lake reached a historical peak in 2017.Difference analysis revealed potential hydrological contradictions:while EVI and NDBI confirmed synchronized vegetation recovery and cultivated land expansion,NDWI revealed a general decline in surface humidity in midstream farmlands,confirming that water-saving measures have hindered the water cycle.The study concludes that synergistic management involving engineering regulation,technology promotion,and policy guidance achieves an economic-ecological win-win,laying a solid foundation for national security.