中国生态农业学报（中英文）2023，Vol.31Issue(4)：598-607,10.DOI:10.12357/cjea.20220121
白洋淀流域蒸散发增加的驱动因素
Drivers of evapotranspiration increase in the Baiyangdian Catchment
摘要
Abstract
The Baiyangdian Catchment is facing a growing shortage of water resources. Identifying the sensitive drivers of evapotran-spiration (ET) changes from land and crop management will be critical to understanding the reasons for mountainous runoff reduc-tion and depletion of groundwater resources in the plain. It will also be important for making Xiong'an become a Future Example City for green and sustainable development. In this study, remotely sensed ET data from PML V2 products with a spatial resolution of 500 m was used to analyze the trend of ET at the pixel level and to understand its influence on vegetation such as GPP (Gross Primary Production) and NDVI (Normalized Difference Vegetation Index) under different land-use types for 2002?2018. Results showed that there was a significant increase in ET in mountain regions and a slight increase in plain regions of the catchment. The spatial pattern of mean annual ET was very much relevant to the changing trend of GPP and NDVI. For the whole catchment, the average increases of ET, GPP, and NDVI were respectively 2.4 mm?a?1, 9.8 g?cm?2?a?1, and 0.0021 at an annual rate. In the mountainous region, changes in annual precipitation and vegetation recovery together caused a total increase of ET by 56.5 mm over the period and negatively af-fected the runoff. In the plain region, there were 3 factors influencing the change of ET. While intensification of urbanization and re-duction in the cultivation of wheat, the water consumptive crop, had both resulted in the decrease of ET and water consumption, ET or water consumption in most irrigated fields increased. Since the beneficial effects from urbanization and crop adjustment were not enough to offset the increase of ET in irrigated fields, an overall ET increase of 6.4 mm over the period was found. In conclusion, both in the mountainous and plain regions, ET increased. And therefore, more efforts are needed to control the ET increase in natural vegetation and cropland for a green and sustainable catchment.关键词
蒸散发/植被变化/城市化/冬小麦/灌区/白洋淀流域Key words
Evapotranspiration/Vegetation change/Urbanization/Winter wheat/Irrigated land/Baiyangdian Catchment分类
天文与地球科学引用本文复制引用
Christine Mushimiyimana,刘林林,杨永辉,李会龙,王林娜,盛祝平,Auguste Cesar Itangishaka..白洋淀流域蒸散发增加的驱动因素[J].中国生态农业学报（中英文）,2023,31(4):598-607,10.基金项目
This study was financially supported by the Project from the Ministry of Science&Technology of China(2018YFE0110100)and the National Natur-al Science Foundation of China(42171046). （2018YFE0110100）
