Background Agricultural irrigation is an important practice to safeguard crops against drought and enhance grain yield in arid regions.The Hexi Corridor,known as a classic arid region,faces signifcant pressure on agri...Background Agricultural irrigation is an important practice to safeguard crops against drought and enhance grain yield in arid regions.The Hexi Corridor,known as a classic arid region,faces signifcant pressure on agricultural production and food security due to the scarcity of water resources.There is an urgent need to investigate agricultural water use of the irrigated regions.Water use efciency(WUE),defned as the ratio of gross primary productivity(GPP)to actual evapotranspiration(ET),serves as a valuable indicator linking carbon assimilation and water loss.It enables the quantifcation of areas where water can be utilized more efectively.However,the long-term spatiotemporal dynamics of WUE and driving mechanism in the irrigated areas of the Hexi Corridor remain unclear.Results This study used GPP calculated by a light use efciency model(EF-LUE),ET estimated by an ETMonitor model and irrigated cropland maps across China(IrriMap_CN)to examine the spatiotemporal dynamics of irrigated cropland WUE and its controlling factors in the Hexi Corridor from 2001 to 2018.The results are as following:(1)The average annual WUE was approximately 1.34±0.38 g C kg^(−1) H_(2)O yr^(−1),with an increasing trend of 0.012 g C kg^(−1) H_(2)O yr^(−1),and faster growth observed during 2011–2018 compared to 2001–2010.(2)The contribution of GPP to WUE trends and WUE interannual variability(IAV)was greater than that of ET.(3)The dominant climatic factors of WUE IAV in the Hexi Corridor were SPEI,precipitation,and soil moisture.(4)The standardized Structural Equation Model(SEM),incorporating the relationship between WUE and factors such as water,energy,NDVI,and water-saving irrigation,explained 81%of the variation in irrigated cropland WUE.Here,biological factors(GPP and NDVI)were the primary factors infuencing WUE variability,and water-saving irrigation had a stronger indirect efect than climate factors(water and energy)on variation in WUE.Conclusions Our fndings ofer valuable theoretical insights into the mechanisms governing the interaction between the carbon and water of irrigated cropland,guiding the management of water resources and land in agricultural practices within the Hexi Corridor.展开更多
基金supported by the National Key Research and Development Program of China(2021YFD190070406)the Key Research and Development Program of Gansu Province(20YF8NA107)Agricultural Science and Technology Special Project of Gansu Province(GNKJ-2021–32)
文摘Background Agricultural irrigation is an important practice to safeguard crops against drought and enhance grain yield in arid regions.The Hexi Corridor,known as a classic arid region,faces signifcant pressure on agricultural production and food security due to the scarcity of water resources.There is an urgent need to investigate agricultural water use of the irrigated regions.Water use efciency(WUE),defned as the ratio of gross primary productivity(GPP)to actual evapotranspiration(ET),serves as a valuable indicator linking carbon assimilation and water loss.It enables the quantifcation of areas where water can be utilized more efectively.However,the long-term spatiotemporal dynamics of WUE and driving mechanism in the irrigated areas of the Hexi Corridor remain unclear.Results This study used GPP calculated by a light use efciency model(EF-LUE),ET estimated by an ETMonitor model and irrigated cropland maps across China(IrriMap_CN)to examine the spatiotemporal dynamics of irrigated cropland WUE and its controlling factors in the Hexi Corridor from 2001 to 2018.The results are as following:(1)The average annual WUE was approximately 1.34±0.38 g C kg^(−1) H_(2)O yr^(−1),with an increasing trend of 0.012 g C kg^(−1) H_(2)O yr^(−1),and faster growth observed during 2011–2018 compared to 2001–2010.(2)The contribution of GPP to WUE trends and WUE interannual variability(IAV)was greater than that of ET.(3)The dominant climatic factors of WUE IAV in the Hexi Corridor were SPEI,precipitation,and soil moisture.(4)The standardized Structural Equation Model(SEM),incorporating the relationship between WUE and factors such as water,energy,NDVI,and water-saving irrigation,explained 81%of the variation in irrigated cropland WUE.Here,biological factors(GPP and NDVI)were the primary factors infuencing WUE variability,and water-saving irrigation had a stronger indirect efect than climate factors(water and energy)on variation in WUE.Conclusions Our fndings ofer valuable theoretical insights into the mechanisms governing the interaction between the carbon and water of irrigated cropland,guiding the management of water resources and land in agricultural practices within the Hexi Corridor.
