Study On The Variations Of Water Footprint Of Crop Production And Its Influencing Factorsin Jilin Province

Water is the source of lifeand one of the important resources to ensure social production and human survival.In the context of raising population and rapid economic development,available freshwater isfacing a decline situation.Among the water resourceconsumers,agriculture consumes the largest amount of water resources.Thus,agriculture is confronted with a more serious water shortage.In view of the current situation of water resources and the characteristics of agricultural water use,how to evaluate agricultural water efficiency and put forward reasonable measures of water resources allocation becomes particularly important.At present,most of the studies on the water footprint of crop production are calculating the crop water footprint and analyzing the spatiotemporal variations,and few studies focus on the driving factors of the crop water footprint.Taking Jilin province as the study area,this study calculated the water footprints of rice,maize and soybean production during 2000 to 2016,analyzedthe spatiotemporal characteristicsof the three crop water footprints,then used the methodsof path analysis and geographically weighted regression to analyze the driving factors of the crop water footprint in 2000 and 2016,which provideda theoretical basis of reasonable water resourcesallocation and sustainable agriculturaldevelopment.The main results of this study are as follows:（1）During the study period,the WF_green,WF_blue,WF_greyand WF of rice production in Jilin province showed fluctuating downward trends.The average WFof rice production was 1.70m³/kg during 2000 to 2016.The WF_blue,WF_greyand WF of maize production in Jilin province also showed downward trends,while the WF_greenof maizehada small variation.The average WF of maize production was 1.00m³/kg during 2000 to 2016.The WF_green,WF_greyand WF of soybean production showed fluctuating downward trends andthere was no WFblue of soybean.The average WF of soybean production was 2.25m³/kg during 2000 to 2016.（2）In 2000,the WF of rice production was higher in the west and middle of Jilin province,lower in the middle east and east.The WFs of maize production and soybean production were higher in the west and middle,lower in the middle east.In2016,the WFs of rice production,maize production and soybean production were all decreasing.The WFs of rice production and maize production were lower in the west and middle,and the WF of soybean production waslower in the middle.（3）Among the climatic factors,the accumulated temperature and precipitation in the growing season hadlargereffects on the WF of crop production,which indicatedthat temperature and precipitation played crucialroles in the crop growth.The effect of the accumulated temperature was the largest in the east,and the effect of precipitationwas negative in the west and middle,while positive in the east and middle east.Among the agricultural input factors,the agricultural machinery power had the largest impact on the WF of crop production,and the impact in the middlewas greater than that in other regions.（4）A series of measures could be adopted to optimize the WFof crop production,Firstly,agricultural production layout should beadjustedreasonably,it was suitable in the east to developforestry,andin the west and middle tomaintain soil fertility byspreading crop rotation.Secondly,the agricultural machinery power could be enhanced appropriately in the west and middle.On the premise of crop yield and quality,chemical fertilizersshould be consumed properlyandthe utilization of organic fertilizers should be increased.Finally,it was essential in the western irrigation area to put forward the reasonable irrigation schemes.