SPATIAL-TEMPORAL CHARACTERISTICS OF WATER FOOTPRINT AND IMPACT ON WATER RESOURCES OF CHINA'S CASSAVA PRODUCTION——A CASE STUDY ON GUANGXI AND GUANGDONG
Cassava is an important biofuel feedstock crop in China.It is significant to study the impact of cassava production on water resources in major cassava-producing areas(Guangxi and Guangdong)in China for cassava industry development,water resources management,and policymaking.The meteorological data from 45 meteorological stations and agricultural data in Guangxi and Guangdong from 2004 to 2020 were selected as specific samples,this paper investigated the evolving temporal-spatial water footprint(WF)of cassava production and the impact on local water resources by using water footprint theory and the exploratory spatial data analysis(ESDA)method.The results were listed as follows.During the investigation,there was a downward trend of the WF of cassava production in Guangxi and Guangdong from 2004 to 2020.There was higher cassava WFs in Guangxi than in Guangdong.The proportion of green WF was larger than that of blue WF.(2)The spatial distribution of the cassava WF in those two areas differed slightly in the normal year(2004),the dry year(2011),and the wet year(2019),with an upward trend from the southeast of Guangdong to the northwest of Guangxi.(3)The cassava WF in Guangxi and Guangdong possessed characteristics of strong spatial correlation and solid spatial aggregation.The high-high agglomeration areas(H—H)were mainly distributed in northern and central Guangxi,while the low-low agglomeration areas(L—L)were distributed primarily in the economically developed regions of Guangdong.(4)The dry year(2011)faced a relatively high water presure degree,thus Guangxi's cassava production posed a more significant impact on local water resources.Overall,cassava production and water demand in Guangxi and Guangdong changes notably over the years.The spatial difference of water-use efficiency and water consumption is significant,with prominent spatial aggregation characteristics.Therefore,it is necessary to adjust the cassava planting structure in Guangxi and Guangdong based on water resources,formulate a reasonable irrigation system in the region,and improve the matching degree between water resources and planting structure,so as to achieve the goal of promoting sustainable development of the cassava industry and alleviating local water resource pressure.
water footprintcassavaspatial-temporal characteristicswater pressure degreeGuangxi and Guangdong
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NSTL
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