《Table 4 Value of ecosystem services per unit area in Yarkant River basin》

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《1978–2018年叶尔羌河流域土地利用及其生态服务价值变化数据研究》

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where n is the crop type.The Yarkant River basin includes Yarkant County，Poskam County，Kargilik County，Makit County，and Maralbexi County.The main crops in these areas are wheat，rice，corn，padanmu，red dates，walnuts，and beans.Pi refers to the current price of grain crops（Yuan·t-1），q refers to the per unit area yield of grain type i（t·hm-2），and m refers to the area of grain crop i（hm2）.M denotes the total area of food crops（hm2）.According to the statistical yearbook，the average economic value of V in the study area for 1978，1988，1998，2008，and 2018 is 1575.5（Yuan·hm-2·a-1）.Finally，using Equation（4），the ESV coefficients of the six land types in the Yarkant River basin can be calculated.The results are presented in Table 4.