《Table 1 TESVs per unit area ($/ha per year based on the 2016 value of the USD) (after Costanza et a

《Table 1 TESVs per unit area ($/ha per year based on the 2016 value of the USD) (after Costanza et a   提示:宽带有限、当前游客访问压缩模式
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《1992-2015年全球耕地变化对陆地生态系统服务价值的影响(英文)》


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According to the assessment model proposed by Costanza et al.(1997),the biosphere was divided into 16 ecosystems and 17 services types.Combined with land-use maps,we grouped the ecosystems into seven types:cropland,tropical forest,temperate/boreal forest,grassland,wetland,bare land and urban areas.Wetland owns the highest value among the seven types,followed by tropical forest,temperate forest,grassland and cropland.In this assessment model,bare land and urban areas have no value(Table 1).The total value of terrestrial ecosystems can be calculated as: