土壤环境容量是输入土壤生态系统污染物的最大允许负荷，此时该系统仍保持正常的结构和功能。
Soil environmental capacity is the maximum tolerable amount of pollutants inputed into a soil ecosystem, which still maintains its normal structure and functions.
环境容量是指在特定的区域内，环境单元所允许承纳的污染物的最大量，是一种重要的环境资源。
The environmental capacity is referred to the maximum value of pollutant accommodated by environmental unit in the designated area, and it is an important environmental resource.
排污权交易制度是指赋于环境容量资源价值，确定产权，并允许产权自由转让交易的制度。
The pollutant discharge right transference system is a system in which the resource value is given to environmental quantity, the property right is determined and is permitted to transfer.
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