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在美国,科学家和决策者正在积极地寻求作为长期土壤侵蚀函数的土壤生产力的估价结果.“国家土壤侵蚀与土壤生产力研究计划委员会”正式提出了这个问题,验证了
In the United States, scientists and policymakers are actively seeking estimates of soil productivity as a function of long-term soil erosion. The National Planning Commission for Soil Erosion and Soil Productivity has formally raised this issue, validating