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(三)侵蚀和保持措施对土壤生产力的影响水蚀和风蚀引起土壤恶化是关系到未来食品供应的关键问题.虽然人们已对土壤恶化的严重性作了种种估计.
Impact of Erosion and Conservation Measures on Soil Productivity Deterioration of soil caused by water erosion and wind erosion is a key issue that affects future food supplies, although estimates of the severity of soil degradation have been made.