【摘要】 土地是人类赖以生存的物质基础,土地生产力的降低对人类未来构成极大威胁。本文根据大量的试验和实测资料,从土壤养分含量、土壤结构、土壤水分三个方面分析了土地生产力随水土流失的增强而降低的原因及机理,指出了其相应于水土流失的变化规律,提出了防止土地生产力因水土流失而降低的几种措施及它们的适应性。更多还原

【Abstract】 Land is the substantial basis on which man survives. Therefore the decrease of land productivity is a great threat against man’s future. In this paper, the cause and mechanism of the decrease of land productivity with the intensification of soil erosion are analysed on three aspects of soil, nutritious contents and structure as well as moisture, according to a large number of data from experiments and measuring in the field, and the variation law of land productivity related to soil erosion have been, pointed out. Several measures against the decrease of land productivity due to soil erosion and their suitability are also put forward.更多还原