...飞冠代写网 关键词：紫色土丘陵区；水土流失；土地利用方式；土壤侵蚀模数；“长治”工程 [gap=1333]Keywords: Purple soil area; Soil and water loss; Land uses; Soil erosion modulus; “Chang zhi” project ..
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The result showed that the heavy metal pollution have existed in purple soil area, and it was most obviously at the mining areas and big city suburbs.
结果表明，紫色土区已存在重金属污染问题，尤以矿区和大城市近郊最为明显。
The problem of severe soil and water loss in the purple soil area is adverse to eco-environment construction and safety in upper reaches of the Yangtze River.
但紫色土分布区的水土流失问题较为严重，对长江上游生态环境建设和安全都有不利影响。本文论述了紫色土的侵蚀和泥沙形成流失的特点。
For example of degradation of purple soil which accounts for the largest area in this region, this paper mentions the characteristics, type and development of soil degradation in this region.
以占该区面积最大的紫色土退化为例，提出了该区土壤退化特征、类型和发生现状。
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