低丘红壤资源调查。
随着植被的逆向演替，土壤养分减少，导致低丘红壤生态系统恶化。
With the degeneration of vegetation, decreasing of soil nutrients results in regressive successions in red earth ecosystem.
降雨是影响低丘红壤坡地土壤侵蚀和养分随径流迁移的一个关键因子。
Rainfall is a key factor affecting soil erosion and nutrient cycle by runoff in low hilly red soil area.
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