土壤生态系统中水分和养分的丰度和有效性决定土壤的肥力。
The abundance and availability of water and nutrients in a soil ecosystem determine its fertility.
水分亏缺可使土壤养分的有效性降低。
Water stress can decrease the availability of soil nutrients.
高度风化的酸性红壤，受亚热带气候及不合理利用影响，土壤养分含量偏低，尤其是土壤磷素的含量及有效性也很低。
Influenced by the subtropical climate and unreasonable use in deeply weathering red soils, the nutrient content is lower, especially the validity of phosphorus.
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