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.
养分的有效性是由土壤物理、化学和生物学特性，特别是根系主导的根际动态过程所决定的。
The availability of mineral nutrients for plants is determined by the chemical, physical and biological characteristics of soils, especially by root-induced changes in the rhizosphere.
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