Soil enzyme activity increases with soil fertility among the same ecological zone.

在同一生态区，土壤磷酸酶活性随肥力水平的升高而增大；

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So the soil agro-ecological system has a strong protective effect on soil fertility.

农田生态系统对土壤肥力具有较强的保护作用。

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So the soil agro-ecological system has a strong protective effect on soil fertility.

农田生态系统对土壤肥力具有较强的保护作用。

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