The area was very dry with low rainfall because of its geographical condition.

这一地区因为地理条件，降雨量少，因此十分干燥。

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Rainfall is a key factor affecting soil erosion and nutrient cycle by runoff in low hilly red soil area.

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。

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Small rainfall events mainly benefited herb species, and the high frequency but low amount of rainfall partially explained the relatively high vegetation cover in this area.

综合考虑降水模式与不同生活型植物对小雨量降水的响应特点，高频率的小雨量降水，可能是维持本区较高植被覆盖度的重要原因。

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