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经多年观测 ,川中丘陵区桤柏混交林不同部位土壤的水分年变化不大 ,坡顶的无明显规律 ,坡腰大致呈单峰型变化 ,与年降雨过程有一定的同步性。林地的不同土壤层次间 ,坡顶的土壤水分年变化基本一致 ,而坡腰的则较复杂。林地土壤水分年变化与年降雨过程 ,总体上无明显的定量关系 ,只是坡腰的显示出一定的峰型模型关系。林区小流域单位雨量的径流模数随年时增加 (森林生长 ) ,无减小趋势 ,即桤柏混交林的调蓄能力并未持续增长
After years of observation, there was not much change in soil water content in different parts of the mixed plantation in the Hilly and Astragalus mixed forest in the hilly area of central Sichuan Basin. There was no obvious regularity in the top of the slope, and the pomegranate slope showed a roughly monomodal variation with some synchrony with the annual rainfall. In different forest layers, the annual variation of soil moisture in the top of the hill is basically the same, while the slope is more complicated. There is no obvious quantitative relationship between the annual variation of soil moisture and the annual rainfall in the forestland, but the relationship between the peak shape and the slope is shown on the plinth. The runoff modulus of rainfall in small watershed in forest area increased with the increase of years (forest growth), but did not decrease, that is to say, the regulation and storage capacity of mixed plantation did not increase