In order to understand the relationship between soil moisture and aboveground biomass of under- story vegetation in Robinia pseudoacacia forests in Loess hilly region,20 plots were sampled,including 16 Robinia pseudoacacia Forest plots at different age and 4 abandoned field plots over 25 years.The results showed that soil moisture of all Robinia pseudoacacia forest plots was significantly lower than that of aban- doned fields and soil moisture reduced with age of trees increasing.The variation of soil moist...
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