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研究喀斯特山地两种母岩发育土壤上生长的人工杜仲林枯落物和土壤的持水特性。结果表明:杜仲林枯落物吸水速度快、持水量大。浸泡10小时的时候(吸水接近饱和时),白云质石灰岩和泥质灰岩发育的土壤上生长的杜仲林枯落物持水量分别是3144 4g kg-1和2830 0g kg-1,是其自身重量的314 4%和283%。土壤容重分别为1 14g cm-3、1 27g cm-3;最大持水量为43 66%、38 38%;毛管持水量为29 60%、24 83%;田间持水量为12 70%、20 92%。因此,杜仲不仅是一个用途广泛的优良经济林树种,而且也是公益林建设中营造水土保持林的优良树种。另外,就枯落物和土壤特性而言,白云质石灰岩发育的土壤上生长的人工杜仲林持水能力比泥质灰岩发育的土壤上生长的人工杜仲林强。
To study the water retention characteristics of litter and soil of artificial Eucommia ulmoides forests grown on two parent rock development karst mountains. The results showed that the litter of Eucommia ulmoides forest had faster water absorption and larger water holding capacity. When soaked for 10 hours (when water absorption is nearly saturated), the water holding capacity of the litter of Eucommia ulmoides growing on soils with dolomitic limestone and argillaceous limestone was 3144 4g kg -1 and 2830 0g kg -1, respectively 314 4% and 283% of the weight. The soil bulk density was 1 14g cm-3 and 1 27g cm-3 respectively. The maximum water holding capacity was 43 66% and 38 38%. The capillary water holding capacity was 29 60% and 24 83% respectively. The field water holding capacity was 12 70% and 20 92 %. Therefore, Eucommia ulmoides is not only a kind of excellent economic forest tree with a wide range of uses, but also an excellent tree species to create water and soil conservation forest in the construction of public welfare forest. In addition, in terms of litter and soil properties, artificial Eucommia ulmoides forests grown on dolomitic limestone soil had stronger water holding capacity than artificial Eucommia ulmoides grown on soils developed from argillaceous limestone.