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以浙江省桐庐县生态公益林定位监测站为依托,以土壤水稳性指数、团聚体特征、有机质含量为指标,研究了该区域不同林分类型土壤层的抗蚀性。结果表明:对比无林地,各生态公益林土壤均有较好的抗蚀性能,其中青冈林在表征抗蚀性的各指标上表现最好;土壤水稳性指数和有机质含量随土层厚度的增加而下降;土粒静水崩解率(S)随浸水时间(t)的变化过程呈三次多项式S=at+bt2+ct3+d函数关系;选取土壤水稳性指数、团聚度、分散率、>0.25mm水稳性团聚体含量、有机质含量为评价指标,以灰色关联分析为基础,构建了土壤抗蚀性等级评价体系,对研究区各样地土壤抗蚀性进行定性评价,结果显示青冈林土壤抗蚀性等级为较强,香樟林、杉木林、马尾松林、毛竹林、板栗林土壤抗蚀性等级为中等,无林地抗蚀性等级为较弱。
Based on the monitoring stations of ecological forests in Tonglu County, Zhejiang Province, the soil water stability index, aggregate characteristics and organic matter content were taken as indexes to study the corrosion resistance of soil layers in different forest types in this area. The results showed that compared with non-woodland, the soil of each ecological non-commercial forest had good corrosion resistance, of which Cyclobalanopsis glauca forest performed the best on all the indexes that characterize the anti-corrosion. The soil water stability index and organic matter content varied with soil thickness (S) of the soil with water immersion time (t) showed a function of the third degree polynomial S = at + bt2 + ct3 + d. Soil water stability index, aggregation degree, > 0.25mm water-stable aggregate content and organic matter content were evaluated. Based on the gray correlation analysis, the evaluation system of soil corrosion resistance was established, and the soil anti-erodibility was evaluated qualitatively in various areas of the study area. The soil anti-erodibility grades of forest were higher. The soil anti-corrosion grades of camphora, Chinese fir, Pinus massoniana, Phyllostachys pubescens, chestnut forest were medium, and the non-woodland grade was weaker.