桐庐生态公益林主要森林类型土壤抗水蚀功能综合评价

Comprehensive evaluation on soil anti-water erosion function of main forest types in Tonglu’s ecological non-commercial forest

以浙江省桐庐县生态公益林定位监测站为依托,研究了该区域不同森林类型土壤的抗水蚀功能。对比无林地,各森林类型的土壤均有较好的抗水蚀功能。选取土壤初渗速率、稳渗速率、非毛管孔隙度、总孔隙度、水稳性指数、团聚度、分散率、>0.25水稳性团聚体含量、有机质含量为评价指标,以优劣解距离法为基础,构建了土壤抗水蚀功能综合评价方法。结合实测数据,对研究区各样地土壤的抗水蚀功能进行评价。结果表明:土壤抗水蚀功能为青冈林(Cyclobalanopsis glauca)>杉木林(Cunninghamia Lanceolata)>香樟林(Cinnamomum camphora)>毛竹林(Phyllostachys heterocycla)>马尾松林(Pinus massoniana)>板栗林(Castanea mollissima)>无林地;其中青冈林土壤的抗水蚀功能属较强等级,香樟林、杉木林、马尾松林、毛竹林、板栗林属中等等级,无林地属较弱等级。

Base on located ecological monitoring station of non-commercial forests in Tonglu county,Zhejiang province,soil anti-water erosion function of the different forests was studied in the region.Compared to bare land,the soil anti-water erosion function of forests was better.Soil early permeability,steady infiltration,non capillary porosity,general porosity,water-stable index,agglomerating degree,dispersion rate,〉0.25 mm water stable aggregate content,organic matter content were selected as evaluation indexes,base on distance method,constructed comprehensive evaluation method of soil anti-erosion function.Combined measured data,the soil anti-water erosion function of stands in the study area were evaluated,the result showed that： the soil anti-water erosion function in descending order was Cyclobalanopsis Oerst〉Cunninghamia Lanceolata〉Cinnamomum camphora〉Phyllostachys heterocycla〉Pinus massoniana〉Castanea mollissimabare land;the soil anti-water erosion function of Cyclobalanopsis 〉Oerst belonged to stronger grade,Cunninghamia Lanceolata,Cinnamomum camphora,Phyllostachys heterocycla and Pinus massoniana,Castanea mollissima belonged to middle grade,bare land belonged to weaker grade.