山地常绿落叶阔叶混交林更新方式对林地肥力的影响

为了解鄂西南山地常绿落叶阔叶混交林采伐迹地不同更新方式对林地土壤肥力的影响,采用典型样地法对木林子自然保护区山地常绿落叶阔叶混交林迹地3种更新方式林分的土壤进行了采样分析。结果表明:土壤容重表现出人工更新>人工促进天然更新>天然更新。土壤总孔隙度和毛管孔隙度差别不大,非毛管孔隙度人工更新林地较高。土壤自然含水量、最大持水量、毛管持水量、田间持水量等水分因子以及土壤有机质、全氮、水解氮、速效磷、速效钾和pH值等化学性质均表现出人工更新<人工促进天然更新<天然更新。3种更新方式土壤理化性质差异较大,林地土壤肥力表现出人工更新<人工促进天然更新<天然更新。

Effects on Regeneration Pattern for Woodland Fertility of Mixed Evergreen and Deciduous Broadleaved Mountain Forests

The soil physicochemical characteristics in different logged areas of three regeneration patterns of mixed evergreen and deciduous broadleaved mountain forests in southwest Hubei Province in the mulinzi nature reserve were investigated and analyzed by means of typical sample plot method in order to understand influence of different regeneration pattern on soil fertility.The results showed that soil bulk density,artificial regenerationartificial measures promoting regenerationnatural regeneration;soil total porosity and capillary porosity had no marked difference,non-capillary porosity was higher in the artificial regeneration forest land;soil nature water content,maximum moisture capacity,capillary water holding,field capacity and organic matter,total N,hydrolytic N,available P,available K,pH-values all appeared artificial regenerationartificial measures promoting regenerationnatural regeneration;Soil physicochemical characteristics of three regeneration patterns appeared apparent difference,soil fertility appeared artificial regenerationartificial measures promoting regenerationnatural regeneration.