苏木山不同林分密度华北落叶松人工林土壤水分物理特征

Physical Characteristics of Soil Moisture in Larix princiois-rupprechtii Plantation with Different Stand Densities in Sumu Mountain

为研究苏木山不同林分密度华北落叶松人工林土壤水分的物理特征,为华北落叶松人工林合理经营和生态环境的可持续健康发展提供理论依据。选择该林区5个密度林分,对不同林分密度、不同土层间的土壤物理特性进行综合比较,利用主成分分析、隶属函数和加权求和模型进行综合评价。结果表明,过低或过高的林分密度均会显著增加土壤容重,降低土壤总孔隙度、毛管孔隙度、最大持水量和田间持水量;不同林分密度土壤水分物理特性指标除非毛管孔隙度外均在土壤表层呈现显著变化;林分密度为1300株/hm^(2)时综合评价值最高,因此针对该林区的华北落叶松人工林,将林分密度控制在1300~1800株/hm^(2),将更有利于维持整个林地系统土壤水分物理特性的长期稳定性,为华北落叶松人工林维持长期生产力创造良好条件,获得更好的生态和经济效益。

In order to explore the physical characteristics of soil moisture in Larix princiois-rupprechtii plantation with different stand densities in Sumu Mountain,and provide a theoretical basis for the rational management of Larix princiois-rupprechtii plantation and the sustainable and healthy development of ecological environment,five density stands were selected to comprehensively compare the physical characteristics of soil moisture between different stand densities and different soil layers.The physical characteristics of soil moisture in different stand densities were comprehensively evaluated by principal component analysis,membership function and weighted summation model.The results showed that too low or too high stand density would significantly increase soil bulk density,reduce soil total porosity,capillary porosity,maximum water holding capacity and field water holding capacity;the physical characteristics indicators of soil moisture with different stand densities showed significant changes in the soil surface layer,except for capillary porosity;the stand with a density of 1315 plants/hm^(2) had the highest comprehensive evaluation value.Therefore,for Larix princiois-rupprechtii plantation,controlling the forest density between 1300 and 1800 plants/hm^(2) was conducive to maintaining the long-term stability of the soil moisture physical properties of the entire forest system,creating favorable conditions for maintaining long-term productivity of Larix princiois-rupprechtii plantation,and obtaining better ecological and economic benefits.