西双版纳几种人工林土壤通透性能研究

Study on Soil Aeration and Permeability of Plantation in Xishuangbanna

本研究从土壤容重、土壤总孔穴度、土壤毛管孔穴度、土壤非毛管孔穴度等项目入手，研究了西双版纳定植５～７年的山桂花、西南桦、马尖相思、高阿丁枫、西南桦×山桂花、西南桦×马尖相思、西南桦×肉桂、高阿丁枫×马尖相思、高阿丁枫×西南桦９种人工林土壤的通透性能。经连续５～９年定点观测，结果表明，山桂花等９种人工林的土壤通透性能，与天然林相近。山桂花、西南桦、马尖相思、高阿丁枫４种人工纯林０ｃｍ～３０ｃｍ土层的土壤通透性能的变化规律大致是定植初期变化平稳，进入生长旺期（定植后３～７年）通透性能普遍变差，以后又逐渐得以改善。因此，定植年限较长的人工林的土壤通透性能一般比定植年限较短的人工林的土壤通透性能较好。

Soil aeration and permeability of 9 kinds of plantation in Xishuangbanna (Paramichelia baillonii, Betula alnoides Buch-Ham, Acacia mangium, Altingia excelsa, Betula alnoides Buch-Ham×Paramichelia baillonii, Betula alnoides Buch-Ham×Acacia mangium, Betula alnoides Buch-Ham×Cinnamomum cassia Presl, Altingia excelsa×Acacia mangium, Altingia excelsa×Betula alnoides Buch-Ham) of 5～7 years were studied from concerned indexes including volume weight of soil, total porosity, capillary porosity and non-capillary porosity of soil The results of spot observation of 5～9 years indicated that the soil aeration and permeability of these 9 kinds of plantation were similar to that of natural forests To the soil aeration and permeability of Paramichelia baillonii, Betula alnoides Buch-Ham,Acacia mangium, Altingia excelsa,those of initial stage of field planting were stable, and decreased after entering vigorous growth period, afterwards increased gradually As a result, in Xishuangbanna, the soil aeration and permeability of plantation with long fix planting period are better than those of plantation with short fix planting period