上阔下竹混交林对土壤物理性质的影响

Effects of Phyllostachys edulis and broad-leaved mixed forest on soil physical properties

以遂川县不同比例的上阔下竹混交林Ⅰ(18.6%)、Ⅱ(25%)、Ⅲ(27.5%)和毛竹纯林(Ⅳ)为研究对象,对不同深度(0～60 cm)的土壤物理性质分析。结果表明:土壤容重的排列顺序为Ⅳ(1.04 g·cm-3)<Ⅲ(1.11 g·cm-3)<Ⅱ(1.12 g·cm-3)<Ⅰ(1.13 g·cm-3),且差异显著;土壤总孔隙度大小为Ⅳ>Ⅲ>Ⅰ>Ⅱ;土壤有机质由大到小依次为Ⅲ>Ⅰ>Ⅱ>Ⅳ,土壤有机质与土壤容重存在显著负相关,与土壤总孔隙度、毛管孔隙度、非毛管孔隙度等存在显著或极显著关系;土壤最大蓄水量和蓄水深度均表现为Ⅳ>Ⅲ>Ⅱ>Ⅰ。采用TOPSIS法对不同类型毛竹林土壤物理结构综合评价,土壤物理结构优劣顺序为Ⅲ>Ⅳ>Ⅱ>Ⅰ,表明较大比例的上位阔叶林对下位毛竹纯林土壤结构有一定的改善作用。

By taking the different proportions moso bamboo and broad-leaved mixed forests [ I （18.6%）, II （25%）, III （27.5%）] and moso bamboo pure forest （ IV ） in Suichuan county as studying objectives, the soil physical properties of the forests in different depths （0 ～ 60 cm） have been analyzed. The results indicate that the order of soil bulk density from large to small was plot IV （1.04 g·cm^-3） 〈 plot III （1.1 lg·cm^-3） 〈 plot II （1.12g·cm^-3） 〈 I （1.13 g·cm^-3）, of them there were significant differences; the soil total porosity sequenced by magnitude plot IV 〉Ⅲ〉Ⅰ〉Ⅱ〉Ⅳ ; the order of soil organic matter order was plot Ⅲ〉Ⅰ〉Ⅱ〉ⅣV, which was negatively correlated with soil bulk density, but significantly or highly significant correlated with soil total porosity, capillary porosity and non-capillary porosity et al; the soil maximum water volume and water depth were in the order plot Ⅳ〉Ⅲ〉Ⅱ〉Ⅰ. Evaluating with the method of TOPSIS, the advantages and disadvantages of the soil physical structure in different types of moso bamboo forests ranked in magnitude order plot Ⅲ〉Ⅳ〉Ⅱ〉Ⅰ, which show that the upper broad-leaves forests with a significant proportion had some improvements on the soil structure of the lower moso bamboo pure forest.