基于灰色关联分析的杉木连栽林地土壤水分物理性质研究

发布时间：2018-08-28 17:31

【摘要】：选取广西杉木连栽一代林(G1)和二代林(G2)土壤的容重、孔隙度、持水量和贮水量等11个物理性质作为参评对象,利用MCE-Gray软件计算出广西杉木幼林不同栽植代数、不同土层深度土壤水分物理状况的关联度及大小排名。分析结果表明:1)G1,G2的土壤容重均随深度的增加而增加,随着栽植代数的增加,土壤容重趋于减少;2)随土层深度的增加,G1,G2的总孔隙度、毛管孔隙度、饱和持水量和毛管持水量均逐渐增加;3)杉木林在0~40 cm土层中,G2林地土壤物理性质优于G1林地,G2的土壤保水能力较G1强,但G2的涵养水源能力比G1弱;4)土壤容重对土壤水分物理状况的影响最为重要,连栽杉木人工幼林林地的水分物理状况水平排列顺序为G2(0~20cm)G2(20~40cm)G1(0~20cm)G1(20~40cm)。
[Abstract]:Eleven physical properties of soil bulk density, porosity, water holding capacity and water storage of Chinese fir forest (G1) and second generation forest (G2) in Guangxi were selected as evaluation objects. Different planting algebras of young Chinese fir forest in Guangxi were calculated by MCE-Gray software. Correlation degree and rank of soil moisture in different soil depth. The results showed that the bulk density of G _ 1 / G _ 2 increased with the increase of soil depth, and decreased with the increase of planting algebra. 2) the total porosity and capillary porosity of G _ 1 / G _ 2 increased with the increase of soil depth. The saturated water holding capacity and capillary water holding capacity increased gradually. The soil physical properties of Chinese fir forest in 0 ~ 40 cm soil layer were better than that of G _ 1 forest and G _ 2 forest soil, and the soil water retention capacity of G _ 2 forest was better than that of G _ 1 forest. However, the water conservation capacity of G2 was weaker than that of G1) the effect of soil bulk density on soil water physical status was the most important. The order of soil moisture physical status was G2 (0~20cm) G2 (20~40cm) G1 (0~20cm) G1 (20~40cm).
【作者单位】：广西林业科学研究院国家林业局中南速生材繁育实验室广西优良用材林资源培育重点实验室;广西自治区林业厅;
【基金】：广西林业科技项目(桂林科字[2014]第15号);广西林业科技项目(桂林科字[2015]第40号);广西林业科技项目(桂林科字[2014]第30号) 广西优良用材林资源培育重点实验室自主课题资助项目(14-A-02-01)
【分类号】：S714.2

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