桉树与格木混交初期土壤理化性质的变化

发布时间：2018-11-11 20:49

【摘要】：以2年生桉树人工林及桉树、格木混交林为对象,对其造林初期林地土壤理化性质的变化进行研究,探讨其土壤理化性质、土壤酶活性与土壤酚类物质间的关系。结果表明:(1)两种林分根区土壤pH值较小,0—20cm土壤pH值大于20—40cm,混交林林间0—20cm土壤自然含水率、容重、最大持水量、总孔隙度、通气度均较桉树纯林大;对林间20—40cm土层而言,桉树×格木混交林容重、总孔隙度、通气度、排水能力均比桉树纯林大,自然含水率、最大持水量相反。(2)混交林林间0—20cm土壤脲酶活性最大,为1.46mg/(g·h),脲酶、磷酸酶及多酚氧化酶活性均表现为桉树根区大于格木根区,且较桉树纯林桉树根区大。(3)桉树纯林根区总酚、复合酚含量最大,混交林林间0—20cm水溶酚含量最大,土壤水溶酚含量范围为0.62~2.04μg/g。桉树纯林造林初期土壤中酚类物质含量较低,未造成土壤酚类物质的积累;桉树与格木混交初期能改善土壤理化性质,提高土壤酶活性;土壤理化性质、土壤酶活性与酚酸物质含量间存在着一定的相关性。
[Abstract]:The changes of soil physical and chemical properties of 2-year old eucalyptus plantation, eucalyptus and mixed plantations were studied, and the relationship between soil physical and chemical properties, soil enzyme activity and soil phenolic substances was discussed. The results were as follows: (1) the pH value of soil in the root zone of the two forests was small, the pH value of 0-20cm soil was more than 20-40 cm, and the natural moisture content, bulk density, maximum water holding capacity, total porosity and aeration of 0-20cm in mixed forest were larger than those in pure eucalyptus forest; For 20-40cm soil layer, the bulk density, total porosity, aeration and drainage capacity of eucalyptus 脳 lattice mixed forest were higher than those of pure eucalyptus forest, and the natural moisture content and maximum water holding capacity were opposite. (2) the urease activity of 0-20cm soil in mixed forest was the highest. The activities of 1.46mg/ (g h), urease, phosphatase and polyphenol oxidase showed that the root area of eucalyptus was larger than that of the root area of eucalyptus, and it was larger than that of pure eucalyptus forest. (3) the total phenol and the content of compound phenol were the highest in the pure forest of eucalyptus. The water soluble phenol content of 0-20cm in mixed forest was the highest, and the range of soil water soluble phenol was 0.62 ~ 2.04 渭 g / g. The content of phenols in the soil of pure eucalyptus forest was low in the early stage of afforestation, which did not cause the accumulation of phenolic substances in the soil, and the physical and chemical properties of soil and the activity of soil enzyme were improved in the early stage of mixed eucalyptus and grid trees. There was a certain correlation between soil physical and chemical properties, soil enzyme activity and phenolic acid content.
【作者单位】：广西国有高峰林场;广西林业科学研究院;广西大学林学院;
【基金】：国家自然科学基金(31260176) 广西自然科学基金(2015GXNSFAA139081)
【分类号】：S714.2

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