不同林龄桉树人工林的土壤理化性质及脲酶活性

发布时间：2018-03-26 04:15

本文选题：桉树林土壤　切入点：脲酶活性　出处：《热带作物学报》2017年03期

【摘要】：为探明桉树林地土壤理化因子和土壤脲酶活性随林龄的动态变化规律,以及脲酶活性与土壤主要理化因子之间的深层关系,采用时空互代法和通径分析方法对海南儋州地区不同林龄桉树林土壤主要理化因子和脲酶活性进行了研究。结果表明:随林龄的增加,桉树林下土壤理化因子及脲酶活性大致呈现递减趋势且存在显著差异,其中2年生林地脲酶活性最高为0.901 mg/g,4年生和6年生林地土壤脲酶活性分别为0.533 mg/g和0.499 mg/g。通过进一步的相关分析和通径分析发现,土壤各因子对脲酶活性影响(按绝对值大小)的大小顺序为:全磷(0.719)水溶性有机氮(0.519)全氮(0.508)土壤含水量(0.463)总有机碳(0.170)土壤容重(0.154)水溶性有机碳(0.143)。综合各因子的直接作用和间接作用得出,土壤全氮以及水溶性有机氮(WSON)是制约脲酶活性的直接相关因子,而水溶性有机碳(WSOC)通过强烈的间接效应也对脲酶活性产生重要影响。
[Abstract]:In order to find out the dynamic changes of soil physical and chemical factors and soil urease activity with forest age, and the deep relationship between urease activity and soil main physical and chemical factors in eucalyptus forest land. The main physical and chemical factors and urease activity of eucalyptus soil at different forest ages in Danzhou area of Hainan Province were studied by means of space-time intergenerational method and path analysis. The results showed that the soil urease activity increased with the increase of forest age. The soil physical and chemical factors and urease activity under eucalyptus forest showed a decreasing trend, and there were significant differences in soil physical and chemical factors and urease activity. The highest urease activity was 0.901 mg / g in 2-year-old forest land, 0.533 mg/g in 4-year-old and 0.499 mg / g in 6-year-old forest land, respectively. Further correlation analysis and path analysis showed that the urease activity of 2-year-old woodland was 0.533 mg / g, and that of 4-year-old and 6-year old forest soil was 0.499 mg / g, respectively. The effects of soil factors on urease activity (in the order of absolute value) were: total phosphorus 0.719) water-soluble organic nitrogen (0.519)) total nitrogen (0.508)) soil water content (0.463)) total organic carbon (0.170)) soil bulk density (0.154)) water-soluble organic carbon (0.143). Grafting and indirect action, Soil total nitrogen and water-soluble organic nitrogen (WSON) are the direct related factors which restrict the urease activity, and the water-soluble organic carbon (WSOC) also exerts an important influence on the urease activity through the strong indirect effect.
【作者单位】：海南大学热带农林学院;
【基金】：中国科学院战略性先导科技专项子课题(No.XDA05050208-5,XDA05050206,XDA05050302-2)
【分类号】：S792.39;S714

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