邢树文;李云;李金林;张银珊;

• 1:韩山师范学院食品科学工程与生物科技学院

摘要(Abstract)：

【目的】分析种植年限对蕉柑根际土壤线虫群落组成与结构特征的影响,探明不同种植年限的蕉柑根际土壤线虫群落多样性与营养类群分布差异的成因。【方法】五点采样法采取土样,浅盘法分离提取线虫,运用生态学指数和主分量分析的PCA排序相结合的方法处理数据。【结果】(1)小树龄蕉柑根际土壤线虫群落的个体密度、属数、多样性指数和丰富度指数均显著高于大树龄蕉柑样地(P<0.05)。(2)PCA排序分析表明,食真菌线虫和大多数食细菌、捕食性/杂食性线虫主要分布在小树龄蕉柑样地,植食性线虫主要分布在大树龄蕉柑样地。(3)相关性分析表明,蕉柑种植年限与土壤环境因子、线虫总密度、线虫属数、生态学指数及食细菌和食真菌线虫、捕食/杂食性线虫密度呈极显著或者显著负相关,与植食性线虫密度呈显著正相关。(4)大树龄蕉柑根际土壤线虫的PPI值和PPI/MI指数显著高于小树龄蕉柑样地(P<0.05)。WI和NCR指数表明,小树龄蕉柑样地土壤健康程度优于种植年限长的大树龄蕉柑样地,小树龄蕉柑样地土壤有机质的分解途径以细菌为主。【结论】果树种植年限的延长会改变土壤的养分与结构,从而降低蕉柑根际土壤线虫密度和群落的多样性,对蕉柑根际土壤线虫各营养类群的结构及分布产生趋向性影响。

关键词(KeyWords)： 蕉柑;根际;土壤线虫;种植年限;群落结构

Abstract:

Keywords:

基金项目(Foundation): 广东省科技厅产学研结合项目专项(2010B090400010);; “广东省特色重点学科(生物学)”建设项目

作者(Author): 邢树文;李云;李金林;张银珊;

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DOI:

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