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Effects of continuous cucumber cropping and alternative rotations under protected cultivation on soil microbial community diversity

机译：设施栽培条件下黄瓜连作和轮作对土壤微生物群落多样性的影响。

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摘要

The diversity of soil microbial communities as affected by continuous cucumber cropping and alternative rotations under protected cultivation were evaluated using community level physiological profiles (CLPP) and random amplified polymorphic DNA (RAPD) analysis. The soils were selected from six cucumber cropping systems, which cover two cropping practices (rotation and continuous cropping) and a wide spectrum for cucumber cropping history under protected cultivation. Shannon–Weaver index and multivariate analysis were performed to characterize variations in soil microbial communities. Both CLPP and RAPD techniques demonstrated that cropping systems and plastic-greenhouse cultivation could considerably affect soil microbial functional diversity and DNA sequence diversity. The open-field soil had the highest Shannon–Weaver index (3.27 for CLPP and 1.50 for RAPD), whereas the lowest value occurred in the 7-year continuous protected cultivation soil (3.27 for CLPP and 1.50 for RAPD). The results demonstrated that continuous plastic-greenhouse cultivation and management can cause the reduction in the species diversity of the biota. Higher Shannon–Weaver index and coefficients of DNA sequence similarity were found in soils under rotation than those under continuous cropping. Cluster analysis also indicated that microbial community profiles of continuous cultivation soils were different from profiles of rotation soils. The reduction in diversity of microbial communities found in continuous cultivation soils as compared with rotation soils might be due to the differences in the quantity, quality and distribution of soil organic matter.
机译：使用群落水平生理概况（CLPP）和随机扩增多态性DNA（RAPD）分析，评估了黄瓜连续种植和轮作后轮作对土壤微生物群落多样性的影响。从六个黄瓜种植系统中选择了土壤，这些系统涵盖了两种种植方式（轮作和连续种植），而且在受保护的耕作条件下，黄瓜的种植历史也很广。进行了香农-韦弗指数和多元分析，以表征土壤微生物群落的变化。 CLPP和RAPD技术均表明，种植系统和塑料温室栽培都可能极大地影响土壤微生物功能多样性和DNA序列多样性。旷野土壤具有最高的香农-韦弗指数（CLPP为3.27，RAPD为1.50），而最低值发生在7年连续保护性耕作土壤中（CLPP为3.27，RAPD为1.50）。结果表明，连续的塑料温室栽培和管理可导致生物群物种多样性的降低。在轮作土壤中，与连续种植相比，Shannon-Weaver指数和DNA序列相似系数更高。聚类分析还表明，连续耕作土壤的微生物群落特征与轮作土壤的特征不同。与轮作土壤相比，连续耕作土壤中微生物群落多样性的降低可能是由于土壤有机质的数量，质量和分布的差异。

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