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OALib Journal期刊
ISSN: 2333-9721
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杨树人工林土壤养分有效性变化及其与土壤细菌群落演变的相关性
DOI: 10.3724/SP.J.1145.2014.11026, PP. 491-498
Keywords: 连作杨树人工林,土壤养分库与流,养分有效性,细菌群落结构
Abstract:
为揭示连作人工林衰退机制，基于离子交换树脂膜埋置和pcr-dgge技术，对杨树人工林土壤养分库与流特征、土壤细菌群落结构的代际差异进行了对比分析.结果表明，随连作代数增加，杨树人工林土壤养分含量总体呈现逐渐下降的趋势；根际和非根际土壤中速效氮和钾的含量在代际间呈现显著降低（p<0.05），说明连作人工林极易出现养分亏缺.养分离子流在非根际土壤中并没有显著差异，但根际土壤中nh4+和k+在单位时间内的提取量呈现显著增加，no3-则显著减少（p<0.05），说明连作杨树人工林土壤硝化作用存在障碍.对土壤细菌群落结构的研究表明，根际土壤细菌丰富度和shannon-wiener多样性显著低于非根际土，但氨化细菌、好气性固氮菌和纤维素分解菌的数量显著高于非根际土；而且呈现出氨化细菌数量在代际间显著增加，亚硝化细菌和好气性固氮菌显著减少的趋势（p<0.05）.典型相关分析表明，杨树人工林土壤养分有效性变化与细菌群落演变具有极显著相关性（p<0.01）.因此，细菌群落演变可能是影响土壤硝化作用和氮素有效性变化的重要机制.
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