Seasonal changes in and relationship between soil microbial and microfaunal communities in a Tamarix chinensis community in the Yellow River Delta
Seasonal changes in and relationship between soil microbial and microfaunal communities in a Tamarix chinensis community in the Yellow River Delta
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DOI：
10.5897/ajb11.1911
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发表时间：
2011-12-14
影响因子：
--
通讯作者：
Chai, Minwei
中科院分区：
文献类型：
--
作者：
Cao, Di;Shi, Fuchen;Chai, Minwei
柽柳（Tamarix chinensis）是沿着黄河三角洲海岸分布的高盐土壤植物。作为当地的优势盐生植物，它在改善当地土壤微环境方面发挥着独特的作用。我们研究了T.植被覆盖度和季节变化对黄河三角洲土壤微生物和微型动物群落的影响。2010年4月、6月和10月，在黄河某河口采集土壤样品。我们测量了微生物量（使用土壤氯仿熏蒸提取法），基质诱导呼吸（SIR），和磷脂脂肪酸（PLFA）。微生物群落结构和土壤线虫物种丰富度具有明显的季节变化。土壤微生物生物量碳（SMBC）、微生物生物量氮（SMBN）和SIR含量在4月份低于10月份。中国遗址6月，土壤PLFA总丰度和土壤线虫多样性略有增加。中国遗址逐步回归分析表明，植食性线虫是影响土壤微生物群落组成变化的主导因素，土壤水分、土壤有机碳和植食性线虫能力是次要因素。土壤微生物群落组成的季节性变化可能与线虫营养类群、土壤水分和土壤有机碳的变化有关。
The plant Tamarix chinensis is distributed along the coast of the Yellow River Delta in soils with high salinity. As the dominant local halophyte, it plays a unique role in modifying the local soil microenvironment. We investigated the effects of T. chinensis vegetative cover and the seasons on the soil microbe and microfauna communities in the Yellow River Delta. In April, June and October 2010, soil samples were taken from an estuary of the Yellow River. We measured microbiomass (using the soil chloroform fumigation extraction method), substrate induced respiration (SIR), and phospholipid fatty acids (PLFA). Microbe community structure and soil nematode species richness exhibited distinct seasonal variation. The levels of PLFAs, soil microbial biomass carbon (SMBC), microbial biomass nitrogen (SMBN) and SIR were lower in April than in October in T. chinensis sites. In June, there was a slight increase in the total abundance of PLFA and soil nematode diversity in T. chinensis sites. Stepwise regression analysis indicated that plant-feeding nematodes were a dominant factor for changes in soil microbial community composition, and soil moisture, soil organic carbon and fungal-feeding nematode capacity were secondary factors. The distinct seasonal changes in the soil microbe community composition were likely driven by changes in nematode trophic groups, soil moisture and soil organic carbon.