Response of soil microbial community structure to increased precipitation and nitrogen addition in a semiarid meadow steppe
Response of soil microbial community structure to increased precipitation and nitrogen addition in a semiarid meadow steppe
复制标题
半干旱草甸草原土壤微生物群落结构对降水和氮添加增加的响应
DOI：
10.1111/ejss.12441
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发表时间：
2017
影响因子：
4.2
通讯作者：
Yang Y.
中科院分区：
文献类型：
--
作者：
Sun S.;Zhao H.;Xing F.;Bai Z.;Gao Y.;Dong Y.;Zhou J.;Wu Y.;Yang Y.
氮和水的添加可能对土壤微生物群落结构产生交互作用。波动的自然降水制度对半干旱草甸草原土壤微生物群落的影响和重要性是非常多变的，鲜为人知。黄芩针茅的研究。以草甸草原为研究对象，采用磷脂脂肪酸（PLFA）分析评价了增加降水、加氮和降水制度对微生物群落结构的调节作用。试验采用完全随机区组设计，在2010 - 2012年，N的添加量分别为0、5和10 g N m−2（年−1）和高于自然降水量15%或30%的水量。额外的水分和年数对土壤微生物群落结构有交互作用。水和氮对土壤特性（如pH值）的间接影响，至少可以部分解释微生物群的变化。在干旱年，额外的水分显著降低了大多数微生物群的PLFAs，但在潮湿年没有影响。结果反映了两个水文对比年的自然降水变化。草甸草原土壤微生物群落结构的变化可能与年际降水的变化有关。总的来说，本研究强调了降水制度对土壤微生物群落结构的重要性。未来自然降水的增加将减弱氮肥对草地生态系统的负面影响。
Additions of nitrogen (N) and water might have an interactive effect on the structure of the soil microbial community. The effects and importance of a fluctuating natural precipitation regime on the soil microbial community in a semiarid meadow steppe are very variable and less well known. On a Stipa baicalensis Rosh. meadow steppe, we used phospholipid fatty acid (PLFA) analysis to evaluate the effects of increased precipitation, addition of nitrogen and precipitation regime in regulating the structure of the microbial community. The experiment had a complete randomized block design with additions of N of 0, 5 and 10 g N m−2 year−1 and of water of 15 or 30% above the natural precipitation from 2010 to 2012. Additional water and number of years had interactive effects on the soil's microbial community structure. The indirect effects of water and N on soil properties such as pH might explain, at least in part, the changes in microbial groups. Additional water significantly decreased PLFAs for most microbial groups in the dry year, but had no effect in the wet year. The results reflected fluctuation in the natural precipitation regime during two hydrologically contrasting years. Changes in the structure of the soil microbial community might depend on variation in interannual precipitation on meadow steppe. Overall, this study emphasizes the importance of the precipitation regime for the soil's microbial community structure. Increases in natural precipitation will weaken the negative effects of nitrogen fertilizers on the grassland ecosystem in future.