温带草原生态系统土壤原核生物特征对自然水分梯度的响应

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中文摘要：土壤水分是影响生态系统功能的重要因素,其不仅可以维持微生物的活性,还可以通过改变植被多样性,控制土壤养分的扩散和运输,最终改变微生物群落.为探索土壤含水量对土壤原核生物群落的影响,本研究在中国内蒙古呼伦湖南岸的草原生态系统中建立了一个覆盖自然土壤水分梯度的研究区域,并将其细分为高含水量(4.80％±1.18％)、中含水量(2.17％±0.09％)和低含水量(1.85％±0.14％)三个梯度.环境因子是通过实地调查和实验室分析获得的.土壤原核生物是通过高通量测序技术测定的.植被特征和土壤理化性质对原核生物丰富度多样性有显著影响,其中土壤含水量是最重要的影响因素.在中含水量梯度中,差异原核生物的数量最少,且门水平原核微生物的多样性和相对丰度最高.这表明中含水量梯度下的原核生物群落的内在变异较小,整体活性较高.此外,高含水量和低含水量梯度的原核生物多样性和门水平相对丰度较低.表型预测结果表明,这两组条件下的原核微生物群落具有更强的耐受性.总之,原核生物群落对呼伦湖南岸草地生态系统的自然水分梯度有明显响应,土壤水分过高或过低都会增加原核生物的抗逆性.

外文标题：Soil prokaryotic characterization in response to natural moisture gradient in the temperate grassland ecosystems

外文摘要：Soil moisture,which is an important factor affecting ecosystem function,can maintain microbial activity and ultimately change the microbial community by altering vegetation diversity and controlling the diffusion and transport of soil nutrients.To explore the effects of soil water content(SWC)on soil prokaryotic community,we established a study area covering a natural soil moisture gradient and subdivided it into high(HW,4.80±1.18％),medium(MW,2.17±0.09％)and low water contents(LW,1.85±0.14％)in the grassland ecosystem along the south shore of Hulun Lake in Inner Mongolia,China.Environmental factors were determined by field surveys and laboratory analyses.Soil prokaryotes were determined by high-throughput sequencing techniques.Vegetation characteristics and soil physicochemical properties had a significant effect on prokaryotic richness diversity,and SWC was the most important factor influencing prokaryotic richness diversity.In the MW,the number of differential prokaryotes was lowest,and prokaryotic microorganisms had the highest diversity and relative abundance at the phylum level,which may reflect less intrinsic variation and higher overall activity of the prokaryotic community in the MW.In addition,HW and LW had lower prokaryotic diversity and relative abundance at the phylum level,and phenotypic predictions for both groups indicated a more tolerant prokaryotic community.In summary,the prokaryotic community responded significantly to the natural moisture gradients in grassland ecosystems along the south shore of Hulun Lake,and both too high and too low soil moisture increased prokaryotic stress resistance.

外文关键词：

the south shore of Hulun Laketemperate grasslandnatural soil moisture gradientsoil prokaryotic communityphenotypic prediction

作者：

Xin Chen、Yujue Wang、Yuting Shen、Weiguo Sang、Nengwen Xiao、Chunwang Xiao

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作者单位：

College of Life and Environmental Sciences,Minzu University of China,Beijing 100081,China

State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China

关键词：

呼伦湖温带草原自然土壤水分梯度土壤原核生物群落表型预测

基金：

国家自然科学基金Graduate Research and Practice Projects of Minzu University of China

项目编号：

31770501BZKY2022046

出版年：

2023

DOI：

10.1093/jpe/rtad040

植物生态学报(英文版)

CSCD

ISSN：1752-9921

年,卷(期)：2023.(6)

参考文献量49