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首页> 外文期刊>Ecological research >Changes in soil heterotrophic respiration, carbon availability, and microbial function in seven forests along a climate gradient
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Changes in soil heterotrophic respiration, carbon availability, and microbial function in seven forests along a climate gradient

机译：沿着气候梯度，七种森林的土壤异养呼吸，碳利用率和微生物功能的变化

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摘要

Soil microbial communities play an essential role in soil carbon (C) emission and C sequestration in forest ecosystems. However, little information is available regarding the relationship between soil C dynamics and microbial substrate utilization at large scales. Along the North-South Transect of Eastern China (NSTEC), seven forests representative of boreal, temperate and tropical biomes were examined. Soil heterotrophic respiration (R_h), soil dissolved organic C (DOC), microbial biomass C (MBC), and microbial community-level physiological profiles (CLPPs) were investigated using biochemical measurements, static chamber-gas chroma-tography analysis, and Biolog-Eco microplates, respectively. We found that soil R_h rates were significantly higher in subtropical and boreal forests than in temperate forests. Conversely, the concentrations of soil DOC and MBC, as well as microbial metabolic activity and functional diversity, were consistently higher in temperate forests than in subtropical forests. There were considerably different substrate utilization profiles among the boreal, temperate, and subtropical forests. Soil microorganisms from the temperate and boreal forests mainly metabolized high-energy substrates, while those from the subtropical forests used all substrates equally. In addition, soil R_h rates were significantly and negatively related to soil labile C concentrations, total metabolic activity, and the intensity of individual substrate utilization, indicating that soil microbes assimilated more soil substrates, thereby reducing CO_2 emissions. Overall, our study suggests that climate fac- tors, as well as substrate availability, dominate the activities and functions of soil microbes at large scales.
机译：在森林生态系统中，土壤微生物群落在土壤碳（C）排放和碳固存中起着至关重要的作用。但是，关于土壤碳动力学与微生物底物利用之间的关系的信息很少。沿着中国东部的南北样带（NSTEC），研究了代表北方，温带和热带生物群落的七个森林。使用生化测量，静态室气相色谱分析和Biolog-S对土壤异养呼吸（R_h），土壤可溶性有机碳（DOC），微生物生物量C（MBC）和微生物群落水平的生理特征（CLPPs）进行了研究生态微孔板，分别。我们发现，亚热带和北方森林的土壤R_h率显着高于温带森林。相反，温带森林中的土壤DOC和MBC浓度以及微生物的代谢活性和功能多样性始终高于亚热带森林。在北方，温带和亚热带森林中，底材的利用情况差异很大。来自温带和北方森林的土壤微生物主要代谢高能基质，而来自亚热带森林的土壤微生物均等地使用所有基质。此外，土壤R_h速率与土壤中不稳定的C浓度，总代谢活性和单个底物利用的强度显着负相关，表明土壤微生物吸收了更多的土壤底物，从而减少了CO_2的排放。总体而言，我们的研究表明，气候因素以及基质的可利用性在很大程度上控制着土壤微生物的活动和功能。

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  • 来源
    《Ecological research》 |2014年第6期|1077-1086|共10页
  • 作者

    Huajun Fang; Shulan Cheng; Yongsheng Wang; Guirui Yu; Minjie Xu; Xusheng Dang; Linsen Li; Lei Wang;

  • 作者单位

    Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;

    University of Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, Beijing 100049, China;

    Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;

    Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;

    University of Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, Beijing 100049, China;

    Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;

    University of Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, Beijing 100049, China;

    Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;

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  • 正文语种 eng
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  • 关键词

    Soil heterotrophic respiration; Labile carbon concentration; Microbial substrate utilization; Functional diversity; Forest biomes;

    机译：土壤异养呼吸;不稳定的碳浓度;微生物底物利用率;功能多样性;森林生物群落;

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