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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Multilevel Nitrogen Additions Alter Chemical Composition and Turnover of the Labile Fraction Soil Organic Matter via Effects on Vegetation and Microorganisms
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Multilevel Nitrogen Additions Alter Chemical Composition and Turnover of the Labile Fraction Soil Organic Matter via Effects on Vegetation and Microorganisms

机译：多级氮气添加通过对植被和微生物的影响改变了化学成分和不稳定的碎片土壤有机物质的转换

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摘要

Global nitrogen (N) deposition greatly impacts soil carbon sequestration. A 2-yr multiple N addition (0, 10, 20, 40, 80, and 160 kg N·ha~(-1)·yr~(-1)) experiment was conducted in alpine grassland to illustrate the mechanisms underlying the observed soil organic matter (SOM) dynamics on the Qinghai-Tibet Plateau (QTP). Labile fraction SOM (LF-SOM) fingerprints were characterized by pyrolysis-gas chromatography/tandem-mass spectrometry, and microbial functional genes (GeoChip 4.6) were analyzed in conjunction with LF-SOM fingerprints to decipher the responses of LF-SOM transformation to N additions. The significant correlations between LF-SOM and microbial biomass, between organic compounds in LF-SOM and compound degradation-related genes, and between LF-SOM and net ecosystem exchange implied LF-SOM were the main fraction utilized by microorganisms and the most sensitive fraction to N additions. The LF-SOM increased at the lowest N addition levels (10 and 20 kg N·ha~(-1)·yr~(-1)) and decreased at higher N addition levels (40 to 160 kg N·ha~(-1)·yr~(-1)), but the decrease of LF-SOM was weakened at 160 kg N·ha~(-1)·yr~(-1) addition. The nonlinear response of LF-SOM to N additions was due to the mass balance between plant inputs and microbial degradation. Plant-derived compounds in LF-SOM were more sensitive to N addition than microbial-derived and aromatic compounds. It is predicted that when the N deposition rate increased by 10 kg N·ha~(-1)·yr~(-1) on the QTP, carbon sequestration in the labile fraction may increase by nearly 170% compared with that under the current N deposition rate. These findings provide insight into future N deposition impacts on LF-SOM preservation on the QTP.
机译：全局氮气（N）沉积极大地影响土壤碳封存。在高山草地进行2 yr多n加（0,10,20,40,40和160kg n·ha〜（-1）·Yr〜（-1）实验，以说明所观察到的机制青藏高原（QTP）土壤有机物（SOM）动力学。不稳定分数SOM（LF-SOM）指纹图谱，其特征在于热解气体色谱/串联质谱，和微生物功能基因（GeoChip 4.6）与LF-SOM指纹一起进行分析，以破译LF-SOM变换至N的响应添加。 LF-SOM和复合劣化相关基因的有机化合物之间的LF-SOM和微生物生物量之间的显着相关性，LF-SOM与净生态系统交换之间的LF-SOM是通过微生物和最敏感的级分使用的主要部分到了另外。 LF-SOM在最低N添加水平（10和20kg N·HA〜（-1）·YR〜（-1））下增加，并且在较高的N加水平下降低（40至160kg N·HA〜（ - 1）·Yr〜（-1）），但在160 kg n·ha〜（-1）·Yr〜（-1）加法下，LF-SOM的降低减弱。 LF-SOM的非线性响应为N添加是由于植物输入和微生物降解之间的质量平衡。 LF-SOM中的植物衍生化合物比微生物衍生和芳族化合物更敏感。据预测，当QTP上的N沉积速率增加10kg n·ha〜（-1）·Yr〜（-1）时，与电流下方相比，不稳定级分中的碳封存可能会增加近170％ n沉积速率。这些发现提供了对未来的沉积影响对QTP上的LF-SOM保存的影响。

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  • 作者

    Qiuyu Chen; Bin Niu; Yilun Hu; Jian Wang; Tianzhu Lei; Xu-Ri; Jizhong Zhou; Chuanwu Xi; Gengxin Zhang;

  • 作者单位

    Key Laboratory of Alpine Ecology Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing China;

    Key Laboratory of Alpine Ecology Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing China;

    Key Laboratory of Alpine Ecology Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing China;

    Key Laboratory of Mountain Surface Processes and Ecological Regulation of Chinese Academy of Sciences Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu China;

    Key Laboratory of Petroleum Resources Research Institute of Geology and Geophysics Chinese Academy of Sciences Lanzhou China;

    Key Laboratory of Alpine Ecology Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing China;

    Department of Microbiology and Plant Biology and School of Civil Engineering and Environmental Sciences Institute for Environmental Genomics University of Oklahoma Norman OK USA;

    Department of Environmental Health Sciences School of Public Health University of Michigan Ann Arbor MI USA;

    Key Laboratory of Alpine Ecology Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物分布与生物地理学;
  • 关键词

    Multilevel Nitrogen Additions; Alter Chemical Composition; Turnover;

    机译：多级氮气补充;改变化学成分;周转;

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