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DOI10.1029/2019JG005316
Multilevel Nitrogen Additions Alter Chemical Composition and Turnover of the Labile Fraction Soil Organic Matter via Effects on Vegetation and Microorganisms
Chen, Qiuyu; Niu, Bin; Hu, Yilun; Wang, Jian; Lei, Tianzhu; Xu-Ri; Zhou, Jizhong; Xi, Chuanwu; Zhang, Gengxin
通讯作者Zhang, GX (通讯作者)
发表日期2020
ISSN2169-8953
EISSN2169-8961
卷号125期号:4
英文摘要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.
关键词ALPINE MEADOW SOILCOMMUNITY COMPOSITIONMICROBIAL COMMUNITYFERTILIZATION DECREASESMASS-SPECTROMETRYTIBETAN PLATEAUPYROLYSIS-GC/MSCARBONDEPOSITIONPLANT
语种英语
WOS研究方向Environmental Sciences & Ecology ; Geology
WOS类目Environmental Sciences ; Geosciences, Multidisciplinary
WOS记录号WOS:000535659000010
来源期刊JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
来源机构中国科学院青藏高原研究所
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/260034
推荐引用方式
GB/T 7714
Chen, Qiuyu,Niu, Bin,Hu, Yilun,et al. Multilevel Nitrogen Additions Alter Chemical Composition and Turnover of the Labile Fraction Soil Organic Matter via Effects on Vegetation and Microorganisms[J]. 中国科学院青藏高原研究所,2020,125(4).
APA Chen, Qiuyu.,Niu, Bin.,Hu, Yilun.,Wang, Jian.,Lei, Tianzhu.,...&Zhang, Gengxin.(2020).Multilevel Nitrogen Additions Alter Chemical Composition and Turnover of the Labile Fraction Soil Organic Matter via Effects on Vegetation and Microorganisms.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,125(4).
MLA Chen, Qiuyu,et al."Multilevel Nitrogen Additions Alter Chemical Composition and Turnover of the Labile Fraction Soil Organic Matter via Effects on Vegetation and Microorganisms".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 125.4(2020).
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