Experimental warming increased soil nitrogen sink in the Tibetan permafrost | |
Chang, Ruiying1![]() ![]() | |
刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
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2017-07-01 | |
卷号 | 122期号:7页码:1870-1879 |
关键词 | Nitrogen Isotope Permafrost Soil Cryoturbation Openness Of n Cycle Soil Aggregate Qinghai-tibetan Plateau |
ISSN号 | 2169-8953 |
DOI | 10.1002/2017JG003827 |
通讯作者 | Wang Genxu |
英文摘要 | In permafrost soil, warming regulates the nitrogen (N) cycle either by stimulating N transformation or by enhancing cryoturbation, the mixture of soil layers due to repeated freeze thaw. Here N isotopic values (N-15) of plants and the soil were investigated in a 7year warming experiment in a permafrost-affected alpine meadow on the Qinghai-Tibetan Plateau. The results revealed that warming significantly decreased the N-15 in the plant (aboveground and belowground parts) and different soil fractions (clay and silt fraction, aggregate, and bulk soil). The decreased soil N-15 was associated with an increase in soil N stock due to greater N fixation. The incremental N retention in plants and soil mineral-associated fractions from warming resulted in a decrease in soil inorganic N, which constrains the role of nitrification/denitrification in soil N-15, suggesting a restrained rather than an open N cycle. Furthermore, enhanced cryoturbation under warming, identified by a downward redistribution of Cs-137 into deeper layers, promoted N protection from transformation. Overall, the decrease in soil N-15 indicated higher rates of N input through fixation relative to N loss through nitrification and denitrification in permafrost-affected ecosystems under warming conditions. |
语种 | 英语 |
WOS记录号 | WOS:000407860500020 |
内容类型 | 期刊论文 |
源URL | [http://ir.imde.ac.cn/handle/131551/19029] ![]() |
专题 | 成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室 |
作者单位 | 1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Environm Evolvement & Regulat, Chengdu, Sichuan, Peoples R China 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China |
推荐引用方式 GB/T 7714 | Chang, Ruiying,Wang, Genxu,Yang, Yuanhe,et al. Experimental warming increased soil nitrogen sink in the Tibetan permafrost[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2017,122(7):1870-1879. |
APA | Chang, Ruiying,Wang, Genxu,Yang, Yuanhe,&Chen, Xiaopeng.(2017).Experimental warming increased soil nitrogen sink in the Tibetan permafrost.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,122(7),1870-1879. |
MLA | Chang, Ruiying,et al."Experimental warming increased soil nitrogen sink in the Tibetan permafrost".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 122.7(2017):1870-1879. |
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