Permafrost and land cover as controlling factors for light fraction organic matter on the southern Qinghai-Tibetan plateau | |
Wu, Xiaodong2; Zhao, Lin2; Hu, Guojie2; Liu, Guimin3; Li, Wangping1; Ding, Yongjian2,4 | |
刊名 | SCIENCE OF THE TOTAL ENVIRONMENT |
2018-02 | |
卷号 | 613页码:1165-1174 |
关键词 | Soil organic carbon Total nitrogen Global warming Soil texture C: N ratios |
ISSN号 | 0048-9697 |
DOI | 10.1016/j.scitotenv.2017.09.052 |
英文摘要 | Permafrost degradation can stimulate the decomposition of organic soil matter and cause a large amount of greenhouse gas emissions into the atmosphere. The light fraction organic matter (LFOM) is a labile substrate for microbial decomposition and probably plays an important role in future permafrost carbon cycles. However, little is known about the distribution of LFOM and its relationship with permafrost and environmental factors. Here, we investigated the light fraction carbon (LFC) and nitrogen (LFN) contents and stocks under meadows and wet meadows with different permafrost conditions on the southern Qinghai-Tibetan Plateau. Our results showed that LFC and LFN were mainly distributed in the upper 30 cm of soils, and the sites with permafrost had significantly higher contents of LFC and LFN than those from the sites without existing permafrost. The LFC and LFN decreased sharplywith depth, suggesting that the soil organicmatter (SOM) in this areawas highly decomposed in deep soils. Soil moisture and bulk density explained approximately 50% of the variances in LFC and LFN for all the sampling sites, while soil moisture explained approximately 30% of the variance in permafrost sites. Both the C:N ratios and LFC: LFN ratios in the sites with permafrost were higher than those in the sites without permafrost. The results suggested that the permafrost and land cover types are the main factors controlling LFOM content and stock, and that permafrost degradation would lead to a decrease of LFOM and soil C: N ratios, thus accelerating the decomposition of SOM. (C) 2017 Elsevier B.V. All rights reserved. |
资助项目 | National Natural Science Foundation of China[91547119] ; National Natural Science Foundation of China[41661013] |
WOS研究方向 | Environmental Sciences & Ecology |
语种 | 英语 |
出版者 | ELSEVIER SCIENCE BV |
WOS记录号 | WOS:000414160500117 |
状态 | 已发表 |
内容类型 | 期刊论文 |
源URL | [http://119.78.100.223/handle/2XXMBERH/32820] |
专题 | 土木工程学院 |
通讯作者 | Zhao, Lin |
作者单位 | 1.Lanzhou Univ Technol, Sch Civil Engn, 287 Langonping Rd, Lanzhou 730050, Gansu, Peoples R China 2.Chinese Acad Sci, Cryosphere Res Stn Qinghai Tibetan Plateau, State Key Lab Cryospher Sci, Northwest Inst Ecoenvironm & Resources, 320 West Donggang Rd, Lanzhou 730000, Gansu, Peoples R China 3.Lanzhou Jiaotong Univ, Sch Environm & Municipal Engn, 88 West Anning Rd, Lanzhou 730070, Gansu, Peoples R China 4.Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Wu, Xiaodong,Zhao, Lin,Hu, Guojie,et al. Permafrost and land cover as controlling factors for light fraction organic matter on the southern Qinghai-Tibetan plateau[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2018,613:1165-1174. |
APA | Wu, Xiaodong,Zhao, Lin,Hu, Guojie,Liu, Guimin,Li, Wangping,&Ding, Yongjian.(2018).Permafrost and land cover as controlling factors for light fraction organic matter on the southern Qinghai-Tibetan plateau.SCIENCE OF THE TOTAL ENVIRONMENT,613,1165-1174. |
MLA | Wu, Xiaodong,et al."Permafrost and land cover as controlling factors for light fraction organic matter on the southern Qinghai-Tibetan plateau".SCIENCE OF THE TOTAL ENVIRONMENT 613(2018):1165-1174. |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论