Soil Organic Carbon Pools and Stocks in Permafrost-Affected Soils on the Tibetan Plateau | |
Doerfer, Corina ; Kuehn, Peter ; Baumann, Frank ; He, Jin-Sheng ; Scholten, Thomas | |
刊名 | plos one |
2013 | |
关键词 | C-13 NMR-SPECTROSCOPY QINGHAI-TIBET DENSITY FRACTIONS TEMPERATURE-DEPENDENCE MATTER DECOMPOSITION CLIMATIC-CHANGE ALPINE MEADOW TUNDRA SOILS FOREST SOILS CHINA |
DOI | 10.1371/journal.pone.0057024 |
英文摘要 | The Tibetan Plateau reacts particularly sensitively to possible effects of climate change. Approximately two thirds of the total area is affected by permafrost. To get a better understanding of the role of permafrost on soil organic carbon pools and stocks, investigations were carried out including both discontinuous (site Huashixia, HUA) and continuous permafrost (site Wudaoliang, WUD). Three organic carbon fractions were isolated using density separation combined with ultrasonic dispersion: the light fractions (<1.6 g cm(-3)) of free particulate organic matter (FPOM) and occluded particulate organic matter (OPOM), plus a heavy fraction (>1.6 g cm(-3)) of mineral associated organic matter (MOM). The fractions were analyzed for C, N, and their portion of organic C. FPOM contained an average SOC content of 252 g kg(-1). Higher SOC contents (320 g kg(-1)) were found in OPOM while MOM had the lowest SOC contents (29 g kg(-1)). Due to their lower density the easily decomposable fractions FPOM and OPOM contribute 27% (HUA) and 22% (WUD) to the total SOC stocks. In HUA mean SOC stocks (0-30 cm depth) account for 10.4 kg m(-2), compared to 3.4 kg m(-2) in WUD. 53% of the SOC is stored in the upper 10 cm in WUD, in HUA only 39%. Highest POM values of 36% occurred in profiles with high soil moisture content. SOC stocks, soil moisture and active layer thickness correlated strongly in discontinuous permafrost while no correlation between SOC stocks and active layer thickness and only a weak relation between soil moisture and SOC stocks could be found in continuous permafrost. Consequently, permafrost-affected soils in discontinuous permafrost environments are susceptible to soil moisture changes due to alterations in quantity and seasonal distribution of precipitation, increasing temperature and therefore evaporation.; Multidisciplinary Sciences; SCI(E); 9; ARTICLE; 2; 8 |
语种 | 英语 |
内容类型 | 期刊论文 |
源URL | [http://ir.pku.edu.cn/handle/20.500.11897/391957] |
专题 | 城市与环境学院 |
推荐引用方式 GB/T 7714 | Doerfer, Corina,Kuehn, Peter,Baumann, Frank,et al. Soil Organic Carbon Pools and Stocks in Permafrost-Affected Soils on the Tibetan Plateau[J]. plos one,2013. |
APA | Doerfer, Corina,Kuehn, Peter,Baumann, Frank,He, Jin-Sheng,&Scholten, Thomas.(2013).Soil Organic Carbon Pools and Stocks in Permafrost-Affected Soils on the Tibetan Plateau.plos one. |
MLA | Doerfer, Corina,et al."Soil Organic Carbon Pools and Stocks in Permafrost-Affected Soils on the Tibetan Plateau".plos one (2013). |
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