Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13491 |
Sensitivity of soil carbon fractions and their specific stabilization mechanisms to extreme soil warming in a subarctic grassland | |
Poeplau, Christopher1,2; Katterer, Thomas2; Leblans, Niki I. W.3,4; Sigurdsson, Bjarni D.4 | |
2017-03-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2017 |
卷号 | 23期号:3 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; Sweden; Belgium; Iceland |
英文摘要 | Terrestrial carbon cycle feedbacks to global warming are major uncertainties in climate models. For in-depth understanding of changes in soil organic carbon (SOC) after soil warming, long-term responses of SOC stabilization mechanisms such as aggregation, organo-mineral interactions and chemical recalcitrance need to be addressed. This study investigated the effect of 6 years of geothermal soil warming on different SOC fractions in an unmanaged grassland in Iceland. Along an extreme warming gradient of + 0 to similar to+ 40 degrees C, we isolated five fractions of SOC that varied conceptually in turnover rate from active to passive in the following order: particulate organic matter (POM), dissolved organic carbon (DOC), SOC in sand and stable aggregates (SA), SOC in silt and clay (SC-rSOC) and resistant SOC (rSOC). Soil warming of 0.6 degrees C increased bulk SOC by 22 +/- 43% (0-10 cm soil layer) and 27 +/- 54% (20-30 cm), while further warming led to exponential SOC depletion of up to 79 +/- 14% (0-10 cm) and 74 +/- 8% (20-30) in the most warmed plots (similar to+ 40 degrees C). Only the SA fraction was more sensitive than the bulk soil, with 93 +/- 6% (0-10 cm) and 86 +/- 13% (20-30 cm) SOC losses and the highest relative enrichment in C-13 as an indicator for the degree of decomposition (+ 1.6 +/- 1.5 parts per thousand in 0-10 cm and + 1.3 +/- 0.8 parts per thousand in 20-30 cm). The SA fraction mass also declined along the warming gradient, while the SC fraction mass increased. This was explained by deactivation of aggregate-binding mechanisms. There was no difference between the responses of SC-rSOC (slow-cycling) and rSOC (passive) to warming, and C-13 enrichment in rSOC was equal to that in bulk soil. We concluded that the sensitivity of SOC to warming was not a function of age or chemical recalcitrance, but triggered by changes in biophysical stabilization mechanisms, such as aggregation. |
英文关键词 | global change soil carbon fractionation soil organic matter soil warming temperature manipulation temperature sensitivity trophic fractionation delta C-13 |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000396829300028 |
WOS关键词 | ORGANIC-MATTER FRACTIONS ; TEMPERATURE SENSITIVITY ; TERRESTRIAL ECOSYSTEMS ; FOREST ; DECOMPOSITION ; TURNOVER ; DYNAMICS ; MOISTURE ; POOLS ; SYSTEMS |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17872 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Thuenen Inst Climate Smart Agr, Bundesallee 50, D-38116 Braunschweig, Germany; 2.Swedish Univ Agr Sci SLU, Dept Ecol, S-75007 Uppsala, Sweden; 3.Univ Antwerp, Dept Biol, B-2610 Antwerp, Belgium; 4.Agr Univ Iceland, IS-311 Hvanneyri, Borgarnes, Iceland |
推荐引用方式 GB/T 7714 | Poeplau, Christopher,Katterer, Thomas,Leblans, Niki I. W.,et al. Sensitivity of soil carbon fractions and their specific stabilization mechanisms to extreme soil warming in a subarctic grassland[J]. GLOBAL CHANGE BIOLOGY,2017,23(3). |
APA | Poeplau, Christopher,Katterer, Thomas,Leblans, Niki I. W.,&Sigurdsson, Bjarni D..(2017).Sensitivity of soil carbon fractions and their specific stabilization mechanisms to extreme soil warming in a subarctic grassland.GLOBAL CHANGE BIOLOGY,23(3). |
MLA | Poeplau, Christopher,et al."Sensitivity of soil carbon fractions and their specific stabilization mechanisms to extreme soil warming in a subarctic grassland".GLOBAL CHANGE BIOLOGY 23.3(2017). |
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