Knowledge Management System of Northwest Institute of Plateau Biology, CAS
Responses of soil microbial respiration to thermal stress in alpine steppe on the Tibetan plateau | |
Chang, X.2,5; Wang, S.1,3,4; Luo, C.2; Zhang, Z.2,3,4; Duan, J.2,3,4; Zhu, X.1,2; Lin, Q.2; Xu, B.2,3,4 | |
2012-06-01 | |
发表期刊 | EUROPEAN JOURNAL OF SOIL SCIENCE |
ISSN | 1351-0754 |
卷号 | 63期号:3页码:325-331 |
文章类型 | Article |
摘要 | Extensive research has focused on the temperature sensitivity of microbial respiration in tundra and alpine meadows. However, the response of microbial respiration to thermal stress in alpine steppe soils, which have less organic matter and greater aeration, has received less attention. We investigated spatial and temporal variations in microbial respiration using an incubation experiment under different temperature (0, 15 and 30 degrees C) and different percentages of water-holding capacity (WHC) (50 and 100%) conditions in the alpine steppe, and using a subsequent cooling experiment determined the thermal stress' of soil microorganisms in response to increased temperature in the alpine steppe ecosystem. Microbial respiration rates decreased with increasing temperature at both 50 and 100% WHC for three sampling locations. Thermal stress of soil microorganisms under increased temperatures was found in the alpine steppe because subsequent cooling led to an increase in microbial respiration rates. Soil moisture did not affect microbial respiration, but the temperature sensitivity (Q10) of microbial respiration varied with the interactive effect between soil moisture and sampling location. Our findings suggest that the response of microbial respiration to high temperature may not be always positive as bacteria may experience thermal stress in the alpine steppe. Therefore, it is necessary to include thermal stress responses in alpine steppe models, as they may represent an important negative feedback effect on microbial respiration.; Extensive research has focused on the temperature sensitivity of microbial respiration in tundra and alpine meadows. However, the response of microbial respiration to thermal stress in alpine steppe soils, which have less organic matter and greater aeration, has received less attention. We investigated spatial and temporal variations in microbial respiration using an incubation experiment under different temperature (0, 15 and 30 degrees C) and different percentages of water-holding capacity (WHC) (50 and 100%) conditions in the alpine steppe, and using a subsequent cooling experiment determined the thermal stress' of soil microorganisms in response to increased temperature in the alpine steppe ecosystem. Microbial respiration rates decreased with increasing temperature at both 50 and 100% WHC for three sampling locations. Thermal stress of soil microorganisms under increased temperatures was found in the alpine steppe because subsequent cooling led to an increase in microbial respiration rates. Soil moisture did not affect microbial respiration, but the temperature sensitivity (Q10) of microbial respiration varied with the interactive effect between soil moisture and sampling location. Our findings suggest that the response of microbial respiration to high temperature may not be always positive as bacteria may experience thermal stress in the alpine steppe. Therefore, it is necessary to include thermal stress responses in alpine steppe models, as they may represent an important negative feedback effect on microbial respiration. |
WOS标题词 | Science & Technology ; Life Sciences & Biomedicine |
关键词[WOS] | ORGANIC-MATTER DECOMPOSITION ; CLIMATE-CHANGE ; TEMPERATURE SENSITIVITY ; CARBON-CYCLE ; FOREST SOIL ; MINERALIZATION ; MOISTURE ; NITROGEN ; TUNDRA ; ADAPTATION |
收录类别 | SCI |
语种 | 英语 |
WOS研究方向 | Agriculture |
WOS类目 | Soil Science |
WOS记录号 | WOS:000304084100002 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://210.75.249.4/handle/363003/3666 |
专题 | 中国科学院西北高原生物研究所 |
作者单位 | 1.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China 2.Chinese Acad Sci, Haibei Alpine Meadow Ecosyst Res Stn, NW Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810008, Peoples R China 3.Univ Tibet, Naqu Ecol & Environm Observat & Res Stn, Naqu 852000, Peoples R China 4.Chinese Acad Sci, Inst Tibetan Plateau Res, Naqu 852000, Peoples R China 5.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Chang, X.,Wang, S.,Luo, C.,et al. Responses of soil microbial respiration to thermal stress in alpine steppe on the Tibetan plateau[J]. EUROPEAN JOURNAL OF SOIL SCIENCE,2012,63(3):325-331. |
APA | Chang, X..,Wang, S..,Luo, C..,Zhang, Z..,Duan, J..,...&Xu, B..(2012).Responses of soil microbial respiration to thermal stress in alpine steppe on the Tibetan plateau.EUROPEAN JOURNAL OF SOIL SCIENCE,63(3),325-331. |
MLA | Chang, X.,et al."Responses of soil microbial respiration to thermal stress in alpine steppe on the Tibetan plateau".EUROPEAN JOURNAL OF SOIL SCIENCE 63.3(2012):325-331. |
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