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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
ISSN1351-0754
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
被引频次:14[WOS]   [WOS记录]     [WOS相关记录]
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
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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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