Temporal variation in soil respiration and its sensitivity to temperature along a hydrological gradient in an alpine wetland of the Tibetan Plateau

doi:10.1016/j.agrformet.2019.107854

	Temporal variation in soil respiration and its sensitivity to temperature along a hydrological gradient in an alpine wetland of the Tibetan Plateau
	Yu, Lingfei 1; Wang, Hao 2; Wang, Yonghui 3; Zhang, Zhenhua 4; Chen, Litong 4; Liang, Naishen 5; He, Jin-Sheng
	2020
发表期刊	AGRICULTURAL AND FOREST METEOROLOGY
ISSN	0168-1923
卷号	282
摘要	Wetlands are predicted to experience lowered water tables due to permafrost degradation in the Tibetan Plateau. These changes may affect carbon cycle processes such as soil respiration (R-s). However, the magnitude, patterns and controls of R-s remain poorly understood in alpine wetlands with their distinct hydrological regimes. Here, we conducted a field study on R-s from 2012 to 2014 in three alpine ecosystems on the Tibetan Plateau-fen, wet meadow and meadow-with soil water decreases along hydrological gradients. From 2012 to 2014, the annual R-s was 128.9-193.3 g C m(-2)yr(-1), 281.5-342.9 g C m(-2)yr(-1), and 663.4-709.1 g C m(-2)yr(-1) for the fen, wet meadow, and meadow, respectively. An abrupt increase in CO2 emissions was caused by the spring thawing of the frozen soil in the fen and wet meadow, contributing 20.4-37.6% and 13.2-17.4%, respectively, to the annual R-s. The diurnal variation in the R-s was site specific among the three ecosystems, with one peak at 1300 h in the fen and meadow and two peaks at 1300 h and 1900 h in the wet meadow. The temperature-independent components of the diurnal variation in R-s were generally explained by photosynthetically active radiation in the fen and wet meadow, but not in the meadow. The temperature sensitivity of the R-s (unconfounded Q(10)) varied significantly among the three ecosystems, with the highest values occurring in the wet meadow, implying that permafrost thaw-induced wetland drying from the fen to the wet meadow could enhance the response of CO2 emissions to climate warming but that further drying from the wet meadow to the meadow probably weakens the effect of warming on the R-s. Our study emphasized the important role of the hydrological regime in regulating the temporal variation in R-s and its response to climate warming.
关键词	Meadow Q(10) Soil CO2 flux Soil water content Spring thawing Wetland
学科领域	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
DOI	10.1016/j.agrformet.2019.107854
收录类别	SCI
语种	英语
WOS关键词	CARBON-DIOXIDE ; ECOSYSTEM RESPIRATION ; GLOBAL DISTRIBUTION ; METHANE EMISSION ; CLIMATE-CHANGE ; NITROUS-OXIDE ; WATER-CONTENT ; CO2 EFFLUX ; SNOW DEPTH ; FLUXES
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000525813300001
出版者	ELSEVIER
文献子类	Article
出版地	AMSTERDAM
EISSN	1873-2240
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31670484, 31630009]
作者邮箱	jshe@pku.edu.cn
引用统计	被引频次：23[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/21815
专题	植被与环境变化国家重点实验室
作者单位	1.Peking Univ, Coll Urban & Environm Sci, Dept Ecol, Key Lab Earth Surface Proc,Minist Educ, 5 Yiheyuan Rd, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, 20 Nanxincun, Beijing 100093, Peoples R China 3.Lanzhou Univ, Inst Innovat Ecol, 768 Jiayuguan W Rd, Lanzhou 730020, Peoples R China 4.Inner Mongolia Univ, Sch Ecol & Environm, Dept Ecol, 235 West Coll Rd, Hohhot 010021, Peoples R China 5.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, 23 Xining Rd, Xining 810008, Peoples R China 6.Natl Inst Environm Studies, Ctr Global Environm Res, Tsukuba, Ibaraki 3058506, Japan 7.Lanzhou Univ, Coll Pastoral Agr Sci & Technol, State Key Lab Grassland & Agroecosyst, 768 Jiayuguan W Rd, Lanzhou 730020, Peoples R China
推荐引用方式 GB/T 7714	Yu, Lingfei,Wang, Hao,Wang, Yonghui,et al. Temporal variation in soil respiration and its sensitivity to temperature along a hydrological gradient in an alpine wetland of the Tibetan Plateau[J]. AGRICULTURAL AND FOREST METEOROLOGY,2020,282.
APA	Yu, Lingfei.,Wang, Hao.,Wang, Yonghui.,Zhang, Zhenhua.,Chen, Litong.,...&He, Jin-Sheng.(2020).Temporal variation in soil respiration and its sensitivity to temperature along a hydrological gradient in an alpine wetland of the Tibetan Plateau.AGRICULTURAL AND FOREST METEOROLOGY,282.
MLA	Yu, Lingfei,et al."Temporal variation in soil respiration and its sensitivity to temperature along a hydrological gradient in an alpine wetland of the Tibetan Plateau".AGRICULTURAL AND FOREST METEOROLOGY 282(2020).

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