气候变化领域集成服务门户(CCPortal): Non-growing-season soil respiration is controlled by freezing and thawing processes in the summer monsoon-dominated Tibetan alpine grassland

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DOI	10.1002/2013GB004760
	Non-growing-season soil respiration is controlled by freezing and thawing processes in the summer monsoon-dominated Tibetan alpine grassland
	Wang, Yonghui; Liu, Huiying; Chung, Haegeun; Yu, Lingfei; Mi, Zhaorong; Geng, Yan; Jing, Xin; Wang, Shiping; Zeng, Hui; Cao, Guangmin; Zhao, Xinquan; He, Jin-Sheng
通讯作者	He, JS (通讯作者)
发表日期	2014
ISSN	0886-6236
EISSN	1944-9224
起始页码	1081
结束页码	1095
卷号	28 期号:10
英文摘要	The Tibetan alpine grasslands, sharing many features with arctic tundra ecosystems, have a unique non-growing-season climate that is usually dry and without persistent snow cover. Pronounced winter warming recently observed in this ecosystem may significantly alter the non-growing-season carbon cycle processes such as soil respiration (R-s), but detailed measurements to assess the patterns, drivers of, and potential feedbacks on R-s have not been made yet. We conducted a 4 year study on R-s using a unique R-s measuring system, composed of an automated soil CO2 flux sampling system and a custom-made container, to facilitate measurements in this extreme environment. We found that in the nongrowing season, (1) cumulative R-s was 82-89g C m(-2), accounting for 11.8-13.2% of the annual total R-s; (2) surface soil freezing controlled the diurnal pattern of R-s and bulk soil freezing induced lower reference respiration rate (R-0) and temperature sensitivity (Q(10)) than those in the growing season (0.40-0.53 versus 0.84-1.32 mu mol CO2 m(-2)s(-1) for R-0 and 2.5-2.9 versus 2.9-5.6 for Q(10)); and (3) the intraannual variation in cumulative R-s was controlled by accumulated surface soil temperature. We found that in the summer monsoon-dominated Tibetan alpine grassland, surface soil freezing, bulk soil freezing, and accumulated surface soil temperature are the day-, season-, and year-scale drivers of the non-growing-season R-s, respectively. Our results suggest that warmer winters can trigger carbon loss from this ecosystem because of higher Q(10) of thawed than frozen soils.
关键词	CO2 EFFLUX TEMPERATURE SENSITIVITY ECOSYSTEM RESPIRATION MICROBIAL ACTIVITY ARCTIC ECOSYSTEMS SOLAR-RADIATION NORTH-AMERICA FROZEN SOIL SNOW DEPTH WINTER
英文关键词	winter soil respiration; carbon cycling; alpine ecosystem; soil freezing; Tibetan Plateau
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000344797500005
来源期刊	GLOBAL BIOGEOCHEMICAL CYCLES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258358
推荐引用方式 GB/T 7714	Wang, Yonghui,Liu, Huiying,Chung, Haegeun,et al. Non-growing-season soil respiration is controlled by freezing and thawing processes in the summer monsoon-dominated Tibetan alpine grassland[J]. 中国科学院青藏高原研究所,2014,28(10).
APA	Wang, Yonghui.,Liu, Huiying.,Chung, Haegeun.,Yu, Lingfei.,Mi, Zhaorong.,...&He, Jin-Sheng.(2014).Non-growing-season soil respiration is controlled by freezing and thawing processes in the summer monsoon-dominated Tibetan alpine grassland.GLOBAL BIOGEOCHEMICAL CYCLES,28(10).
MLA	Wang, Yonghui,et al."Non-growing-season soil respiration is controlled by freezing and thawing processes in the summer monsoon-dominated Tibetan alpine grassland".GLOBAL BIOGEOCHEMICAL CYCLES 28.10(2014).