Effects of temperature on CO2 exchange between the atmosphere and an alpine meadow

NWIPB OpenIR

	Effects of temperature on CO2 exchange between the atmosphere and an alpine meadow
	Gu, S.; Tang, Y.; Du, M.; Cui, X.; Kato, T.; Li, Y.; Zhao, X.
	2005
发表期刊	PHYTON-ANNALES REI BOTANICAE
卷号	45 期号:4 页码:361-370
文章类型	Article
摘要	The alpine meadow ecosystem on the Qinghai-Tibetan Plateau is characterized by low temperatures because of its high elevation. The low-temperature environment may limit both ecosystem photosynthetic CO2 uptake and ecosystem respiration, and thus affect the net ecosystem CO2 exchange (NEE). We clarified the low-temperature constraint on photosynthesis and respiration in an alpine meadow ecosystem on the northern edge of the plateau using flux measurements obtained by the eddy covariance technique in two growing seasons. When we compared NEE during the two periods, during which the leaf area index and other environmental parameters were similar but the mean temperature differed, we found that NEE from 9 August to 10 September 2001, when the average temperature was low, was greater than that during the same period in 2002, when the average temperature was high, but the ecosystem gross primary production was similar during the two periods. Further analysis showed that ecosystem respiration was significantly higher in 2002 than in 2001 during the study period, as estimated from the relationship between temperature and nighttime ecosystem respiration. The results suggest that low temperature controlled the NEE mainly through its influence on ecosystem respiration. The annual NEE, estimated from 15 January 2002 to 14 January 2003, was about 290 g CO2 m(-2) year(-1). The optimum temperature for ecosystem NEE under light-saturated conditions was estimated to be around 15 degrees C.; The alpine meadow ecosystem on the Qinghai-Tibetan Plateau is characterized by low temperatures because of its high elevation. The low-temperature environment may limit both ecosystem photosynthetic CO2 uptake and ecosystem respiration, and thus affect the net ecosystem CO2 exchange (NEE). We clarified the low-temperature constraint on photosynthesis and respiration in an alpine meadow ecosystem on the northern edge of the plateau using flux measurements obtained by the eddy covariance technique in two growing seasons. When we compared NEE during the two periods, during which the leaf area index and other environmental parameters were similar but the mean temperature differed, we found that NEE from 9 August to 10 September 2001, when the average temperature was low, was greater than that during the same period in 2002, when the average temperature was high, but the ecosystem gross primary production was similar during the two periods. Further analysis showed that ecosystem respiration was significantly higher in 2002 than in 2001 during the study period, as estimated from the relationship between temperature and nighttime ecosystem respiration. The results suggest that low temperature controlled the NEE mainly through its influence on ecosystem respiration. The annual NEE, estimated from 15 January 2002 to 14 January 2003, was about 290 g CO2 m(-2) year(-1). The optimum temperature for ecosystem NEE under light-saturated conditions was estimated to be around 15 degrees C.
关键词	Alpine Grassland Ecosystem Respiration Qinghai-tibetan Plateau Photosynthesis Primary Production
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
学科领域	植物学
关键词[WOS]	QINGHAI-TIBETAN PLATEAU ; CARBON-DIOXIDE EXCHANGE ; TERRESTRIAL ECOSYSTEMS ; FLUXES ; CYCLE ; NORTHERN ; STORAGE ; PRAIRIE ; SINK ; SOIL
收录类别	SCI ; ISTP
语种	英语
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
WOS记录号	WOS:000241970700048
引用统计	被引频次：4[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/363003/1308
专题	中国科学院西北高原生物研究所
作者单位	1.Chinese Acad Sci, NW Plateau Inst Biol, Xining 810001, Peoples R China 2.Natl Inst Environm Studies, Tsukuba, Ibaraki 3058506, Japan 3.Natl Inst Agroenvironm Sci, Tsukuba, Ibaraki 3058604, Japan 4.Chinese Acad Sci, Grad Sch, Coll Resources & Environm, Beijing 100079, Peoples R China 5.Japan Agcy Marine Earth Sci & Technol, Frontier Res Ctr Global Change, Yokohama, Kanagawa 2360001, Japan
推荐引用方式 GB/T 7714	Gu, S.,Tang, Y.,Du, M.,et al. Effects of temperature on CO2 exchange between the atmosphere and an alpine meadow[J]. PHYTON-ANNALES REI BOTANICAE,2005,45(4):361-370.
APA	Gu, S..,Tang, Y..,Du, M..,Cui, X..,Kato, T..,...&Zhao, X..(2005).Effects of temperature on CO2 exchange between the atmosphere and an alpine meadow.PHYTON-ANNALES REI BOTANICAE,45(4),361-370.
MLA	Gu, S.,et al."Effects of temperature on CO2 exchange between the atmosphere and an alpine meadow".PHYTON-ANNALES REI BOTANICAE 45.4(2005):361-370.