Carbon dioxide exchange between the atmosphere and an alpine shrubland meadow during the growing season on the Qinghai-Tibetan Plateau

	Carbon dioxide exchange between the atmosphere and an alpine shrubland meadow during the growing season on the Qinghai-Tibetan Plateau
	Zhao, L ; Li, YN ; Gu, S ; Zhao, XQ ; Xu, SX ; Yu, GR
刊名	journal of integrative plant biology
	2005-03-01
卷号	47 期号:3 页码:271-282
关键词	alpine shrubland meadow CO2 exchange Qinghai-Tibetan Plateau
合作状况	其它
中文摘要	in the present study, we used the eddy covariance method to measure co2 exchange between the atmosphere and an alpine shrubland meadow ecosystem (37°36'n, 101°18'e; 3 250 m a.s.l.) on the qinghai-tibetan plateau, china, during the growing season in 2003, from 20 april to 30 september. this meadow is dominated by formations of potentilla fruticosa l. the soil is mol-cryic cambisols. during the study period, the meadow was not grazed. the maximum rates of co2 uptake and release derived from the diurnal course of co2 flux were -9.38 and 5.02 μmol•m-2•s-1, respectively. the largest daily co2 uptake was 1.7 g c•m-2•d-1 on 14 july, which is less than half that of an alpine kobresia meadow ecosystem at similar latitudes. daily co2 uptake during the measurement period indicated that the alpine shrubland meadow ecosystem may behave as a sink of atmospheric co2 during the growing season. the daytime co2 uptake was correlated exponentially or linearly with the daily photo synthetic photon flux density each month. the daytime average water use efficiency of the ecosystem was 6.47 mg co2/g h2o. the efficiency of the ecosystem increased with a decrease in vapor pressure deficit.
英文摘要	in the present study, we used the eddy covariance method to measure co2 exchange between the atmosphere and an alpine shrubland meadow ecosystem (37 degrees 36'n, 101 degrees 18' e; 3 250 in a.s.l.) on the qinghai-tibetan plateau, china, during the growing season in 2003, from 20 april to 30 september. this meadow is dominated by formations of potentilla fruticosa l. the soil is mol-cryic cambisols. during the study period, the meadow was not grazed. the maximum rates of co2 uptake and release derived from the diurnal course of co2 flux were -9.38 and 5.02 mu mol center dot m(-2)center dot s(-1), respectively. the largest daily co2 uptake was 1.7 g c center dot m(-2)center dot d(-1) on 14 july, which is less than half that of an alpine kobresia meadow ecosystem at similar latitudes. daily co2 uptake during the measurement period indicated that the alpine shrubland meadow ecosystem may behave as a sink of atmospheric co2 during the growing season. the daytime co2 uptake was correlated exponentially or linearly with the daily photosynthetic photon flux density each month. the daytime average water use efficiency of the ecosystem was 6.47 mg co2/g h2o. the efficiency of the ecosystem increased with a decrease in vapor pressure deficit.
学科主题	生物科学
WOS标题词	science & technology ; life sciences & biomedicine
类目[WOS]	biochemistry & molecular biology ; plant sciences
研究领域[WOS]	biochemistry & molecular biology ; plant sciences
关键词[WOS]	native tallgrass prairie ; water-vapor ; ecosystem ; fluxes ; model ; sink
收录类别	SCI
语种	英语
WOS记录号	WOS:000227555900003
公开日期	2009-11-19
内容类型	期刊论文
源URL	[http://ir.nwipb.ac.cn/handle/363003/492]
专题	西北高原生物研究所_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, Qinghai 810001, Peoples R China 2.Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Zhao, L,Li, YN,Gu, S,et al. Carbon dioxide exchange between the atmosphere and an alpine shrubland meadow during the growing season on the Qinghai-Tibetan Plateau[J]. journal of integrative plant biology,2005,47(3):271-282.
APA	Zhao, L,Li, YN,Gu, S,Zhao, XQ,Xu, SX,&Yu, GR.(2005).Carbon dioxide exchange between the atmosphere and an alpine shrubland meadow during the growing season on the Qinghai-Tibetan Plateau.journal of integrative plant biology,47(3),271-282.
MLA	Zhao, L,et al."Carbon dioxide exchange between the atmosphere and an alpine shrubland meadow during the growing season on the Qinghai-Tibetan Plateau".journal of integrative plant biology 47.3(2005):271-282.