Seasonal variations in carbon dioxide exchange in an alpine wetland meadow on the Qinghai-Tibetan Plateau

NWIPB OpenIR

	Seasonal variations in carbon dioxide exchange in an alpine wetland meadow on the Qinghai-Tibetan Plateau
	Zhao, L. ; Li, J. ; Xu, S. ; Zhou, H. ; Li, Y. ; Gu, S. ; Zhao, X.
	2010
发表期刊	BIOGEOSCIENCES ; Zhao, L; Li, J; Xu, S; Zhou, H; Li, Y; Gu, S; Zhao, X.Seasonal variations in carbon dioxide exchange in an alpine wetland meadow on the Qinghai-Tibetan Plateau,BIOGEOSCIENCES,2010,7(4):1207-1221
摘要	Alpine wetland meadow could functions as a carbon sink due to it high soil organic content and low decomposition. However, the magnitude and dynamics of carbon stock in alpine wetland ecosystems are not well quantified Therefore, understanding how environmental variables affect the processes that regulate carbon fluxes in alpine wetland meadow on the Qinghai-Tibetan Plateau is critical. To address this issue, Gross Primary Production (GPP), Ecosystem Respiration (R(eco)), and Net Ecosystem Exchange (NEE) were examined in an alpine wetland meadow using the eddy covariance method from October 2003 to December 2006 at the Haibei Research Station of the Chinese Academy of Sciences. Seasonal patterns of GPP and R(eco) were closely associated with leaf area index (LAI). The R(eco) showed a positive exponential to soil temperature and relatively low R(eco) occurred during the non-growing season after a rain event. This result is inconsistent with the result observed in alpine shrubland meadow. In total, annual GPP were estimated at 575.7, 682.9, and 630.97 g C m(-2) in 2004, 2005, and 2006, respectively. Meanwhile, the Rem were equal to 676.8, 726.4, 808.2 g C m(-2), and thus the NEE were 101.1, 44.0 and 173.2 g C m(-2). These results indicated that the alpine wetland meadow was a moderately source of carbon dioxide (CO(2)). The observed carbon dioxide fluxes in the alpine wetland meadow were higher than other alpine meadow such as Kobresia humilis meadow and shrubland meadow.; Alpine wetland meadow could functions as a carbon sink due to it high soil organic content and low decomposition. However, the magnitude and dynamics of carbon stock in alpine wetland ecosystems are not well quantified Therefore, understanding how environmental variables affect the processes that regulate carbon fluxes in alpine wetland meadow on the Qinghai-Tibetan Plateau is critical. To address this issue, Gross Primary Production (GPP), Ecosystem Respiration (R(eco)), and Net Ecosystem Exchange (NEE) were examined in an alpine wetland meadow using the eddy covariance method from October 2003 to December 2006 at the Haibei Research Station of the Chinese Academy of Sciences. Seasonal patterns of GPP and R(eco) were closely associated with leaf area index (LAI). The R(eco) showed a positive exponential to soil temperature and relatively low R(eco) occurred during the non-growing season after a rain event. This result is inconsistent with the result observed in alpine shrubland meadow. In total, annual GPP were estimated at 575.7, 682.9, and 630.97 g C m(-2) in 2004, 2005, and 2006, respectively. Meanwhile, the Rem were equal to 676.8, 726.4, 808.2 g C m(-2), and thus the NEE were 101.1, 44.0 and 173.2 g C m(-2). These results indicated that the alpine wetland meadow was a moderately source of carbon dioxide (CO(2)). The observed carbon dioxide fluxes in the alpine wetland meadow were higher than other alpine meadow such as Kobresia humilis meadow and shrubland meadow.
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/35844
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Zhao, L.,Li, J.,Xu, S.,et al. Seasonal variations in carbon dioxide exchange in an alpine wetland meadow on the Qinghai-Tibetan Plateau[J]. BIOGEOSCIENCES, Zhao, L; Li, J; Xu, S; Zhou, H; Li, Y; Gu, S; Zhao, X.Seasonal variations in carbon dioxide exchange in an alpine wetland meadow on the Qinghai-Tibetan Plateau,BIOGEOSCIENCES,2010,7(4):1207-1221,2010.
APA	Zhao, L..,Li, J..,Xu, S..,Zhou, H..,Li, Y..,...&Zhao, X..(2010).Seasonal variations in carbon dioxide exchange in an alpine wetland meadow on the Qinghai-Tibetan Plateau.BIOGEOSCIENCES.
MLA	Zhao, L.,et al."Seasonal variations in carbon dioxide exchange in an alpine wetland meadow on the Qinghai-Tibetan Plateau".BIOGEOSCIENCES (2010).