Biotic and climatic controls on interannual variability in carbon fluxes across terrestrial ecosystems

	Biotic and climatic controls on interannual variability in carbon fluxes across terrestrial ecosystems
	Shao, Junjiong ; Zhou, Xuhui ; Luo, Yiqi ; Li, Bo ; Aurela, Mika ; Billesbach, David ; Blanken, Peter D. ; Bracho, Rosvel ; Chen, Jiquan ; Fischer, Marc ; Fu, Yuling ; Gu, Lianhong ; Han, Shijie ; He, Yongtao ; Kolb, Thomas ; Li, Yingnian ; Nagy, Zoltan ; Niu, Shuli ; Oechel, Walter C. ; Pinter, Krisztina ; Shi, Peili ; Suyker, Andrew ; Torn, Margaret ; Varlagin, Andrej ; Wang, Huimin ; Yan, Junhua ; Yu, Guirui ; Zhang, Junhui
刊名	AGRICULTURAL AND FOREST METEOROLOGY
	2015-06-01
英文摘要	Interannual variability (IAV, represented by standard deviation) in net ecosystem exchange of CO2 (NEE) is mainly driven by climatic drivers and biotic variations (i.e., the changes in photosynthetic and respiratory responses to climate), the effects of which are referred to as climatic (CE) and biotic effects (BE), respectively. Evaluating the relative contributions of CE and BE to the IAV in carbon (C) fluxes and understanding their controlling mechanisms are critical in projecting ecosystem changes in the future climate. In this study, we applied statistical methods with flux data from 65 sites located in the Northern Hemisphere to address this issue. Our results showed that the relative contribution of BE (CnBE) and CE (CnCE) to the IAV in NEE was 57%+/- 14% and 43%+/- 14%, respectively. The discrepancy in the CnBE among sites could be largely explained by water balance index (WBI). Across water-stressed ecosystems, the CnBE decreased with increasing aridity (slope =0.18%mm(-1)). In addition, the CnBE tended to increase and the uncertainty reduced as timespan of available data increased from 5 to 15 years. Inter-site variation of the IAV in NEE mainly resulted from the IAV in BE (72%) compared to that in CE (37%). Interestingly, positive correlations between BE and CE occurred in grasslands and dry ecosystems (r> 0.45, P< 0.05) but not in other ecosystems. These results highlighted the importance of BE in determining the IAV in NEE and the ability of ecosystems to regulate C fluxes under climate change might decline when the ecosystems experience more severe water stress in the future. (C) 2015 Elsevier B.V. All rights reserved.; Interannual variability (IAV, represented by standard deviation) in net ecosystem exchange of CO2 (NEE) is mainly driven by climatic drivers and biotic variations (i.e., the changes in photosynthetic and respiratory responses to climate), the effects of which are referred to as climatic (CE) and biotic effects (BE), respectively. Evaluating the relative contributions of CE and BE to the IAV in carbon (C) fluxes and understanding their controlling mechanisms are critical in projecting ecosystem changes in the future climate. In this study, we applied statistical methods with flux data from 65 sites located in the Northern Hemisphere to address this issue. Our results showed that the relative contribution of BE (CnBE) and CE (CnCE) to the IAV in NEE was 57%+/- 14% and 43%+/- 14%, respectively. The discrepancy in the CnBE among sites could be largely explained by water balance index (WBI). Across water-stressed ecosystems, the CnBE decreased with increasing aridity (slope =0.18%mm(-1)). In addition, the CnBE tended to increase and the uncertainty reduced as timespan of available data increased from 5 to 15 years. Inter-site variation of the IAV in NEE mainly resulted from the IAV in BE (72%) compared to that in CE (37%). Interestingly, positive correlations between BE and CE occurred in grasslands and dry ecosystems (r> 0.45, P< 0.05) but not in other ecosystems. These results highlighted the importance of BE in determining the IAV in NEE and the ability of ecosystems to regulate C fluxes under climate change might decline when the ecosystems experience more severe water stress in the future. (C) 2015 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.nwipb.ac.cn/handle/363003/5552]
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
推荐引用方式 GB/T 7714	Shao, Junjiong,Zhou, Xuhui,Luo, Yiqi,et al. Biotic and climatic controls on interannual variability in carbon fluxes across terrestrial ecosystems[J]. AGRICULTURAL AND FOREST METEOROLOGY,2015.
APA	Shao, Junjiong.,Zhou, Xuhui.,Luo, Yiqi.,Li, Bo.,Aurela, Mika.,...&Zhang, Junhui.(2015).Biotic and climatic controls on interannual variability in carbon fluxes across terrestrial ecosystems.AGRICULTURAL AND FOREST METEOROLOGY.
MLA	Shao, Junjiong,et al."Biotic and climatic controls on interannual variability in carbon fluxes across terrestrial ecosystems".AGRICULTURAL AND FOREST METEOROLOGY (2015).