Spatiotemporal variations of CO2 fluxes in a Cynodon-dominated riparian zone of the Three Gorges Reservoir (TGR), China

doi:10.1093/jpe/rtx054

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	Spatiotemporal variations of CO2 fluxes in a Cynodon-dominated riparian zone of the Three Gorges Reservoir (TGR), China
	Xu, Wennian 3; Fan, Yi 2; Shao, Changliang 2; Ouyang, Zutao 2; Zhang, Quanfa 1; Chen, Fangqing 3,4; Liu, Ju 4; Chen, Jiquan 2; Zhang, Wenli 3,4
刊名	JOURNAL OF PLANT ECOLOGY
	2018-12-01
卷号	11 期号:6 页码:877-886
关键词	CO2 exchange riparian submergence spatial variability Q(10) TGD
ISSN号	1752-9921
DOI	10.1093/jpe/rtx054
英文摘要	Aims Riparian ecosystems play an important role in overall ecosystem function, including the global carbon cycle of terrestrial ecosystems, at both landscape and global scales. Yet few studies have reported in situ measurements of CO2 in riparian areas where flooding is a unique disturbance to carbon cycling. Methods At multiple locations across riparian zones (RZ) with different water submergences in Xiangxi Bay (XXB), we studied seasonal variations of CO2 exchange between this Cynodon-dominated community and the atmosphere for 2 years by using static chambers. Important Findings We found that the seasonal changes in CO2 fluxes were apparent and dependent on the biophysical environment. In the beginning of spring, low gross primary productivity (GPP) in lightly flooded zones (LFZ) resulted in a positive net ecosystem exchange (NEE), indicating a net CO2 source. With the increase in temperature, more species and vegetation abundance appeared, and the increased GPP turned the LFZ from a net CO2 source into a sink. This transition seemed predominantly controlled by the physiological growth of vegetation. The mean NEEs, REs and the light-use efficiency (alpha) of the vegetation at HFZ and MFZ were significantly higher than those at LFZ and UFZ. Yet the coefficients of variation (CV) of NEE and RE at MFZ and HFZ were lower than those at LFZ and UFZ. Submergence promoted the emission and uptake of CO2 to the atmosphere. Elongated submergence reduced the number of species and lowered the spatial variability of the RZ, further lowering the variation of the CO2 exchange.
资助项目	National Natural Science Foundation of China (NSFC)[30900196] ; National Natural Science Foundation of China (NSFC)[51278281] ; Natural Science Foundation of Hubei Province[2015CFC834] ; Provincial Department of Education Scientific research projects[Q20151209] ; Key Laboratory of Aquatic Botany and Watershed Ecology at the Chinese Academy of Sciences ; Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education[KF2016-03]
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000456053600008
内容类型	期刊论文
源URL	[http://202.127.146.157/handle/2RYDP1HH/6178]
专题	中国科学院武汉植物园
通讯作者	Xu, Wennian; Zhang, Wenli
作者单位	1.Chinese Acad Sci, Wuhan Bot Garden, Key Lab Aquat Bot & Watershed Ecol, Wuhan 430074, Hubei, Peoples R China 2.Michigan State Univ, Ctr Global Change & Earth Observat Geog Environm, E Lansing, MI 48823 USA 3.China Three Gorges Univ, Hubei Int Sci & Technol Cooperat Ctr Ecol Conserv, Yichang 443002, Peoples R China 4.China Three Gorges Univ, Coll Biol & Pharmaceut Sci, 8 Daxue Rd, Yichang 443002, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Xu, Wennian,Fan, Yi,Shao, Changliang,et al. Spatiotemporal variations of CO2 fluxes in a Cynodon-dominated riparian zone of the Three Gorges Reservoir (TGR), China[J]. JOURNAL OF PLANT ECOLOGY,2018,11(6):877-886.
APA	Xu, Wennian.,Fan, Yi.,Shao, Changliang.,Ouyang, Zutao.,Zhang, Quanfa.,...&Zhang, Wenli.(2018).Spatiotemporal variations of CO2 fluxes in a Cynodon-dominated riparian zone of the Three Gorges Reservoir (TGR), China.JOURNAL OF PLANT ECOLOGY,11(6),877-886.
MLA	Xu, Wennian,et al."Spatiotemporal variations of CO2 fluxes in a Cynodon-dominated riparian zone of the Three Gorges Reservoir (TGR), China".JOURNAL OF PLANT ECOLOGY 11.6(2018):877-886.