title: Differential responses of net ecosystem exchange of carbon dioxide to light and temperature between spring and neap tides in subtropical mangrove forests.
abstract: The eddy flux data with field records of tidal water inundation depths of the year 2010 from two mangroves forests in southern China were analyzed to investigate the tidal effect on mangrove carbon cycle. We compared the net ecosystem exchange (NEE) and its responses to light and temperature, respectively, between spring tide and neap tide inundation periods. For the most time of the year 2010, higher daytime NEE values were found during spring tides than during neap tides at both study sites. Regression analysis of daytime NEE to photosynthetically active radiation (PAR) using the Landsberg model showed increased sensitivity of NEE to PAR with higher maximum photosynthetic rate during spring tides than neap tides. In contrast, the light compensation points acquired from the regression function of the Landsberg model were smaller during spring tides than neap tides in most months. The dependence of nighttime NEE on soil temperature was lower under spring tide than under neap tides. All these results above indicated that ecosystem carbon uptake rates of mangrove forests were strengthened, while ecosystem respirations were inhibited during spring tides in comparison with those during neap tides, which needs to be considered in modeling mangrove ecosystem carbon cycle under future sea level rise scenarios.
authors.affiliation: Ministry of Education Key Laboratory for Earth System Modeling, Center for Earth System Science, Tsinghua University, Beijing 100084, China ; Division of Ocean Science and Technology, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Li
authors.affiliation: Division of Ocean Science and Technology, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China ; College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361005, China.
authors.forename: Weizhi
authors.initials: W
authors.lastname: Lu
authors.affiliation: Division of Ocean Science and Technology, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China ; College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361005, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Chen
authors.affiliation: Ministry of Education Key Laboratory for Earth System Modeling, Center for Earth System Science, Tsinghua University, Beijing 100084, China ; Department of Botany and Microbiology, University of Oklahoma, Norman, OK 73019, USA.
authors.forename: Yiqi
authors.initials: Y
authors.lastname: Luo
authors.affiliation: Ministry of Education Key Laboratory for Earth System Modeling, Center for Earth System Science, Tsinghua University, Beijing 100084, China ; Division of Ocean Science and Technology, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
authors.forename: Guanghui
authors.initials: G
authors.lastname: Lin
mesh_terms: D058572:Carbon Footprint; D065928:Forests; D008027:Light; D008954:Models, Biological; D043982:Rhizophoraceae / Q000502:physiology; D012621:Seasons; D013696:Temperature; D055871:Tidal Waves; D014329:Tropical Climate; D053833:Wetlands