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Differential responses of net ecosystem exchange of carbon dioxide to light and temperature between spring and neap tides in subtropical mangrove forests.

Li Q, Lu W, Chen H, Luo Y, Lin G - ScientificWorldJournal (2014)

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

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.

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.

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Related in: MedlinePlus

Map for the locations of two study sites of mangrove forests in southern China (FJZZ: Zhangjiangkou Mangrove National Nature Reserve near the Zhangzhou city of Fujian province; GDZJ: Zhanjiang Mangrove National Nature Reserve near the Zhanjiang city of Guangdong province).
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fig1: Map for the locations of two study sites of mangrove forests in southern China (FJZZ: Zhangjiangkou Mangrove National Nature Reserve near the Zhangzhou city of Fujian province; GDZJ: Zhanjiang Mangrove National Nature Reserve near the Zhanjiang city of Guangdong province).

Mentions: Two eddy flux towers were separately located in Zhangjiangkou Mangrove National Nature Reserve near the Zhangzhou city of Fujian province (FJZZ, 23°55′N, 117°23′E) and Zhanjiang Mangrove National Nature Reserve near the Zhanjiang city of Guangdong province (GDZJ, 21°34′N, 109°45′E) in China (Figure 1). All necessary permits for the described field studies were obtained from the Zhangjiangkou Mangrove National Nature Reserve Administration and Zhanjiang Mangrove National Nature Reserve Administration, respectively. And the field studies did not involve any endangered or protected species. The mangrove forests at FJZZ were mainly composed of Kandelia obovata, Avicennia marina, and Aegiceras corniculatum, while the dominant species at GDZJ were Aegiceras corniculatum, Bruguiera gymnorrhiza, and K. obovata. The average tree height at FJZZ was about 3 m and the average leaf area index (LAI) was 1.7 m2 m−2. At GDZJ, the average mangrove tree height was 4 m, and the LAI was much higher at 3.8 m2 m−2.


Differential responses of net ecosystem exchange of carbon dioxide to light and temperature between spring and neap tides in subtropical mangrove forests.

Li Q, Lu W, Chen H, Luo Y, Lin G - ScientificWorldJournal (2014)

Map for the locations of two study sites of mangrove forests in southern China (FJZZ: Zhangjiangkou Mangrove National Nature Reserve near the Zhangzhou city of Fujian province; GDZJ: Zhanjiang Mangrove National Nature Reserve near the Zhanjiang city of Guangdong province).
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4121014&req=5

fig1: Map for the locations of two study sites of mangrove forests in southern China (FJZZ: Zhangjiangkou Mangrove National Nature Reserve near the Zhangzhou city of Fujian province; GDZJ: Zhanjiang Mangrove National Nature Reserve near the Zhanjiang city of Guangdong province).
Mentions: Two eddy flux towers were separately located in Zhangjiangkou Mangrove National Nature Reserve near the Zhangzhou city of Fujian province (FJZZ, 23°55′N, 117°23′E) and Zhanjiang Mangrove National Nature Reserve near the Zhanjiang city of Guangdong province (GDZJ, 21°34′N, 109°45′E) in China (Figure 1). All necessary permits for the described field studies were obtained from the Zhangjiangkou Mangrove National Nature Reserve Administration and Zhanjiang Mangrove National Nature Reserve Administration, respectively. And the field studies did not involve any endangered or protected species. The mangrove forests at FJZZ were mainly composed of Kandelia obovata, Avicennia marina, and Aegiceras corniculatum, while the dominant species at GDZJ were Aegiceras corniculatum, Bruguiera gymnorrhiza, and K. obovata. The average tree height at FJZZ was about 3 m and the average leaf area index (LAI) was 1.7 m2 m−2. At GDZJ, the average mangrove tree height was 4 m, and the LAI was much higher at 3.8 m2 m−2.

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

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.

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.

Show MeSH
Related in: MedlinePlus