期刊
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
卷 12, 期 4, 页码 3691-3706出版社
MDPI
DOI: 10.3390/ijerph120403691
关键词
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资金
- National Natural Science Foundation of China [41175136]
- Ministry of Education of China (grant PCSIRT)
- Project of Jiangsu Key Laboratory of Agricultural Meteorology [KYQ1302]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PARD)
- Qing Lan Project of Jiangsu Province
- six sector-excellent-talent Training Programme of Jiangsu Province [2014-NY-015]
With continuous measurements of dissolved oxygen, temperature, irradiance, and wind speed, as well as frequent measurements of pH, oxidation-reduction potential, and algal chlorophyll, temporal dynamics and drivers of ecosystem metabolism in a large nutrient-rich shallow lake (Lake Taihu) are tested in this study. The results show that the dissolved oxygen concentrations in the lake fluctuate annually. They increase in autumn and winter with a peak value of 14.19 mg center dot L-1 in winter, and decrease in spring and summer with a trough value of 6.40 mg center dot L-1 in summer. Gross primary production (GPP), ecosystem respiration (R), and net ecosystem production (NEP) increase in summer, with their peak values in late summer and autumn, and decrease in winter and spring. Mean values of GPP, R and NEP are 1.75 +/- 0.06 (Mean +/- SE), 1.52 +/- 0.05, and 0.23 +/- 0.03 g O-2 m(-3)center dot d(-1), respectively. It is also found that water temperature and surface irradiance are the best predictors of GPP and R, while water temperature (wind speed) has a significantly positive (negative) relationship with NEP. The findings in this study suggest that Lake Taihu is a net autotrophic ecosystem, and water temperature and surface irradiance are the two important drivers of lake metabolism.
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