The co-metabolism effect of lake sediments input pattern of labile carbon
MA Jie1,2,5, WU Xiao-dong3, SHI Rui-jie2, YAN Xing-cheng4, JI Ming2, XU Xiao-guang2, WANG Guo-xiang2, DANG Xin-yi2, JIANG Yan-ni2, YE Zi2
1. School of Geography Science, Nanjing Normal University, Nanjing 210023, China; 2. School of Environment, Nanjing Normal University, Nanjing 210023, China; 3. College of Urban and Environmental Sciences, Hubei Normal University, Huangshi 435002, China; 4. Sorbonne University, Paris 75005, France; 5. Sino-Japan Friendship Center for Environmental Protection, Beijing 100029, China
Abstract：The microcosm system was constructed to analyze the CO2 release during the metabolism processes of organic components in the mixed treatment by using the stable carbon isotope tracer. The influence of the labile carbon addition on the decomposition process of organic carbon in lake sediments was also explored. The results showed that: Compared with the control, the CO2 emissions in the treatment with labile carbon addition increased by 45.49% for single addition treatment (ST), 52.61% for repeated addition treatment (RT) and 57.65% for continuous addition treatment (CT), respectively. The CO2 emissions from sediments in each treatment increased by 16.92% (ST), 24.26% (RT) and 27.40% (CT) than the control, respectively. Although the positive co-metabolic effect (promoting the decomposition of organic carbon in sediments) was observed in each treatment under different addition modes, the net organic carbon content increased at the end of culture. Glucose promoted the mineralization of organic carbon in sediments, but had little effect on its own metabolism. Considering that the outbreak frequency and range of algae in eutrophic lakes are further increased, the co-metabolism effect triggered by the continuous input of algae organic detritus cannot be ignored, which weakens the function of carbon sink of lake sediments.
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MA Jie, WU Xiao-dong, SHI Rui-jie, YAN Xing-cheng, JI Ming, XU Xiao-guang, WANG Guo-xiang, DANG Xin-yi, JIANG Yan-ni, YE Zi. The co-metabolism effect of lake sediments input pattern of labile carbon. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(1): 396-400.
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