Synergistic changes of organic and inorganic carbon burial in response to eutrophication in Yilong Lake over the past 100 years
LI Ping1,2, CHEN Guang-jie1, KONG Ling-yang1, HUANG Lin-pei1, WANG Xu1, YANG Guan-shao1, SUO Qi1, LI Jing1, WANG Lu1, HAN Qiao-hua1, ZHOU Qi1, GUO Wen1, LI Rui1, ZHANG Tao1
1. Yunnan Key Laboratory of Plateau Geographical Processes and Environmental Changes, Faculty of Geography, Yunnan Normal University, Kunming 650500, China; 2. School of Resource and Environment, Xichang University, Xichang 615013, China
Abstract：Carbon burial and its dynamic change in lakes play an indispensable role in the global carbon budget and residual land sink. Carbon sequestration in hard water lakes and other inland waters is deemed to be an important sink process owing to carbonate weathering coupled with aquatic photosynthesis, which stimulates continuous organic carbon and inorganic carbon burial. However, existing assessment paradigms are mainly based on organic carbon, lacking a comprehensive understanding of inorganic carbon burial and its synergistic change with organic carbon. Here, the history of carbon burial fluxes over the past century through multi-proxy and spatial sediment surveys of Yilong Lake in the karst area of Yunnan province was analyzed, in combination with 210Pb and 137Cs chronological profiles, for uncovering the patterns and mechanisms of synergistic changes in organic and inorganic carbon burial. The results showed that the allochthonous primary productivity in Yilong Lake has been significantly elevated due to nutrient input caused by watershed cultivation (e.g., enrichment of sediment nitrogen and phosphorus contents), with sediment pigment content increasing from 7.02μg/g in~1900 to 38.99μg/g in~2020. The accumulation rates of both organic and inorganic carbon showed a continuous trend of increasing and a high degree of synergistic changes (r=0.99,P<0.001). Regression analysis further showed that algal biomass was the main factor in driving the accumulation rates of both organic and inorganic carbon (R2=0.33~0.91, P<0.001). This indicated that algal photosynthesis and the "biological carbon pump" effect have largely controlled the processes of carbon burial. With the general decline of allochthonous watershed export (as evidenced by a decline of sediment magnetic susceptibility signal and C:N ratio) and a continuous increase of algal biomass, more allochthonous organic carbon can be transformed to authigenic carbonates (as evidenced in a sustained depletion of δ13CTIC) during the decaying and mineralization of organic matters, enhancing the synergistic increase in both organic and inorganic carbon burial. These results suggested a highly synchronous increase in the long-term fluxes of organic and inorganic carbon burial in response to lake eutrophication, highlighting the increasingly coupled processes in the burial of organic and inorganic carbon, and an increased rate in sediment carbon cycling and recycling. Therefore, under the continuing impact of human activities and climate change, refined assessments of carbon sink in karst lakes need to highlight the pattern of inorganic carbon cycling and its dynamic role in the flux and stock of terrestrial carbon.
李平, 陈光杰, 孔令阳, 黄林培, 王旭, 杨关绍, 索旗, 李静, 王露, 韩桥花, 周起, 郭雯, 李蕊, 张涛. 近百年来异龙湖有机碳和无机碳埋藏响应水体富营养化的协同变化特征[J]. 中国环境科学, 2023, 43(10): 5390-5402.
LI Ping, CHEN Guang-jie, KONG Ling-yang, HUANG Lin-pei, WANG Xu, YANG Guan-shao, SUO Qi, LI Jing, WANG Lu, HAN Qiao-hua, ZHOU Qi, GUO Wen, LI Rui, ZHANG Tao. Synergistic changes of organic and inorganic carbon burial in response to eutrophication in Yilong Lake over the past 100 years. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(10): 5390-5402.
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