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

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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 δ¹³C_TIC) 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.

Key words： eutrophication carbon burial inorganic carbon synergistic changes Yilong Lake

Received: 24 February 2023

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	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

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LI Ping,CHEN Guang-jie,KONG Ling-yang等. Synergistic changes of organic and inorganic carbon burial in response to eutrophication in Yilong Lake over the past 100 years[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(10): 5390-5402.

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