沉湖130年来湖泊沉积物有机碳、氮稳定同位素变化及其环境指示意义

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Abstract Based on the analysis of total organic carbon(TOC), total nitrogen(TN), organic carbon isotope(δ¹³C_org) nitrogen isotope(δ¹⁵N), and the results of dating(²¹⁰Pb, ¹³⁷Cs) from sediment core collected in the center of the Chen Lake in 2020, the source of organic matter in sediments was identified and the evolution process of lake ecosystem during the past 130 years under the influence of human activity was analyzed. These results showed that the average sedimentary rate was 0.52cm/a, showing a slowly increasing tendency. The contents of TOC and TN ranged from 0.89% to 3.65% and 0.04% to 0.20%, respectively. The values of δ¹³C and δ¹⁵N ranged from -29.34‰ to -26.13‰ and 1.67% to 5.48‰, respectively. The rapid increase of TOC and TN in the depth of 38~26cm corresponded to the period of population growth and lake reconstruction projects around the Chen Lake during 1970~1990. The organic matter in sediments was a mixed source, including soil organic matter, terrestrial C3 plants and aquatic vascular plants. Soil organic matter and terrestrial C3 plants dominant the sedimentary organic compositions. After the 1980, due to the weakening of lake hydrodynamic caused by human activities, the contribution rate of aquatic vascular plants to sediment organic matter in wetland increased. Hence, in the future, more attention should be paid to the impacts of human activities on the lake ecological environment for controlling soil erosion and reasonably regulating the hydrological conditions of lakes.

Key words： Chen Lake stable isotopes of carbon and nitrogen organic matter environmental evolution human activity

Received: 15 July 2022

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X141

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	Articles by authors
	ZHANG Ya
	LIU Li
	LI Peng
	HU Yuan-ping
	LI Lin-jing
	SU Ye-wang
	XING Xin-li
	FENG Jiang
	YE Ting

Cite this article:

ZHANG Ya,LIU Li,LI Peng等. Changes of organic C and N stable isotope and their environmental implication during the past 130 years of Chen Lake[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(3): 1307-1316.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I3/1307

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