土壤有机质垂直分布特征及其对短期植被更替的响应

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Abstract Typical soil profile samples were collected from depths ranging from 0 to 110cm in Beijing and Yunnan, China, over a period of approximately ten years of vegetation succession. The vertical distribution characteristics of soil organic carbon stable carbon isotope ratios (δ¹³C_org), total organic carbon, organic carbon density, O/C ratio, and C/N ratio in soil organic carbon were analyzed to investigate the response of soils at different depths to vegetation succession. The objective was to reveal the vertical distribution characteristics and stability patterns of soil organic matter. The study found that soil δ¹³C_org varied significantly across different regions and depths. Notably, the δ¹³C_org patterns in the deep soil profiles of Beijing and Yunnan were inversely related, with vegetation succession impacting the δ¹³C_org change rate at various soil depths. In the Beijing area, the δ¹³C_org change rate decreased with increasing soil depth following vegetation succession. Furthermore, the vertical distribution characteristics of total organic carbon, organic carbon density, soil organic matter polarity, and C/N ratio, as well as their responses to vegetation succession, differed markedly. Some typical profiles indicated that vegetation succession could enhance total organic carbon and soil organic matter polarity in deeper soil layers. The findings suggest that under the influence of varying latitudes, different vegetation covers, and distinct soil physical and chemical properties, the characteristics of soil organic matter are closely linked to distribution depth and short-term vegetation succession. These insights may provide a crucial basis for understanding the dynamic interactions between vegetation succession and the carbon cycle.

Key words： vegetation replacement soil organic matter stable carbon isotope ratio soil profile carbon cycle

Received: 28 January 2024

PACS:

X53

Corresponding Authors: 何霄嘉,研究员,hexj@acca21.org.cn E-mail: hexj@acca21.org.cn

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	SHEN Ya-ting
	ZHANG Wei
	HE Xiao-jia

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SHEN Ya-ting,ZHANG Wei,HE Xiao-jia. Vertical distribution characteristics of soil organic matter and its response to short-term vegetation succession[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(8): 4520-4529.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I8/4520

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