基于碳氮化学计量探究植被格局变化对土壤汞累积的影响

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Abstract To assess impacts of vegetation on the distribution and accumulation of mercury (Hg) in forest soils, we comprehensively determined the contents and stoichiometric relationships among Hg, carbon (C) and nitrogen (N) in forest soils of Hailuogou glacial retreated regions of the Gongga Mountain, Eastern Qinghai-Tibet Plateau. Results demonstrated the enhanced Hg accumulation in all decomposing litter due to the rapid loss of N and C mass during the initial stage of organic soil formation (at ten-year scale). However, the different Hg accumulation process existed between the pioneer broadleaf tree forest and the climax coniferous tree forests in the period of slow degradation processes of organic matter (at decadal to centennial scales). More in detail, the soil mercury concentration in the organic layer of coniferous forest (277.54±117.19ng/g) was significantly greater than that of deciduous forest (204.23±14.38ng/g); we observed the decreasing mercury concentration with the increasing organic soil depth in deciduous forests, while the nearly constant concentration in coniferous forests. These can be explained by the lower N content in coniferous forests than in broadleaf forests (2.11%±0.20% versus 2.64%±0.10%) which leading to the slow the coniferous litter degradation rate. In addition, Hg/C ratio distinctly decreased with the increasing C/N ratio in deciduous organic soils, but without profile trends in coniferous forest soils because of their largely different litter input characteristics and the Hg accumulation patterns.

Key words： glacier retreated area vegetation carbon and nitrogen stoichiometric ratio mercury accumulation

Received: 24 October 2022

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	YANG Lu-han
	WANG Xun
	WANG Ding-yong

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YANG Lu-han,WANG Xun,WANG Ding-yong. Effect of vegetation pattern change on soil mercury accumulation based on carbon and nitrogen stoichiometry[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(6): 2993-3001.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I6/2993

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