典型冰川退缩区铅的来源、累积及历史沉降——以青藏高原海螺沟冰川退缩区为例

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Abstract Given the advantage of the timing of glacial retreated regions, we systematically studied centennial trends of lead (Pb) to demonstrate the sources, accumulation, distribution, and atmospheric deposition in the terrestrial ecosystem of glacial retreated regions, eastern Qinghai-Tibet Plateau. We comprehensively determined the concentration of lead and other trace elements in soil and vegetation of glacier retreated regions by inductively coupled plasma mass spectrometry (ICP-MS), and quantified the temporal patterns of lead concentration and storage, and then analyzed the potential sources by principal component analysis (PCA), and finally estimated the accumulation rate of historical lead deposition in soils. The results showed that the atmospheric deposition of lead mainly accumulated in O-horizon, and both lead concentration and storage in O-horizon increased with the time of glacier retreated. This suggests that forest soils act as an important atmospheric lead sink in the terrestrial ecosystems. For the aboveground component of vegetations, the lead concentration in branches and barks were the highest, while the lead concentration in trunk was the lowest. The Pb pool size of vegetation showed a positive correlation with the vegetation biomass production. More in detail, the vegetation had the higher uptake rate of lead during the growth period, while decreased distinctly during the old period time. Briefly, the Pb mass in the whole ecosystems increased with the increasing retreated time, and reached the plateau in 1936spruce top community sampling site. The PCA results displayed that 57% of lead in organic soil was derived from the atmospheric deposition of anthropogenic Pb. Further back trajectories analysis suggested that Southwest China and South Asia (India, Bangladesh, etc.) are the main potential sources of lead in Gongga Mountain. Finally, we estimated the centennial average of accumulative rate of lead deposition from atmospheric sources in the glacial retreat area was (8.87±3.55) mg/(m²·a), significantly lower than values in the economically developed regions of China. Overall, our study provides a typical example and data basis for exploring the source, distribution, and accumulation of lead in terrestrial ecosystems, and contributes to understand the impact of future global changes on Pb biogeochemical cycling.

Key words： glacial retreated area lead sources accumulation processes historical deposition

Received: 04 January 2021

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	CHEN Pei-jia
	WANG Xun
	WANG Ding-yong

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CHEN Pei-jia,WANG Xun,WANG Ding-yong. Lead sources, accumulation and historical deposition in typical glacial retreat area: A case study of Hailuogou glacial retreat area, Qinghai-Tibet Plateau[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(8): 3704-3713.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I8/3704

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