Distribution and influencing factors of vegetation mercury in major forest systems across the globe
LI Xin1, CHANG Shun-li1, WANG Xun2, YUAN Wei2, ZHANG Yu-tao3
1. College of Resources and Environmental Science, Xinjiang University, Urumqi 830046, China; 2. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; 3. Institute of Forest Ecology, Xinjiang Academy of Forestry, Xinjiang Tianshan Forest Ecosystem National Observation, Urumqi 830063, China
Abstract：Based on the studies on the global mercury cycling processes in forests over the last 20-year, this study aims to elucidate the vegetation mercury distribution and its influencing factors in major forest types globally through meta-analysis. Results showed that the descending order of mercury concentrations in vegetation (in terms of median value) was litterfall (38.9ng/g) > foliage (24.1ng/g) > root (18.5ng/g) > bark (13.2ng/g) > branch (12.0ng/g) > stem (3.1ng/g). Litterfall was highly significantly correlated with foliage Hg concentration (rho=0.747, p<0.01, rho: Spearman's correlation coefficient, depending on number of samples, hereafter), and a significant correlation (rho=0.265, P<0.05) between leaves and trunks, but no correlations among the rest of tissues (p>0.05). The above correlations are mainly controlled by the uptake of atmospheric elemental mercury by foliage and the upward transport from foliage to the xylem of trees. In addition, vegetation Hg concentrations in broadleaf evergreen forest leaves (median: 56.0ng/g, below) were higher than those in coniferous (25.5ng/g), broadleaf deciduous (23.0ng/g), and mangrove (18.6ng/g) forests. This is because the combined effects of stomatal conductance, stomatal number, leaf area and leaf longevity lead to the evergreen broadleaf forests with the greatest capacity for mercury enrichment. this study showed a significant inter-regional variation in vegetation Hg concentrations (e.g., up to range of 0.90~225ng/g). This can be attributed to the inter-regional differences in vegetation type and atmospheric mercury concentrations. This study provides important data and expanded our understanding to further quantify the global forest vegetation Hg pool and sink.
李鑫, 常顺利, 王训, 袁巍, 张毓涛. 全球主要森林系统中植被汞分布特征及其影响因素[J]. 中国环境科学, 2022, 42(4): 1884-1891.
LI Xin, CHANG Shun-li, WANG Xun, YUAN Wei, ZHANG Yu-tao. Distribution and influencing factors of vegetation mercury in major forest systems across the globe. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(4): 1884-1891.
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