Institute of Chemistry, University of Campinas, UNICAMP, P.O. Box 6154, 13083-970 Campinas, SP, Brazil.
Institute of Chemistry, University of Campinas, UNICAMP, P.O. Box 6154, 13083-970 Campinas, SP, Brazil.
Environ Pollut. 2015 Nov;206:605-10. doi: 10.1016/j.envpol.2015.08.010. Epub 2015 Aug 25.
The objective of this work was to assess the flux of atmospheric mercury transferred to the soil of the Amazonian rainforest by litterfall. Calculations were based on a large survey of published and unpublished data on litterfall and Hg concentrations in litterfall samples from the Amazonian region. Litterfall based on 65 sites located in the Amazon rainforest averaged 8.15 ± 2.25 Mg ha(-1) y(-1). Average Hg concentrations were calculated from nine datasets for fresh tree leaves and ten datasets for litter, and a median concentration of 60.5 ng Hg g(-1) was considered for Hg deposition in litterfall, which averaged 49 ± 14 μg m(-2) yr(-1). This value was used to estimate that in the Amazonian rainforest, litterfall would be responsible for the annual removing of 268 ± 77 Mg of Hg, approximately 8% of the total atmospheric Hg deposition to land. The impact of the Amazon deforestation on the Hg biogeochemical cycle is also discussed.
这项工作的目的是评估通过凋落物转移到亚马逊雨林土壤中的大气汞通量。计算是基于对发表和未发表的凋落物和亚马逊地区凋落物样本中 Hg 浓度数据的大量调查。基于位于亚马逊雨林的 65 个地点的凋落物数据，平均为 8.15±2.25 Mg ha(-1) y(-1)。从九个新鲜树叶数据集和十个凋落物数据集计算了平均 Hg 浓度，考虑到凋落物中 Hg 沉积的中位数浓度为 60.5 ng Hg g(-1)，平均为 49±14μg m(-2) yr(-1)。该值用于估计在亚马逊雨林中，凋落物每年将去除 268±77 Mg 的 Hg，约占大气 Hg 向陆地总沉积量的 8%。还讨论了亚马逊森林砍伐对 Hg 生物地球化学循环的影响。
