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Evidence for Nonstomatal Uptake of Hg by Aspen and Translocation of Hg from Foliage to Tree Rings in Austrian Pine
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-01-11 00:00:00 , DOI: 10.1021/acs.est.7b04468 Jennifer Arnold 1 , Mae Sexauer Gustin 1 , Peter J. Weisberg 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-01-11 00:00:00 , DOI: 10.1021/acs.est.7b04468 Jennifer Arnold 1 , Mae Sexauer Gustin 1 , Peter J. Weisberg 1
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To determine whether trees are reliable biomonitors of air mercury (Hg) pollution concentrations were measured in bark, foliage, and tree rings. Data were developed using 4-year old Pinus and Populus trees grown from common genetic stock in Oregon and subsequently transferred to four air treatments differing in gaseous oxidized mercury (GOM) chemistry and total gaseous Hg (TGM) concentrations. Soil of a subset of trees was spiked with HgBr2 in solution to test for root uptake. Results indicate no significant effect of the soil spike or GOM compounds on tree tissue Hg concentrations. TGM treatment had a significant effect on Pinus and Populus foliage, and Pinus year 5 growth ring concentrations. Populus foliar Hg concentrations were highest in the exposure where 24 h TGM concentrations were highest, indicating the importance of the nonstomatal pathway for uptake. Pinus tree ring concentrations were correlated to day time TGM concentrations suggesting Hg accumulation into tree rings is by way of the stomata and subsequent translocation by way of phloem. Populus leaves and Pinus rings can be used as biomonitors for TGM concentrations over space. However, the use of trees as temporal proxies requires further investigation due to radial translocation observed in active sapwood tree rings.
中文翻译：
白杨非气孔吸收汞以及汞从叶向树轮的迁移的证据
为了确定树木是否是可靠的空气汞（Hg）生物监测器，对树皮，树叶和年轮中的污染浓度进行了测量。使用俄勒冈州常见遗传种群中生长的4年龄松树和杨树开发数据，随后将其转移到气态氧化汞（GOM）化学和气态总汞（TGM）浓度不同的四种空气处理中。用溶液中的HgBr 2掺入一部分树木的土壤，以测试根吸收。结果表明，土壤加标或GOM化合物对树木组织中的汞浓度无显着影响。TGM处理对松树和杨树叶子以及松树有显着影响第5年的年轮浓度。胡杨叶Hg浓度最高，而24 h TGM浓度最高，表明非气孔途径对摄取的重要性。松树年轮浓度与日间TGM浓度相关，表明汞通过气孔积累到树轮中，随后通过韧皮部移位。杨叶和松树环可用作空间中TGM浓度的生物监测器。然而，由于在活动边材树木年轮中观察到放射状易位，因此使用树木作为时间代理需要进一步研究。
更新日期：2018-01-12
中文翻译：
白杨非气孔吸收汞以及汞从叶向树轮的迁移的证据
为了确定树木是否是可靠的空气汞（Hg）生物监测器，对树皮，树叶和年轮中的污染浓度进行了测量。使用俄勒冈州常见遗传种群中生长的4年龄松树和杨树开发数据，随后将其转移到气态氧化汞（GOM）化学和气态总汞（TGM）浓度不同的四种空气处理中。用溶液中的HgBr 2掺入一部分树木的土壤，以测试根吸收。结果表明，土壤加标或GOM化合物对树木组织中的汞浓度无显着影响。TGM处理对松树和杨树叶子以及松树有显着影响第5年的年轮浓度。胡杨叶Hg浓度最高，而24 h TGM浓度最高，表明非气孔途径对摄取的重要性。松树年轮浓度与日间TGM浓度相关，表明汞通过气孔积累到树轮中，随后通过韧皮部移位。杨叶和松树环可用作空间中TGM浓度的生物监测器。然而，由于在活动边材树木年轮中观察到放射状易位，因此使用树木作为时间代理需要进一步研究。
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