Pedosphere 7(2): 155--164, 1997
ISSN 1002-0160/CN 32-1315/P
©1997 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effect of mercury deposition on mercury content and distribution in rye grass |
| WEI Shi-Qiang1,2, J. SOMMAR O. LINDQVIST2 and XIAO Zi-Fan2 |
1 College of Environment and Resource, Southwest Agricultural University, Chongqing 630716 (China);
2 Department of Inorganic Chemistry, Chalmers University of Technology and University of Göteborg, Götebong 41296 (Sweden) |
| ABSTRACT |
| A grass (Italian rye grass) experiment with complete design of three factors (Hg, grass and exposure) and two levels (with and without the factor tested) was carried out in Göteborg, Sweden from May to September, 1995, toward understanding the effect of mercury deposition on plant Hg content and its distribution. It has been found that besides the two general pathways of Hg absorption, i.e. root uptake and foliar absorption, mercury deposition can also significantly increase Hg content and total load in grass plant. Such effects seem to be confined only within the above-ground parts of grass plant. Estimate has been made to make clear of the contributions of different pathways to Hg content and total Hg load in the upper part of grass. Results showed that the contribution of Hg deposition accounted for 27%~32% of Hg content in the above-ground parts of grass plant without adding Hg to the soil, decreasing with the increase of soil and/or air Hg concentrations. The increment of Hg load in the upper part of grass plant caused by Hg deposition during an interval of two weeks varied between 0.01~0.07 μg pot-1, contributing to 17%~48% of the total Hg load in grass plant exposed. |
| Key Words: absorption, Hg content and distribution, mercury deposition, rye grass |
| Citation: Wei, S. Q., Lindqvist, O. and Xiao, Z. F. 1997. Effect of mercury deposition on mercury content and distribution in rye grass. Pedosphere. 7(2): 155-164. |
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