A grass (Italian rye grass) experiment with complete design of three factors (Hg, grass and exposure) andtwo levels (with and without the factor tested) was carried out in Goteborg, Sweden from May to September,1995, ...A grass (Italian rye grass) experiment with complete design of three factors (Hg, grass and exposure) andtwo levels (with and without the factor tested) was carried out in Goteborg, Sweden from May to September,1995, toward understanding the effect of mercury deposition on plant Hg conteot and its distribution. It hasbeen foulld 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 effectsseem to be condned only within the above-ground parts of grass plant. Estimate has been made to makeclear of the contributions of different pathways to Hg content and total Hg load in the upper part of grass.Results showed that the coDtribution 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 Hgconcentrations. The increment of Hg load in the upper part of grass plant caused by Hg deposition duringan interval of two weeks varied between O.o1~O.o7 pg pot-1, contributing to 17%~48% of the total Hg loadin grass plant exposed.展开更多
文摘A grass (Italian rye grass) experiment with complete design of three factors (Hg, grass and exposure) andtwo levels (with and without the factor tested) was carried out in Goteborg, Sweden from May to September,1995, toward understanding the effect of mercury deposition on plant Hg conteot and its distribution. It hasbeen foulld 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 effectsseem to be condned only within the above-ground parts of grass plant. Estimate has been made to makeclear of the contributions of different pathways to Hg content and total Hg load in the upper part of grass.Results showed that the coDtribution 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 Hgconcentrations. The increment of Hg load in the upper part of grass plant caused by Hg deposition duringan interval of two weeks varied between O.o1~O.o7 pg pot-1, contributing to 17%~48% of the total Hg loadin grass plant exposed.
