中国土壤重金属(Pb和Cd)沉降临界负荷区划
首发时间:2009-06-12
摘要:用稳态法确定了中国土壤的重金属Pb和Cd沉降临界负荷,结果表明我国土壤临界负荷明显呈现东南高、西北低的分布特征。我国东南部地区普遍能够接受大于1.0 g•hm-2•a-1的大气Pb沉降和大于0.1 g•hm-2•a-1的Cd沉降,原因是栽培植被和天然植被的生产力较高。该地区又可以分为南北两部分,南部由于土壤风化速率低和降水量(径流量)高,相应地能够接受比北方更高的重金属沉降。我国西北部地区普遍植被生产力较低,同时风化速率较高,因此土壤临界负荷较低,Pb的小于1.0 g•hm-2•a-1,Cd的小于0.1 g•hm-2•a-1。
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Mapping critical loads of heavy metal (Pb and Cd) deposition for soil in China
Abstract:Critical loads of Pb and Cd of Chinese soils were estimated through the steady state method. Results showed that the ctitical loads were obviusly higher in the southeast China and lower in the northwest. It could commonly accept atmopspheric deposition of Pb higher than 1.0 g•hm-2•a-1 and Cd higher than 0.1 g•hm-2•a-1 in the southeast, where the productivity of both cultivated vegetations and natural vegetations are reletively high. The ctitical loads were even higher in the south part of the southeast China than in the north part because of the lower soil weathering rate and the higher precipitation/runoff amount. Due to the low productivity of vegetation and high weathering rate of soil, the critical loads were lower than 1.0 g•hm-2•a-1 for Pb and 0.1 g•hm-2•a-1 for Cd in the northwest China.
Keywords: environmental science critical loads soil heavy metal Pb Cd
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No.3311322269124479****
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