[Change of available pool of heavy metals in paddy soils under human land use impacts from the Taihu Lake region, Jiangsu Province, China].
A number of representative farms under various human land uses were selected through a general survey in the Taihu Lake region, Jiangsu Province, China. The land uses covered vicinity of smelt industry and township industry, long history of high-yielding performance, long term fertilization treatments. Top layers of the paddy soils were sampled for analysis of available pool of heavy metals. A prevalent trend of increasing availability was observed of heavy metals by a degree of 30% up to 200% in the soils under these human impacts as compared with that under relative conserved conditions. This increasing trend was most remarkably exhibited in the top sub-layer of the paddy soils. The highest rise of the available pool largest was found in those under smelt industry impact and under long term chemical fertilization alone. The result showed that available pool of surface soil Cu and Pb under these impacts were 7.96-2.15 mg.kg-1, 24.7-3.47 mg.kg-1 and 8.34-4.42 mg.kg-1, 9.01-4.95 mg.kg-1 respectively. The dramatic rise of the availability with the increasing trend of the total (as previously reported) might stand for contemporary soil environmental quality and, thus, require severe concerns for agriculture and food security in this rapidly developing region.
Li
Lianqing
L
Institute of Resources, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China. lianqingli1@hotmail.com
Zheng
Jinwei
J
Pan
Genxing
G
Tian
Fuqiang
F
Qiu
Duosheng
D
Xu
Xiangdong
X
Chu
Qiuhua
Q
D018556:Crops, Agricultural; D005308:Fertilizers; D019216:Metals, Heavy / Q000032:analysis*; D012275:Oryza / Q000254:growth & development*; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*
D005308:Fertilizers; D019216:Metals, Heavy; D012987:Soil; D012989:Soil Pollutants