[Estimating of decadal accumulation rates of heavy metals in surface rice soils in the Tai Lake region of China].
Estimation of decadal accumulation of some heavy metals in surface rice soils from the Tai Lake region, southern Jiangsu Province, China was made by means of calculating the monitoring data and/or analysis data of the archived soil samples. For the last decade, the estimated annual accumulation rate for Cu or Zn, Pb and Cd was 0.3-1 mg.(kg.a)-1, 0.2-1 mg.(kg.a)-1 and 0.3-3 micrograms.(kg.a)-1 respectively, the apparent pollution loading was, therefore, respectively 0.5-1 kg.(hm2.a)-1, 0.5-1.0 kg.(hm2.a)-1, 0.5-3.0 kg.(hm2.a)-1 [symbol: see text] 0.8-10 x 10(-3) kg.(hm2.a)-1. The accumulation rate for the content of available form was shown to be greater than that of total content. The non-point source pollution marked bigger contribution to the total annual loading for the Pb and Cd than the other source pollutions, while the Cd loading was prominently higher than those reported in Europe. These results may indicate that the food safety in this region may be constrained by the soil pollution of these heavy metals at high accumulation rates.
Li
Lianqing
L
Institute of Resources, Ecosystem and Environment for Agriculture, Nanjing Agricultural University, Nanjing 210095, China.
Pan
Genxing
G
Zhang
Pingjiu
P
Cheng
Jiemin
J
Zhu
Qiuhua
Q
Qiu
Duosheng
D
D002104:Cadmium / Q000032:analysis; D002681:China; D003300:Copper / Q000032:analysis; D005618:Fresh Water; D007854:Lead / Q000032:analysis; D019216:Metals, Heavy / Q000032:analysis*; D012275:Oryza; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D015032:Zinc / Q000032:analysis
D019216:Metals, Heavy; D012987:Soil; D012989:Soil Pollutants; D002104:Cadmium; D007854:Lead; D003300:Copper; D015032:Zinc