Soil Heavy Metal Pollution

Select

The feature research of heavy metals in vegetable

Li Qilin, Liu Guangde, Huang Yun, Wei Chaofu

Chinese Agricultural Science Bulletin 2004, 20 (3): 40-40. DOI: 10.11924/j.issn.1000-6850.040340

Abstract + (1711) PDF (1048987KB) (720)

The differences of the contents of heavy metals are obvious in the different vegetable kinds and breeds. The vegetable breeds which average contents of heavy metal are high have three-coloured amaranth, asparagus lettuce, raw vegetable, onion; which variable coefficient of heavy metals are big have cabbage, hot pepper, onion. The contents of many heavy metals in leaf vegetable are bigger than in fruit and vegetable. The correlation analysis in the different vegetable kinds shows that the correlation degree is bigger in leaf vegetable than in fruit and vegetable. The correlation analysis of heavy metals displays the correlation degree of the different vegetable breeds is bigger in asparagus lettuce than in cabbage than in kidney bean than in onion than in hot pepper than in raw vegetable than in three-coloured amaranth. The classify analysis of heavy metals shows that the coordination and formal of heavy metals are large differences in the different vegetable breeds, and the contents of heavy metals of same vegetable breeds have similarity. We find that the main vegetable breeds that beyond standards are leaf vegetable, and the areas that beyond standards main are in the outskirts of a town, and the main heavy metals that beyond standards are Pb Cd.

Select

Factors of Influencing Soil-nitrogen Pollution Load of Sloping Field in the Dian Lake Watershed

Zhang Naimingm, Zhang Yujuan, Chen Jianjun, Li Chengxue

Chinese Agricultural Science Bulletin 2004, 20 (5): 148-148. DOI: 10.11924/j.issn.1000-6850.0405148

Abstract + (1710) PDF (1113467KB) (770)

Simulated experiment was used in this experiment to study the effects of soil factors on the farmland nitrogen losses and its concentration under artificial rainfall and natural rainfall. A number of soil and landscape factors were taken into account such as slope gradient, plant covers, fertilizers’ application performances as well as rainfall intensity. The result showed: the concentration of total nitrogen (TN) and the loss rate increased when the slope gradient became high; there has no significant difference in TN concentration between under artificial rainfall and under natural rainfall, TN concentration in runoff is smaller with the courser soil texture; and obviously lower with wheat planting than without covering, among which the loss decreased 11.80~238.46kg/hm2; in condition of the same N application account, diffuse application of fertilizer caused more nitrogen loss than cave application.

Select

Investigation on accumulating ability of agricultural products to soil heavy metal

Huang Yun, Liu Guangde, Li Qilin, Zhao Zhongjin, Xie Jinfeng

Chinese Agricultural Science Bulletin 2004, 20 (6): 285-285. DOI: 10.11924/j.issn.1000-6850.0406285

Abstract + (1713) PDF (1287950KB) (913)

Collection 314 samples of citrus fruits, rice, three-colored amaranth, asparagus lettuce, green Chinese onion, French bean, hot pepper, wild cabbage and the soil, test the content of heavy metal Pb, Cd, Hg and As in these samples. By direction difference analysis and clustering analysis, the accumulating ability of citrus pulp, wild cabbage, hot pepper, French bean is very small in the 8 kinds of agricultural products. It is fit to plant citrus pulp, wild cabbage, hot pepper, French bean in the soil where there is higher content of Pb, Cd, Hg and As.

Special issue