| This article is about the investigation and assessment of heavy metal and OCPs remnant in the soil of forest, planting and planted ginseng from five ginseng cultivation bases in Fusong, Changbai, Ji'anjingyu and Dunhua, these countries located east mountain area of Jilin province. And in the same time the change of soil microflora, which was one of the most important reasons that affect one crop succession of ginseng, was discussed, so that the Ginseng products quality were increased ,and scientific basis and reference to establish Good Agricultural Practice of Medicinal Plants and Animals (GAP) of Ginseng production were provided.1.This study was about the detection of the remnant of OCPs (BHC, DDT,PCNB) from Ginseng cultivation bases in east mountain area, and in the same time the changes of bacteria, actinomyces, fungus population were investigated.2.The detection result of OCPs remnant in the experimental soil was:BHC 0.0004~ 0.1746mg/kg, 0.002~0.0185mg/kg; PCNB 0.0003~0.6456mg/kg, the average value was 0.0062~ 0.0956mg/kg,we could detect BHC and PCNB in all of the 57 monitoring points; DDT 0.0001-0.2058mg/kg,the average value was 0.0004~0.0261mg/kg.We could detect DDT in all the soil samples from Changbai and Dunhua, and the average value of DDT in the samples from Fu Song, Ji'an and Jingyu was 66.7%,88.9% and 83.3% respectively.3.The contents of BHC, PCNB, DDT in forest soil were all below slight pollution level (<0.025mg/kg) .The PCNB remnant in planting soil was observably higher than that in planted soil. 25% of the total monitoring points were slightly polluted (0.025-0.250mg/kg) ,and the point A3B22, A4B22 were seriously polluted (>0.500mg/kg ). The highest pollution grade of BHC was slight pollution. 10% of the total monitoring points reached slight pollution level. The results of BHC and PCNB indicated that the Ginseng farmers used BHC and PCNB in the past, and now they are still using them in some areas o The contents of DDT in soil of different utilization were all low, only one monitoring points A1b33's content of DDT was slightly polluted o So the DDT remnant in soil resulted from the prevention and cure of forest insect pest, few of the DDT pollution were caused by human activities.4.The heavy metal remnant result of the experimental soil showed that the BHC pollution of monitoring points A1B23,A1B32, A2B21,A2B33, A3B23, A3B24 were slight pollution; the PCNB pollution of monitoring points A1B32, A2B31, A3B21,A3B2, A3B23, A3B33,A3B34, A4B21, A4B32, A4B33, A5B23, A5B24 were slight pollution; but the PCNB pollution of A4B22m A3B24 were serious pollution; the DDT pollution of AiB33 was slight pollution This indicated that the farmersof points A4B22, A3B24 are still using DDT although our country had banned it.5.The result of heavy metal remnant in the experimental soil showed that the content of Gr, As, Pb, Cd, Hg in soil of the five areas was 6.34 ~ 27.59mg/kg, 3.38 ~ 10.72mg/kg, 8.95 ~ 19.42mg/kg, 0.096 ~ 0.248mg/kg, 0.011 ~ 0.041mg/kg, and the average value was 14.73mg/kg, 6.81mg/kg, 13.60mg/kg, 0.156mg/kg, 0.022mg/kg respectively.6.The single factor pollution index assessment result of heavy metal remnant in the experimental soil showed that the heavy metal Pi<1,so they were free from heavy metal pollution, because they were distant from heavy metal pollution source.7.The synthetic pollution index assessment result of heavy metal and OCPs remant in the experimental soil showed that the soil environment quality of Dunhua was first degree; the ones of Fu Song and Ji'an were second degree, so the soil of these areas accorded with the request of no social effects of pollution production of GAP. The soil environment quality of Changbai and Jingyu were three degree, but it only exceeded the standard a little so it could be ignored. What's more the single factor pollution index showed that the PCNB pollution of ten monitoring points in this two areas were slight pollution, one point was serious pollution. Therefore, in order to set up Ginseng base in this area, more monitoring points... |
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