Research on residues of organochlorine pesticides in arable land of Liaocheng and agricultural functions | 聊城市耕地土壤有机氯农药残留与农业功能定位研究

Chinese. 为掌握聊城市耕地土壤有机氯农药残留状况，确定耕地的农业功能及其对粮食质量的影响，将聊城市耕地分为136个采样点，调查有机氯农药六六六（HCHs）与滴滴涕（DDTs）的残留量。采用国家《农产品安全质量无公害蔬菜产地环境要求》和《绿色食品产地环境技术条件》作为评价标准，采用单因子指数和综合指数为评价方法进行污染评价。研究表明，聊城市土壤未受HCHs污染，但个别样点DDTs严重超标，且残留量在区域间存在着明显差异。以GIS为操作平台显示聊城市有机氯农药空间分布状况，并对区域耕地进行了功能定位。定位结果显示，聊城市东部和南部土壤质量最优，适宜种植绿色食品；中部和西部适宜种植无公害蔬菜；观察种植区主要位于聊城市西北部；污染区主要位于临清市。

English. In order to analyze the residues of organochlorine pesticides (OCPs) of arable land in Liaocheng, determine the agricultural function and it’s effect on food quality, 136 surface soil samples were collected and the residues of OCPs including HCHs and DDTs were monitored. “Safety qualification for agricultural product-environmental requirements for origin of non-environmental pollution vegetable” and “Environmental technical terms for green food production area” were chosen to evaluate the soil quality. Single index and integrated index were used during the evaluation. The study showed that all land has’nt been polluted by HCHs, but the residues of DDTs in a few samples has exceeded the criteria seriously, and the evident difference of residues exists in different regions. Geography information system was used to show the spatial distribution of HCHs and DDTs, and to determine the agricultural functional localization. Results showed that the soil in the east and south of Liaocheng is the best to produce green food; non-environmental pollution vegetable can be produced in the middle and west; the observed growing region lies in the northwest; and pollution area mainly lies in Linqing City.