中文摘要：

使用USES-LCA模型,对连续10多年过量使用化肥和农药的华北高产粮区农田系统进行了潜在生态毒性评估。结果表明,虽然潜在的人体毒性表现不明显,但1997和2007年小麦-玉米轮作的潜在水体毒性分别是225.15、261.08、308.24和303.45 kg1,4-DCBeq;土壤毒性分别是3.12、2.76、3.55和3.24 kg1,4-DCBeq,都呈正增长趋势,以潜在水体毒性表现最为明显。虽然农药对环境的实际威胁还需进一步证实,但严格禁止高毒农药的使用,规范农药的施用量和使用方式已经刻不容缓;与此同时,必须加强农业生态毒性评价体系和生态污染防控机制研究,这样才能促进农业的可持续发展。

英文摘要：

Using USES-LCA model,we developed an ecotoxicity potentials assessment for the high-yielding cropland systems which had been over used fertilizers and highly toxic pesticides for more than 10 years.The results showed： the performance of potential human toxicity was not obvious,but the potential freshwater toxicities of winter wheat and summer maize were 225.15,261.08,308.24 and 303.45 kg1,4-DCBeq respectively,at the same time,the potential terrestrial toxicities were 3.12,2.76,3.55 and 3.24 kg1,4-DCBeq respectively,both of which showed positive growth trend.Although the active threats of pesticides on the environment need to be verified further,prohibiting the use of highly toxic pesticides strictly,regulating the amount and usage of pesticides are urgent presently.At the same time,in order to keep the sustainable development of agriculture,researching agro-ecological toxicity evaluation system and ecological pollution prevention and control mechanism need to strengthen further.