生态学杂志2013，Vol.32Issue(6)：1551-1556,6.
除草剂百草枯对浮萍科不同植物的毒性效应比较
Toxic effects of herbicide paraquat on different species of Lemnaceae
摘要
Abstract
To explore the toxic effects of herbicides on different species of Lemnaceae,the median inhibition concentration (IC50) and chronic value (ChV) of paraquat to Spirodela polyrhiza,Landoltia punctata,and Lemna minor were measured,with the acute and chronic toxic effects of paraquat on these three Lemnaceae species compared.After treated for 96 hours,the IC50 value of paraquat to S.polyrhiza,L.punctata,and L.minor was 17.37,6.16,and 4.75 μg · L-1,respectively,and there existed significant differences among the acute toxicity (P＜0.05).The chlorophyll content of the three species all decreased significantly with increasing paraquat concentration,and after treated for four days,a significant negative correlation was observed between the chlorophyll content and paraquat concentration (P＜0.05).The ChV of paraquat to S.polyrhiza was 3.050 μg · L-1,and while that to both L.punctata and L.minor was 0.964 μg ·L-1.However,in light of frond features,the ChV of paraquat to S.polyrhiza was 10.780 μg ·L-1,while that to L.minor was only 3.410 μg · L-1,implying that the chronic toxic effect of paraquat to L.minor,whether from the viewpoint of frond features or chlorophyll content,was greater than that to S.polyrhiza.Therefore,under the treatment of paraquat,the three species of Lemnaceae demonstrated obvious plant taxonomy effect,dose effect,and time lag effect.关键词
浮萍科/百草枯/半数抑制浓度/慢性值/毒性效应Key words
Lemnaceae/ paraquat/ IC50/ chronic value/ toxic effect分类
农业科技引用本文复制引用
王林林,张光富,何谐,葛峰,周军英..除草剂百草枯对浮萍科不同植物的毒性效应比较[J].生态学杂志,2013,32(6):1551-1556,6.基金项目
国家环保部公益性行业科研专项(201009033)、国家基础科学人才培养基金项目(J1103507、J1210025)和江苏高校优势学科建设工程项目资助. （201009033）
