环境条件对除草剂莎稗磷降解的影响

环境条件影响莎稗磷在土壤中的降解速度 :随着土壤温度的升高和含水量的增加 ,莎稗磷降解速度加快 ,在温度为 2 0、30和 4 0℃下 ,经过 10 d,莎稗磷的降解率分别为10 .4 %、2 6 .7%和 37.6 % ;在相对含水量为 30 %～ 110 %的土壤中 ,15d后莎稗磷降解 4 5.0 %～ 6 8.4 %。土壤中有机质能促进莎稗磷的降解 ,在有机质含量为 3.35%和 0 .55%的两种土壤中 ,莎稗磷的半衰期分别为 11d和 15d。莎稗磷在碱性土壤中比在酸性土壤中降解快 ,在偏酸性 (p H值为 6 .0 1)土壤中的半衰期为 2 2 d,在偏碱性 (p H值为 7.98)土壤中半衰期为 15d.

Effect of Environmental Conditions on Degradation of Anilofos in Soil

The degradation rate of anilofos in soil varied with the environmental conditions. When tempera- ture was 20, 30, 40℃ separately, the degradation rates of anilofos was 10. 4% , 26. 7% and 37. 6% , respec-tively; The degradation rate increased from 45. 0% to 68. 4% when soil water content varied from 30% to 110%. The half-lives of anilofos was 11 d and 15 drespectively, in soils with organic mat ter contents 3. 35% and 0. 55%. When soil pH values were 6. 01 and 7. 98, the half-lives of anilofos were 22d and 15d, respec-tively. These results indicated that organic matter,water contents and temperature of soil enhanced anilofos degradation and the degradation rate of the chemical in alkaline soil was higher than in acid soil.