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通过黑土室外盆栽试验,研究了种植玉米和未种植条件下乙草胺在玉米生长苗期的残留变化规律及土壤微生物量碳的动态特征。研究表明:乙草胺在土壤中半衰期较短,土壤微生物活性是影响其降解的主要因素。但是,由于施用化肥极大地刺激了微生物活性,因而,乙草胺施用对土壤微生物量碳影响并不显著。然而,玉米的种植对土壤微生物量和土壤乙草胺残留数量有着显著的影响。种植玉米条件下土壤微生物量碳显著增加,同时,土壤中乙草胺残留量降低,说明种植玉米有助于微生物活性的提高和乙草胺生物毒害性的降低。
Through pot experiment in black soil, the change rule of acetochlor in maize seedling and the dynamic characteristics of soil microbial biomass carbon were studied under corn planting and non-planting conditions. The results show that acetochlor has a short half-life in soil and soil microbial activity is the main factor affecting its degradation. However, the application of acetochlor had no significant effect on soil microbial biomass carbon because application of fertilizers greatly stimulated microbial activity. However, corn planting has a significant impact on soil microbial biomass and soil acetochlor residue. Soil microbial biomass carbon significantly increased under maize planting, while the amount of acetochlor residue in the soil decreased, indicating that planting maize was beneficial to the increase of microbial activity and reduction of the bioaccumulation of acetochlor.