摘要
以亚热带坡地毛竹林地为试验背景,结合室内控制条件下的降解试验,研究咪唑烟酸在土壤中的分布与归趋,以指导咪唑烟酸在类似地区的安全使用。结果表明,实验室条件下,咪唑烟酸在土壤中的微生物降解较缓慢,降解半衰期为77 d,可能是因为纯毛竹林地土壤中可降解咪唑烟酸的微生物较少或活性较低所致。田间条件下,咪唑烟酸残留主要分布在0～20 cm深度土层。当施用前期咪唑烟酸浓度较高时,随降水作用咪唑烟酸淋溶现象明显,径流损失也较严重;施用后期土壤中咪唑烟酸浓度较低时,其消解受降水影响较小,主要表现为微生物降解作用。咪唑烟酸在土壤中具有一定的移动性和稳定性,在降水量较大的山区使用时,应注意其对下游水源和环境生物的影响。
In combination with indoor degradation test under controlled conditions, a field experiment was carried out in a bamboo forest on a hill slope in the subtropics of China to study distribution and fate of imazapyr in the soil, so as to guide safe use of the substance in similar regions. Results show that under laboratory conditions mierobial degradation of imazapyr was quite slow in the soil, and degradation half life of the substance was 77 d, which might be attributed to the cause that imazapyr-degrading microbes in the soil of a pure bamboo forest were few in population or low in activity. In the field imaza- pyr residue was distributed mainly in the 0 - 20 em soil layer. In the early days after imazapyr application when the concen- tration of the substance was high its loss througJl leaching and runoff with rainfall was significant, while in the late days after imazapyr application when the concentration of the substance was low, its degradation was little affected by rainfall, but mainly by soil microbes. Imazapyr has certain mobility and stability in soil. In case it is used in mountainous areas high in rainfall, attention should be paid to its oossible imoact on water sources, environment and bioloev in the downstreams.
出处
《生态与农村环境学报》
CAS
CSSCI
CSCD
北大核心
2012年第3期333-336,共4页
Journal of Ecology and Rural Environment
基金
国家林业局林业公益性行业科研专项(201004008)
浙江省重点科技创新团队项目(2009R50030-05)
关键词
咪唑烟酸
残留
分布
微生物降解
淋溶
径流
imazapyr
residual
distribution
microbial degradation
leaching
runoff
