摘要
研究了小麦秸秆、草木灰、黑碳和含灰土对农药敌草隆的吸附行为以及敌草隆在含灰土和无灰土中的微生物降解速率．研究表明：敌草隆在无灰土和小麦秸秆上的吸附是分配过程，logKoc分别为2．33和2．07；草木灰还田与秸秆还田相比，敌草隆的田间吸附量将提高9．7倍；从草木灰分离的黑碳对敌草隆的吸附能力要比草木灰高7～45倍，敌草隆在含灰土上的吸附量是无灰土的3倍多，陈化1年不能降低含灰土的吸附能力；敌草隆在无灰土和含灰土中的微生物降解符合一级动力学过程，土壤中加入0．5％的草木灰后，敌草隆的降解速率常数下降了45％，半衰期时间延长了66％．
Sorption of diuron by wheat straw, its ash arising from burning, ash-based black carbon and ash-amended soil was studied. The sorption of diuron on ash-free soil and wheat straw occurred via partitioning behavior with log Koc values of 2.33 and 2.07, respectively. The ash adsorbed 9.7 times more diuron than wheat straw when leaving them unburned in the field. Black carbon was 7-45 times more effective than ash and ash-amended soil was 3 times more effective than ash-free soil in sorbing diuron over the range of the experimental concentrations. Aging of the ash for 1 year in the soil did not influence ash sorptivity. The biodegradation of diuron in the soil in the presence and absence of the ash was fitted to first-order kinetics. The rate constant reduced by 45% and the half life increased by 66% when 0.5% ash was amended to the soil.
出处
《华东师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2006年第6期125-130,共6页
Journal of East China Normal University(Natural Science)
基金
污染控制与资源化研究国家重点实验室(同济大学)开放课题(PCRRF05003)
华东师范大学主干课题建设(521J0387)
关键词
草木灰
敌草隆
土壤
吸附
微生物降解
wheat-straw-derived ash
diuron
soil
sorption
biodegradation
