Effect of biobed composition, moisture, and temperature on the degradation of pesticides
Effect of biobed composition, moisture, and temperature on the degradation of pesticides
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DOI：
10.1021/jf0707637
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发表时间：
2007-07-11
影响因子：
6.1
通讯作者：
Torstensson, Lennart
中科院分区：
文献类型：
--
作者：
Del Pilar Castillo, Maria;Torstensson, Lennart
生物床通过由稻草、泥炭和土壤组成的生物床混合物的存在来保留和降解农药。在实验室研究中，研究了生物床组成、含水量和温度对农药降解的影响。秸秆产生的生物床混合物中的主要微生物活性，秸秆，呼吸和酚氧化酶含量之间的强正相关性。大多数农药调查共代谢过程中消散，其消散与呼吸和/或酚氧化酶含量。在生物床含水量为60%持水量（WHC）时，比在30%和90%持水量时，更多的农药被消散，而20 ℃的消散率高于2 ℃和10 ℃。建议在田间生物床中采用50：25：25%v/v的秸秆：泥炭：土壤比例，因为这会产生高微生物活性和低pH值，有利于木质素降解真菌和酚氧化酶活性。
Biobeds retain and degrade pesticides through the presence of a biobed mixture consisting of straw, peat, and soil. The effects of biobed composition, moisture content, and temperature on pesticide degradation were investigated in laboratory studies. Straw produced the main microbial activity in the biobed mixtures as strong positive correlations were observed between straw, respiration, and phenoloxidase content. Most pesticides investigated were dissipated by cometabolic processes, and their dissipation was correlated with respiration and/ or phenoloxidase content. More pesticides were more dissipated at biobed moisture levels of 60% water holding capacity (WHC) than at 30% and 90% WHC, while 20 degrees C gave higher dissipation rates than 2 and 10 degrees C. A straw:peat:soil ratio of 50:25:25% v/v is recommended in field biobeds since this produces high microbial activity and low pH, favorable for lignin-degrading fungi and phenoloxidase activity.