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摘要
Tebuthiuron（N - [5 - （1,1 -二甲基乙基）-1,3,4 - 噻二唑- 2 – 基] - N，N'-二甲酰脲）出现用以控制河岸灌木saltcedar（柽柳），但是，它的使用受到限制，因为这种除草剂对水生系统的危害除草剂尚不明确。通过对对十2846-1三相开放系统的生物群落的审查，确定了tebuthiuron对水产品生产的可能影响。每个围隔中都沉积物，水，藻类，微生物和无脊椎动物和鱼类，而且是开放式的气氛中进行的气体交换,有大型无脊椎动物和藻类存活。下面是tebuthiuron剂量的使用,分别采用：0（对照组），10，70，200，500和1000µg/L。在对水体进行tebuthiuron浓度的检测后,得到以200µg/L '为近似的最高剂量的分水岭。Tebuthiuron不良影响分析中用分析纯数据,对围隔之间的变量进行相关性分析。控制浓度在200µg/L，平行做三次，以得到在此浓度下对水产品生产力影响的确切数据。沉积物对tebuthiuron的吸附用 Freundlich方程x /m= 3.24c ° 0 68来描述。在tebuthiuron存在下浮游植物初级生产力，摇蚊密度和生物量分别于摇蚊的浓度呈现负相关。相反，杂食性鱼类和除草剂浓度没有影响没有。200µg/L浓度时，只有摇蚊密度减少。在摇蚊密度减少的因素可能包括：1）在200µg/L下，产生变异，与藻类组合产生很大比例的‘难吃'生物量，2）剂量大于200µg/L '时，藻类的生产力降低，藻类在生物群落转移。200µgΙ-1下摇蚊的密度在减少表明， 200µg/L 'tebuthiuron浓度时会对水体产生有害影响。论文网