Tiger is one of the most valueable animals to human beings today. It is somehow like a cat, but much bigger than it. It lives in the forest, and feeds on small animals.
Nowadays, the number of the wild tiger is becoming small and small. Maybe there will be no tiger any more if people continue cutting the trees, destorying the living environment or hunt the tiger just for the skin. We must stop all these mistakes. We should protect them, because the world without tiger is not a completed one.
Tiger is one of the most valueable animals to human beings today. It is somehow like a cat, but much bigger than it. It lives in the forest, and feeds on small animals.
Nowadays, the number of the wild tiger is becoming small and small. Maybe there will be no tiger any more if people continue cutting the trees, destorying the living environment or hunt the tiger just for the skin. We must stop all these mistakes. We should protect them, because the world without tiger is not a completed one.
to prevent H7N9 we should know some common sense. First of all, it is important for us to prevent H7N9 from ourselves. For example, clean our hands frequently.
Sencondly, do more exercises. Such as running. Lastly, change our diet to keep balence. For example, eat more types of vegetables and drink more water
化学农药因为其效果显著、应用直接、起效迅速以及所需投入较少,所以在农作物的害虫防治方面,一直是广大农民的首选。但是因为化学农药被大量的应用,所以使得害虫逐渐对于农药产生了抗药性,在此情况下,只有继续提升农药的使用量,才能够达到防治农作物害虫的目的,但越来越大的农药使用剂量,对于环境、生态以及人类自身的身体健康都产生了非常严重的影响。
(一)农药残留对环境产生污染。
对作物采用农药***虫的时候,农药种只有很少的一部分作用到害虫身上,起到***虫的作用,绝大部分的农药都会被固定在水源、土壤中,直接严重污染周边的环境。
(二)农药打破周边的生态平衡关系。
农药的应用的确能解决虫害问题,但是在***死相关害虫的.同时,周边有益的动物也会受到严重的影响,甚至会导致部分有益动物在一定区域内灭绝,严重的损害当地的生态平衡。
(三)农药对人类自身健康产生严重危害。
由于化学农药的使用剂量在不断的增加,所以这种对农药的过度使用会导致农作物中残留大量的农药,当浓度高于一定程度后,使用后会直接导致中毒的情况出现。而且上文中所提到的被固定在水源以及植物中的农药,会通过食物链关系逐渐在人的体内富集,逐渐引起人类的多种慢性疾病。
相对于化学农药而言,因为绿色种植管理技术充分的结合了多种治理方式,显著的降低了农产品的有毒有害物质的残留量,从而更好地提高了农作物的产量,加少了农业种植对于周边环境的污染情况,更好地促进了农业生产的现代化发展。
参考文献:
[1]李阔,许胤龙.适应气候变化的中国农业种植结构调整研究[J].中国农业科技导报.2017(01)。
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