文档介绍：环境生态学论文
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. P对人类危害的潜在危险。大量不合理的农药的使用，不仅杀死了大量的害虫天敌和其它非目标昆虫，同时也使害虫产生了抗药性，农业不得不用更大剂量的农药来消灭害虫。农药具有效果迅速、可防治、适用面广、价格低廉的优点而受到农业的大量使用，但是在一定程度上也破坏了农村生态环境的稳定性，农业生态系统的稳定性变得更加危险。而化肥造成都匀市农村多处湖泊的富营养化，影响了农村鱼塘经济鱼类的生产，水质恶化，使鱼塘鱼苗的存活率低，水质含氧量减少也影响了经济鱼类的生产。
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在我印象中，小时候河水十分清澈可以再里面游泳。但是随着人们生活水平的提高，垃圾的成分越来越复杂，毒害越来越严重，排放量越来越大，却在都匀市农村几乎没有垃圾处理的任何措施以及设备，垃圾都是倒到河里。在枯水期，河里没有水，只有垃圾。在城市中虽然工业污染及生活污染也较重，但是会有相应的处理措施，而在都匀市的农村中几乎无任何处理措施，生活垃圾随便倾倒，污染更为严重。其危害表现在：
占用土地，破坏自然生态
目前都匀市农村垃圾主要采取了填埋、自然堆放等处理方法。天长日久侵占了越来越
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valuesw