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九十年代末期,长江流域连续发生两次洪涝灾害,造成严重的损失。有关部门认为,生长在河湖水域中的芦苇阻滞泄洪,于是大规模大面积地实施化学灭苇工作,即以喷洒灭生性的化学除草剂,把正在生长中的芦苇杀死。这样做的好处是,动用的人力少,进度快。但也有很多弊端,其害往往甚于益。第一,实施化学灭苇后,芦苇不是立即就死,一般在一个星期,甚至半个月以上。我省雨季一般出现在7月。实施化学灭苇,据我所知,通常在6月,此时芦苇已高达1.5-2米。芦苇被杀死后,依然原地站在水中,待其腐烂,一般需两个月左右,对水流的阻滞作用没有十分明显的减弱。相反,稍经时日,其整体坍塌后由于茎叶都在水中,对水流的阻滞还会加大。
In the late 1990s, two consecutive floods hit the Yangtze River, causing serious losses. Relevant departments believe that reeds growing in rivers and lakes impede flood discharge, so large-scale chemical remediation work on a large scale, that is, by the killing of chemical herbicide spraying, the growing reeds to kill. The benefit of doing so is that less manpower is used and progress is faster. But there are also many drawbacks, which are often more harmful than benefits. First, after the chemical reed, the reed is not killed immediately, usually in a week, or even more than half a month. Rainy season in our province generally appear in July. The implementation of chemical reed, as far as I know, usually in June, when reed has been as high as 1.5-2 meters. Reed was killed, still standing in the water in the original, to be decay, usually takes about two months, the water flow blocking effect is not significantly reduced. On the contrary, after a long period of time, due to the stems and leaves in the water after the collapse of the overall block on the water will increase.