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上个世纪40年代,一种有毒、侵占性很强的名叫紫茎泽兰的恶性杂草从泰国、缅甸进入我国云南西部,至70年代,此草只在云南的西南部比较常见,但在此后短短的20年间,紫茎泽兰以每年30公里的速度向北蔓延,如今,除云南百分之八九十的幅员面积上都能见到它的踪迹外,此草已蔓延到了四川的凉山彝族自治州。紫茎泽兰所到之处,其它植物无法生存,牧民无法放牧,给当地的畜牧业造成了极大的损失。为此,凉山彝族自治州州政府在5年前下发红头文件,发起了一场铲除毒草的“人民战争”。但5年过去了,该州漫
In the 1940s, a kind of toxic and aggressive nature weed, called Eupatorium adenophorum, entered the western Yunnan province of China from Thailand and Myanmar. In the 1970s, this grass species was only found in the southwest of Yunnan Province. However, In a short span of 20 years, Eupatorium adenophorum spread northward at a speed of 30 kilometers a year. Nowadays, except for the coverage of 89% of Yunnan’s area, the grass has spread to Liangshan Yi Autonomous Prefecture in Sichuan Province. Where Eupatorium adenophorum goes, other plants can not survive and pastoralists can not graze, causing great losses to local livestock husbandry. To this end, the state government of Liangshan Yi Autonomous Prefecture issued a red tape five years ago to launch a “people’s war” to eradicate poisonous weeds. But 5 years later, the state diffuse