紫茎泽兰在罗甸县的分布及危害调查

Investigation on the Distribution and Damage of Eupatorium adenophorum Spreng in Luodian County

罗甸县紫茎泽兰分布及危害调查是结合罗甸县森林资源二类调查工作开展,以小细班区划和系统样地调查为基础,在有紫茎泽兰分布地段作虚线区划,求算分布面积。危害度调查与系统点调查相结合,开展地类、林种、株数、盖度、高度调查,并划定危害等级。调查结果表明:全县紫茎泽兰危害面积49627hm2,其中:轻度危害26327hm2,占危害面积的53.05%;中度危害13107hm2,占26.41%;重度危害10193hm2,占20.54%。入侵地类主要有油桐林、石质山地、荒山荒地、低效疏林地、低效灌木林地、弃耕地、未成林造林地、四旁地以及溪边、水塘边、水沟边、路边,以油桐林、石质山地、荒山荒地、公路两侧及小溪边为主。当林分郁闭度达0.6以上,或灌木盖度达70%以上,或杂草盖度达80%以上,紫茎泽兰分布极少或没有紫茎泽兰分布。

The damage and distribution of Eupatorium adenophorum Spreng were investigated in Luodian county keeping pace with the forest management inventory. The result showed that Eupatorium adenophorum Spreng in this county has invaded and occupied an area of 49 627 hectares,including 26 327 haectares of light damage （53.05% of the total）,13 107 hectares of medium damage （26.41% of the total）,and 10 193 hectares of severe damage （20.54% of the total）. Land types which had been invaded by the weed are ： tung tree forests,rocky mountains, waste hills and lands, low-quality open forest lands, low-quality shrub lands, abandoned farm lands, immature plantations, four-side spaces, and the sides of streams,ponds,ditches, and roads,etc. In locations where the forest canopy density 〉 0.6, or the shrub coverage 〉 70%, or the herb coverage 〉 80% ,little or no Eupatorium adenophorum Spreng grows.