摘要
研究进行了田间杂草调查方法，以估计2014年埃塞俄比亚比拉特烟草农场中存在的最常见，密度最大的杂草物种，总计覆盖约145公顷。在研究期间，从研究地点报告的7个杂草科中，总共记录了属于06个单子叶植物和08个双子叶植物科的14种杂草物种。单子叶植物禾本科（Poaceae）具有4种杂草种类，其次是双子叶植物复合材料（3种杂草）。莎草科，茄科和A科各有2种杂草，罂粟科由1种杂草代表。基于频率的百分比香附子（莎草）的莎草科为99.30。数据显示，犬齿龙和马尾松均属于禾本科，而莎草（Cyperus esculentus）莎草科是最丰富的杂草，其密度分别为35.9、14和12（/m2）。相对丰度值量化了具有较高相对丰度的食心莎草（Cyperus esculentus）造成的总体杂草问题，为98.97。重要性指数表明，莎草科和禾本科家族可以被认为具有减少烟草产量的巨大潜力。而观察到黑茄和曼陀罗的种群密度最低的是0.00和1.03（/m2），最不常见的是2.7和13.51％，相对杂草的含量最少，分别为0.07和1.03，重要指数2.8和14.8。
关键词： 频率，烟草，杂草调查
Abstract
An in-field weed survey method was conducted to estimate the most frequently, density and abundance weed species present in Bilatte tobacco farm, Ethiopia during 2014 totally covered approximately 145 hectares. During study period a total number of 14 weed species belonging to 06 monocot and 08 dicot families were recorded out of 7 families of weed reported form study site. The most predominate was shown by monocot Poaceae having 4 weed species followed by dicot family Composite having 3 weeds. The families Cyperaceous, Solanaceae and Amaranthaceous each having 2 weeds, and the family Papaverceae represented by 1 weed. Based on % of frequency Cyperus esculentus (sedges) family Cyperaceous was 99.30. The data showed that Cynodon dactylon and Digitaria abyssinica belong to family Poaceae and Cyperus esculentus family Cyperaceous were the most abundant weed with a density of 35.9, 14 and 12 of plant m-2 respectively. Relative abundance values quantify the overall weed problem posed by specie Cyperus esculentus that had higher relative abundance was 98.97. The importance value index indicated that Cyperaceous and Poaceae families can be considered the great potential to cause reduce tobacco production. Whereas, Solanium nigrum and Datura stramonium were observed with least population density 0.00 and 1.03 plant m-2, least frequently 2.7 and 13.51 %, least relative weed abundance, 0.07 and 1.03 with importance value index 2.8 and 14.8 occurring weed respectively.
Key words： Frequency, Tobacco, Weeds Survey
参考文献 References
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]