摘要
研究意义浙江金华地处浙江中部，旱地面积有５．０９×１０４ｈａ，占耕地总面积的１８％以上，棉花、大豆、甘薯等秋旱作物是该地区重要的经济作物，几年来，由于农村劳动力转移，中耕除草减少，草害问题日趋严重。化学除草是解决旱田草害的有效方法。但是，除草剂的长期...
In the autumn_harvested dry
crop fields of Middle Zhejiang province,170 random sampling fields of 17 sites on different
ecological conditions were surveyed in detail with seven scales by visualization of weed
dominance and the weeds important value to autumn_harvested crops was obtained. The
principal components analysis (PCA) and the method of minimal spanning tree (MST) were used
to reveal the ecological similarity of 22 main weeds in autumn_harvested dry crop fields.The
results showed that the ecological similarity among Digitaria sanguinalis,Setaria
viridis,Eleusine indica,Cyperus iria,Cleome viscosa and Echinochloa crusgalli var.
hispidula,Cynodon dactylon,Acalypha australis,Cyperus rotundus was high, while Mazus
japonicus,Centipeda minima,Luwdigia prostrata,Lindernia antipoda,Mollugo pentaphylla and
Eclipta prostrata had the similar ecological demands.The fast shift of weed populations under
succesive application of a certain herbicide in a long peroid of time resulted from two
factors:the different sensitivity of various weeds to the herbicides applied and the different
ecological demands of the weeds in crop fields. Therefore, it is important to study the ecological
demand difference among various weeds.
出处
《生态学杂志》
CAS
CSCD
北大核心
1999年第2期5-9,共5页
Chinese Journal of Ecology
关键词
秋旱作物
杂草
生态学
主成分分析法
最小生成树
autumn_harvested dry crop
weeds
the principal components analysis (PCA)
minimal spanning tree (MST).
