摘要
１９９５～１９９７年对３个农区稻田杂草群落进行了调查。结果表明，沿江农区稻田以鸭舌草、丁香蓼、矮慈菇、异型莎草等为优势杂草种，丘陵农区稻田以矮慈菇、节节菜、丁香蓼等为优势种，里下河农区稻田则以鳢肠、异型莎草、丁香蓼等为主。杂草群落多样性相似，均匀度相近，说明３个农区稻田杂草群落近似。在影响群落结构的因素中，除草剂的影响最大，苄黄隆使稗草上升了５６．７２％，异型莎草下降了３１．７６％，二氯喹啉酸、禾大壮、丁草胺分别使稗草下降９０．６４％、９７．３５％和６７．８２％，而阔叶杂草相应上升；实行水旱轮作有利于杂草的控制；不同深度的水层对杂草的发生有影响；缺施三大元素之一１年不会给稻田杂草群落结构产生明显影响。
Weed communities in paddy fields were investigated in the Yangtze River side, in the Hills and in the Lixiahe agricultural region. Simpson′s indices of the three communities were 0.7193, 0.7003, 0.6514 and Shannon′s indices were 0.6513, 0.6162, 0.5945 respectively. Application of herbicide marked influenced weed community structure in paddy field. Density of Echinochloa crusgalli increased after bensulfuron methyl treatment and of broadleaf weeds was inverse. Desity of E. crusgalli was extremely reduced and of broadleaf weed was increased after 30 days with quinclorac, molinate, butachlor. Relationship between water depth ( X ) and weed density ( Y ) is expressed with Y =259.9096·e -0.9005 X -1. The experiment showed that there was no influence of application of N, P, K on weed community.
出处
《江苏农学院学报》
CSCD
1998年第4期47-51,共5页
Jiangsu Agricultural Research
基金
江苏省"九五"农业科技重大攻关项目
关键词
稻田杂草
除草剂
水层
施肥
群落
weed in rice field
herbicide
water depth
fertilization
community
