1) weed population
杂草种群
1.
Important values of 20 weed populations belong to 19 genera,8 families in wheat fields of Nanjing City and Chuzhou City were investigated,and the principal component analysis (PCA) of main weed populations were conducted.
对江苏省南京市和安徽省滁州市麦田杂草群落进行了调查,测定了隶属8科19属的20种杂草的重要值,并用主成分分析的方法,研究了主要杂草种群在群落中的地位。
2) hybrid population
杂种种群
3) weed community
杂草群落
1.
Effect of protective cultivation on weed community composition and species diversity
保护性耕作对农田杂草群落组成及物种多样性的影响
2.
Four weed community groups were divided in 31 sites, one of which was obtained with almost all soybean (com) stubble rape field sites dominated with Galium apalium, and three gro.
利用７ 级目测法调查了南京地区油菜田３１ 个样点的杂草优势度级，并以其重要值为指标，对３１ 个样点的杂草群落进行计算机模拟聚类分析。
3.
Digitaria sanguinalis+Acalypha australis+Cephalanoplos segetum+Setaria viridis weed community distributed in the cotton fields with the successive .
采用杂草群落和草害的数量研究方法，对江苏省沿海地区棉田杂草草害和群落的发生及分布规律进行了定量调查研究。
4) weed population
杂草群落
1.
Effects of wheat rotation and monocropping system on weed populations in wheat fields;
小麦连作、迎茬和轮作对麦田杂草群落的影响
2.
Effects of corn rotation and continuous cropping system on weed population;
玉米连作、迎茬和轮作对田间杂草群落的影响
5) weed seeds
杂草种子
1.
Species and dynamics of floating weed seeds in paddy field;
稻田水面漂浮的杂草种子种类及动态
2.
The species and number of weed seeds that dispersed by irrigation water were recorded and counted,the weed communities on the ridge of the paddy field and in surrounding habitats of the ditch were surveyed,and they were compa.
选择典型稻作区,对灌溉水流传播的杂草种子的种类和数量进行取样调查,并与田埂、灌溉水渠周围生境、下茬麦田的杂草群落及稻田土壤杂草种子库进行比较分析,以研究自然条件下灌溉水流传播的杂草种子与土壤杂草种子库及其他生境杂草群落间的相互关系。
3.
Under the condition of constant temperature at 25±1℃ and 12 hour light/d,the effects of paclobutrazol on germination of 5 dicotyledonous weed seeds in orchard,which are Pharbitis purpurea(L.
等5种双子叶果园有害杂草种子萌发的影响。
6) species of weeds
杂草种类
1.
The results showed that there are 38 species of weeds belonged to 18 families.
2002年7月-2003年6月对西宁地区草坪主要杂草种类和危害情况进行了调查。
补充资料：种群增长率(见种群出生率)
种群增长率(见种群出生率)
种群增长率见种群出生率。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条