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通过长期田间定位试验,研究了水旱轮作条件下不同复种方式对稻田杂草群落组成及物种多样性的影响.结果表明:复种轮作可显著降低稻田杂草密度,抑制杂草生长.不同复种轮作方式下,紫云英-早稻-晚玉米→紫云英-早玉米间作早大豆-晚稻(CCSR)处理物种优势度最低,能降低优势种杂草地位,减轻危害.不同复种轮作方式下基本杂草群落组成均为鸭舌草+稗草+矮慈姑,杂草群落的相似性均较高,其中紫云英-早稻-晚玉米间作晚大豆→紫云英-早玉米-晚稻(CRCS)处理与CCSR处理的相似度最高.稻田复种轮作可在一定程度上提高对杂草的抑制效果,但需要注意某些次要杂草的危害.
The long-term field experiment was conducted to study the effects of different multiple cropping patterns on the weed community composition and species diversity in paddy fields under the conditions of runoff and drought. The results showed that the multiple crop rotation could significantly reduce the weed density and the weed growth. (CCSR) treatment had the lowest species dominance, which could reduce the dominant weed species and mitigate the harm.With the different combination cropping modes, the basic heterozygosity The grass communities were all composed of Monochoria punctatus + Echinochloa crusgalli + Przewalszlagatus, and the similarity of weed communities was high. Among them, the treatments of asterixis-early rice-late maize intercropped with late-season soybean → asparagus-early corn-late rice (CRCS) The similarity to CCSR was the highest.The multiple crop rotation in paddy field could improve the weed control effect to a certain extent, but the damage of some secondary weeds should be noticed.