Dissertation > Agricultural Sciences > Plant Protection > Harmful plants and their removal > Weeds > Theories and methods of weed control

Competition Effects and Their Mechanisms between a Replacing Ryegrass, Lolium Perenne, and An Alien Invasive Eupatorium Adenophorum

Author ZhuHongWei
Tutor MengLing
School Nanjing Agricultural College
Course Agricultural Entomology and Pest Control
Keywords E. adenophorum Ryegrass Alternative control Ground competition Underground competition
CLC S451.1
Type Master's thesis
Year 2005
Downloads 244
Quotes 4
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The E. adenophorum (Eupatorium adenophorum), also known as the destruction of grass, daisy Keze Lan is a perennial weed invasion. For control E. adenophorum harm, since the twenties, to carry out a of E. adenophorum prevention technology research. Plant species-competitive effects of control E. adenophorum harm alternative control (Replacement Control) as a control both the harm and cost-effective method has been widely used. Optional alternative plants, perennial ryegrass (Lolium perenne) because of its rapid growth and high economic value and become one of the control E. adenophorum alternative plants. At present, on the application of ryegrass E. adenophorum control mechanism are still very scarce. Ryegrass relative to the E. adenophorum run is a with an alternative to the more competitive species the ryegrass and E. adenophorum, the spatial distribution of (planting density and proportion) whether to have an impact on the outcome of competition between the two, competitive parts (above-ground competition and underground competition) the relative importance of the impact the ryegrass and E. adenophorum of competition results, as well as above and below ground competition whether an interaction affect the growth of the two plants. In this paper, to carry out research the ryegrass and E. adenophorum of interspecific competition mechanism and influencing factors, the main findings are as follows: First, replaced by the composite de Wit experimental design method the ryegrass and E. adenophorum, relative competitive force in the field with potted plants take ryegrass (Lolium perenne) and crofton weed (Eupatorium adenophorum) the relative competitiveness of ryegrass and E. adenophorum of aboveground biomass relative competitiveness indicators: the relative yield (Relative yield), the sum of the relative yield (Relative yield total) and competitive attack (Aggressivity). The results show that relative competitiveness indicators, ryegrass relative to the E. adenophorum is a strong contender and require the same resources, the competition will be one of the exclusion of the symbiotic population: the E. adenophorum RY value addition to the two pots -1 , the rest of the density ratio of combination treatment significantly less than 1.0, ryegrass density, low proportion conditions (50%, 25% ) RY values ??were significantly greater than 1.0, indicating that withstood by Eupatorium interspecific competition is greater than intraspecific competition, and ryegrass experience the intraspecific competition is greater than interspecific competition; and E. adenophorum, competitive attack ( aggressivity) -2.09 ± 0.29, the competition attack (2.09 ± 0.29) less than ryegrass, E. adenophorum the seedling relative ryegrass is a weak competitor; ryegrass and crofton weed hybrid relative yield total (RYT) in all density proportional combination with 1.0 difference is not significant, indicating that the the ryegrass and crofton weed growth demand the same resources. According to

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