Effects Of Crop Farming Systerm On Weed Communities In Farmland Of Zhoukou Region

Weed is refers to the growth in farmland, orchard, vegetable garden (or medicinal garden) in nonartificial deliberately cultivated plants, including grasses, shrubs and parasitic weeds. Weeds have a strongadaptability and reproductive ability, is an important component of agricultural ecological system, andcompete for space, water, nutrients and sunlight with crops, directly affects the yield and quality of crops.According to statistics, about9.5%crops failure roots in weeds all over the world because of the harm ofweeds, close to the disease and insect pests, the losses caused by. To solve the problem of weeds has a veryimportant significance to improve the yield and quality of crops. Research has shown that, rational rotationmode can reduce some weeds dominance in farmland. In this paper, through the investigation on growth indifferent rotation field weed, using inverted "W" nine point sampling method, determination of weedspecies, quantity, distribution, calculation of weed of relative abundance, importance value and dominance,weed species diversity and similarity index in different farmland, draws the following conclusion:See through the relative abundance and importance value of weeds: Kochia scoparia, Polypogonmonspeliensis, Polypogon monspeliensis Descuminia sophia are the preponderant weeds in wheat field ofsoybean-wheat rotation; Digitaria sanguinalis, Gramineae, Setaira viridis, Cyperus iria L. are thepreponderant weeds in soybean field of soybean-wheat rotation. Echinochloa crusgali, Chenopodiumalbum, Descuminia sophia are the preponderant weeds in wheat field of maize-wheat rotation;Sorghumsudanense(Piper)Stapf., Cyperus rotundus L., Digitaria sanguinalis (L.)Scop, Gramineae arethe preponderant weeds in maize field of maize-wheat rotation. Echinochloa crusgali, Descuminia sophiaare the preponderant weeds in wheat field of peanut-wheat rotation; Setaira viridis(L.)Beauv, Digitariasanguinalis, Gramineae, Cynodondactylon(Linn.)Pers.are the preponderant weeds in peanut field ofpeanut-wheat rotation. Descuminia sophia,Kochia scoparia, Alopecurus aequalis Sobol.,Echinochloacrusgalli (L.) Beauv are the preponderant weeds in wheat field of-wheat rotation; Gramineae,Setairaviridis(L.)Beauv, Digitaria sanguinalis, Sorghumsudanense(Piper)Stapf. are the preponderant weeds incotton field of cotton-wheat rotation. Through comparative analysis can be drawn, relative abundance andimportance value has a relative consistency in the reaction of weed dominance.See through the weed types and number, cotton-wheat intercropping system is most; followed by peanut-wheat rotation system, soybean-wheat rotation system, maize-wheat rotation system. See throughthe weed species similarity, weed species had the highest similarity in the peanut-wheat rotation andsoybean-wheat rotation system, followed by maize-wheat rotation system and soybean-wheat rotationsystem, and then the maize-wheat rotation system and peanut-wheat rotation system, cotton-wheatintercropping field and soybean-wheat rotation system, weed species had the lowest similarity in thecotton-wheat intercropping field and peanut-wheat rotation system. See through the species diversity index,the order of weed species diversity index in different tillage system is cotton-wheat intercropping field>peanut-wheat rotation field> soybean-wheat rotation field> maize-wheat rotation system.To sum up,through the different tillage system of weed species relative abundance, comprehensiveanalysis, the important value of species diversity and dominance, can be seen that the harm of weeds isgreater in the cotton-wheat intercropping field and peanut-wheat rotation field, and maize-wheat rotationand soybean-wheat rotation system is smaller, show certain control ability in the type and quantity ofweeds.