Study On Screening Of Interspecific Components And Stablity Of Legume-grass Mixture At Zhaosu Horse Ranch

This experiment takes building in4years the legume-grass mixture as the research object in Zhaosu Horse Farm, Ili Prefecture. Trifolium pratense, Medicago stativa, Onobrychis viciaefolia, Dactylis glomerata, Bromus inermis, Phleum pretense were studied in the seven legume-grass combinations:mixed6species, mixed5species-1, mixed5species-2, mixed4species-1, mixed4species-2, mixed3species-1, mixed3species-2at three rowing ratios:5:5,4:6,3:7. The yield,forage yield and comperhensive performance were analyzed.The results showed:1. Because of mixing with leguminous grass which have take fully advantages of biological nitrogen fixation, so to promote greatly the growth of grasses, larger improve the mixed sowing grassland productivity.From the view of the average yield of first cutting in establishing1-4years, mixed4species-2was the highest,which reached655.91g.m-2; Secondely for mixed3species-2and mixed6.From the yield of second cutting to see, the yield of mixed5species-1was the highest, which reached343.91g.m-2; following is that mixed6, mixed5species-2,meanwhile, exhibits a law of:fourth year>third year>second year.To see the annual output mixed4species-2were the best always, reached827.29g.m-2; following is the mixed3species-2and mixed6.Generally, the yield of build in1-2years fluctuation was the larger and the yield of build in3-4years tend to stable state. Therefore, from the view of average yield of four years,we can screening for the best yield of treatment of mixed4species-2.2. The yield of CP in the perennial turf at different age were increased year by year;The yield of EE were at peak in the second year and there were significant differences other treatment(P<0.05);The trendency of the yield of ADF,NDF and the steam-leaf ratio were decreased year by year. Also showed that the yield of complex treatment higher than the simpletreatments and the steam-leaf ratio have the exhibits a law:the containing of Sainfoin higher than the no containing treatments.From the above the evaluation of quality and by screening the mixed4species-2to the best forage quality treatment.3.From the evaluation of comperhensive performance to see, mixed4species-2for the double of yield and forage yield were the best treatment.Above all the results showed that the leguminous grass of alfalfa and the grasses of cooks foot were the best mixed species and pioneer both in yield and quality.Also,better adaptability behavior of in this area.4. With the increasing of the construction number of years, the yield and variability of changes the different mixed treatments and species showed that the treatment of higher yield can not always coexisted stably in this treatment. Also showed that the forage components only have the species compatibility and the interaspecific compatibility of the different treatment and species, this can keep the stability.5.Along with the construction years by gone the mixed treatment legume,grass proportion was changed. the inceasing of speed the grass replace for the legume and discreasing of the similarity of community,and the performace of yield was different from the different treatment and the stability of different treatment inconsistently from others.The different legume-grass treatment was reach for the condition of stability of its proportion of legume at20-25%.The under ground biomass of complex treatment was advantages from simple treatment and reflect that the intermediate competition complex treatment more than the simple treatment.6.This mixed pasture the instability of in earlier stage to development of the yield and ecological stability of at present.Especially for tretment mixed4species-2were the best one,the species for:alfalfa,redclover,cooks foot,bromus inermis.Therefore, suggestion about build in the high yield and quality of mixed pasture in Zhaosu Horse Farm, Ili Prefecture.