The Study Of Community Stability And The Establishment Of Yield Factors Model About Mix-Sowing Of Medicago Sativa & Bromus Innermis

Mixed sowing is a good way for communities planting. Mixed pasture has a lot of advantages in respect of quality, yield and communities stability, so that it is an essential part of intensivism stockbreeding. In this paper, we studied community stability, forage quality and yield character about the mixed-sowing of Medicago sativa and Bromus intermis from 2003 to 2004 and using Factor Analysis, Principal Components Analysis methods and getting the yield forecast model with linear regress multianalysis method. The study provided theoretical foundation for establishing high yield and good quality artifical pasture. The results show:Mixed treatment can obviously improve soil fertility; he way of mixed-sowing has no influence in plant height and its growth conforms to quadratic equation Y=ax2+bx+c;Medicago sativa influences the total forage yield in every mixed treatment;All the communities are stable and there is no disturbing or little disturbing between the two population in different treatments;By using Factor Analysis and Principal Components Analysis methods, we decide several factors that influence forage yield, such as branch number, sub-branch weight, leaf number, sub-branch length and single leaf weight. And then getting the yield forecast model with linear regress multianalysis method. From the medol we can learn that descendiblity is the main factor that influences forage yield for every treatment;The proportion of output and input of every treatment has the same result with the economic profit, that is: B>a>A> C>b>c>CK1>CK2.