关键词: 遗传分析, 遗传分析

Abstract: In this study, the author selected salinization abandoned farmland in different years, through sampling methods surveyed and analyzed these abandoned farmland chamaephytes composition, structure, quantity, etc. community characteristics and vegetation succession regular pattern. The results showed that: the first invasion of salinization abandoned farmland was a large perennial herb and annual herb, then gradually over the shrub community types, until the formation of relatively stable shrub, and half-shrub communities. Abandoned farmland in the early was salt tolerance herb as dominant, with abandoned farmland time, herb fading away but the shrub community development, and to form a monodominant community like Lycium ruthenicum Murr or Kalidium cuspidatum, in some sections the formation of Lycium ruthenicum Murr, and Kalidium cuspidatum for the excellent kind of community types. Species was richness, and Simpson index was higher on early abandoned farmland; with abandoned farmland time prolonged, species richness and Simpson index were lower, finally reached a relatively stable state; ecological dominance of dominant populations was the more improvement and the abandoned farmland becomes longer. Salinization of farmland reflected the standing vegetation types succession to a single trend. By the Lycium ruthenicum or Kalidium cuspidatum as the dominant species formed shrub communities were 2 formed a relatively stable community types on Minqin salinization abandoned farmlands, the dominant species (Lycium ruthenicum and Kalidium cuspidatum) density was of 23100/hm2 and 31500/hm2, respectively.