| 1. | Coefficient of gene differentiation ( gsr ) was 0 . 1567 , that was 15 . 7 % of genetic variation among subpopulations , and 84 . 3 % within subpopulation
基因分化系数g _ st值和shannon多样性指数分析结果均表明遗传变异的大部分存在于亚居群内(约为84 |
| 2. | By shannon phenotypic diversity index from rapd data , it was found that 69 . 33 % of molecular variation existed within subpopulations while 30 . 67 % of which among subpopulations
又利用neis指数估计叉毛蓬居群的遗传多样性，也表明大部分的分子变异存在于亚居群之内( 69 . 48 ) 。 |
| 3. | The result with nei ' s index also identified it . and the genetic differentiation coefficient was 0 . 3052 , which showed the genetic differentiation had occurred among subpopulations of p . sibirica in the oasis - desert zone
但叉毛蓬亚居群的遗传分化系数( g _ ( st ) )为0 . 3052 ，说明亚居群间已有明显的遗传分化发生。 |
| 4. | The individuals within subp . 4 were clustered firstly into one group as well as subp . 5 in fact , because of the similarity of the environment , subp . 4 and subp . 5 had the same genetic characteristics . and then subp . 1 , subp . 2 was clustered
这可能是由于亚居群4 、 5所处环境的相对一致性；亚居群1 、 2也是由于所处环境的相对一致性，之后聚为一支。 |
| 5. | The higher ppb ( 77 . 99 % ) was in subp . 2 and lower ( 61 . 04 % ) in subp . 5 . the ppb ' s order was subp . 2 > subp . l > subp . 4 > subp . 3 > subp . 5 . the result revealed higher genetic diversity level in p . sibirica
利用shannon多样性指数估计5个亚居群的遗传多样性，叉毛蓬亚居群内和亚居群间的遗传多样性所占的比例分别为69 . 33和30 . 67 ，遗传变异大部分存在于亚居群之内。 |
| 6. | It showed the geographical difference was not one of the potential factors , which affected the genetic differentiation of p . sibirica . the cluster analysis could classify 98 individuals into 5 centers by ward ' s method . it also showed there were some differentiations among subpopulations
根据rapd数据对叉毛蓬98个个体进行ward聚类分析，结果可将98个个体都能区分开， 5个亚居群都有明显以彼此为中心聚集的趋势，说明各亚居群间已有不同程度的遗传分化。 |
| 7. | The genetic average distance among five subpopulations of p . sibirica was 0 . 1664 ; the largest was 0 . 2445 between subp . 2 and subp . 4 , and the smallest was 0 . 1258 between subp . l and subp . 2 . it also showed the genetic variation existed among the subpopulations . moreover , the gene flow of p . sibirica population ( nm = 1 . 138 ) was lower than that of cosmopolite species ( nm = 1 . 881 ) , and much lower than that of caragana spp
5个亚居群间的遗传距离的矩阵显示亚居群2与亚居群4的遗传距离最大，亚居群1与亚居群2的遗传距离最小，分别为0 . 2445和0 . 1258 ，亚居群间的平均遗传距离为0 . 1664 ，也说明5个亚居群之间产生了遗传分化。 |
| 8. | At the first principle axis ( x - axis ) , 98 individuals concentrated on four region : subp . 1 was mainly distributed at - 2 - 1 range , subp . 2 at - 1 - 0 , subp . 3 and subp . 4 at 0 - 1 , subp . 5 at 1 - 3 . it revealed the distribution of the individuals related to the soil water and nutrition . and similarly , p . sibirica individuals scatter at the second principle axis ( y - axis ) , which representing the altitude and latitude
X轴为第一主分量， 98个个体的投射点分别集中在四个区间在一2 ~一1区间以亚居群1为主，一1 ~ 0区间以亚居群2为主， o一1区间以亚居群3 、 4为主， 1 ~ 3区间以亚居群5为主。 |
| 9. | The two species with bigger niche overlapped greatly with other species , suggesting wider niche species also had bigger niche overlaps . genetic analysis of 6 subpopulations with 117 of haloxylon ammodendron in ecotone by rapd indicated 16 primers detected 74 loci , of which 71 loci was polymorphic , percentage of polymorphic loci accounted for 96 %
采用rapd对荒漠过渡带6个梭梭亚居群117个个体进行遗传多样性分析，结果表明， 16条引物共检测到74个位点，多态位点为71个，多态位点比率为96 。 |
| 10. | Populations over maowusu sandy grassland ( nm = 5 . 9529 ) . it suggested that relatively limited gene flow might be one of important factors influencing on the genetic structure of the species . in addition , through the correlation analysis , we observed the correlation between the genetic distance of p . sibirica and latitude , longitude and altitude was not significant
叉毛蓬亚居群的基因流n _ m = 1 . 138 ，低于一般广布种的基因流水平( n _ m = 1 . 881 ) ，且远低于毛乌素沙地柠条的基因流( n _ m = 5 . 9529 ) ，相对有限的基因流可能在叉毛蓬居群遗传分化的维持中起着作用。 |
