Study On Area Variability And Genetic Diversity In Populations Of Quercus Variabilis From Shaanxi Region

Quercus variabilis population of semiaridity core of north slope of Qinling ,humidity core of Bashan and Huanglong coteau was taken as the object of our studyin Shaanxi region, through field investigation , field determination andexperiments in the laboratory, the principles and methods were applied to studysystematically the regularity of diameter structure,increment,architecturevariability ,character differentiation and geographic variability as well asgenetic diversity of Quercus variabilis population along with habitat grads fromhabitat factors,exterior variance and molecular dynamic in Shaanxi region, suchas population ecology and molecular ecology, and also explore the adaptivevariability and evolution of Quercus variabilis population, the results are asfollows: Diameter structure takes on a certain area variability along with habitatgrads. As a whole, seedling number is lacking in four regions, population renewalmainly relys on stump-sprouting sampling, and the number of stump-sproutingsampling can help population get over "bottleneck",and ensure adequatelycontinual resources. Population age and density are the dominant factors in influencing onpopulation accumulation volume. Meanwhile, The optimal combination ofpopulation structure parameters and habitat factors can arrive at the most foraccumulation volume Crown volume,LAI,total ramification ratio,gradual ramification ratio,branch dimension influence on tree high is the most in NSQ; Influence of crowncharacters on BD and bark thickness is the most in HLC. Ramification angle and leaf obliquity take on increscent trend along withhabitat grads, Gradual ramification ratio R1:2,R2:3 and total ramification ratioRb,secondary parameters of crown volume are different in different habitats. In general, nervation ,footstalk length,leaf length,leaf breadth,seedthickness,seed length,seed diameter and rear hair are different along withhabitats. Variance models of footstalk length,leaf length,bark thickness isparabola equation along with altitudes, variance models of leaf breadth,seedbreadth are obviously linear equation, variance model of seed length is typicallynegative correlation.4 陕西地区栓皮栎种群区域变异性与遗传多样性的研究 Allele frequency of MDH‐1a,MDH‐1b,MDH‐2b,MDH‐2c,PGI‐1 b,PGI‐2 b, ADH‐1a ,ADH‐1b,ADH‐2b show minish trend, allele frequency of PGI‐1a,PGI‐2a,ADH‐2a take on increscent trend from distribution center to margin,indicate: habitat bring about allele frequent change, it influences on geneticstructure of Quercus variabilis population in distribution regions, postingadaptive significance of enzyme allele as well as correlation of allele frequencyand environments. Percentage of loci polymorphism P,observed heterozygosity H0,expectedheterozygosity He value of Quercus variabilis population is higher than that oflong distance mutual wind medium angiosperm. Average genetic diversity is different in different region, distributionpattern of genetic diversity is asymmetrical within population. Correlation of grade,average temperature,light time as well as pH valueand genetic diversity is not significant(P>0.05) by correlation analysis, andthat correlation of genetic diversity and soil thickness as well as rainfallis significant( P*<0.05), correlation of genetic diversity and nitrogen,organicmatter is remarkably negative correlation(P*<0.05), the more soil thickness, themore rainfall, the more genetic diversity, the result reveals that nitrogen,organic matters,soil thickness and rainfall play an important role in regulatinggenetic diversity of population of Quercus variabilis. Most alleles in population of Quercus variabilis markedly inexistenceautocorrelation, distribution of allele and genotype correlation of adjacentstand is weak though spatial-autocorrelation analysis, detailed analysis showedthat most allele loci lack of spatial structure pattern...