克拉玛依农业综合开发区外围荒漠植物群落分布的土壤环境排序解释

应用DCA数量排序方法，在群落水平上对克拉玛依农业综合开发区外围荒漠植物群落与土壤环境因子之间的关系进行了分析，并对排序轴进行了逐步回归分析。结果表明，该地区植物群落分为盐穗木群落、梭梭群落和白梭梭群落三个典型群落类型。通过排序分析土壤盐渍化与盐穗木群落相关性较强，梭梭群落与土壤肥力、白梭梭群落与土壤酸碱性具有明显的相关性。在梭梭＋白梭梭群落的过渡带上，土壤各因子含量也随之发生过渡变化，而盐穗木群落与梭梭、白梭梭群落有明显的界线，表现出了恶劣生境下的物种趋同性。综合分析表明了在隐域条件下土壤因子含量与植被格局的一致性，也反映了植被对生境的依赖性。

Soil Environmental Ordination Interpretation on Distribution of Desert Plant Community in Karamay Agricultural Comprehensive Developmental Region

This thesis studied the relationships between desert plant community and soil environmental factors in Karamay Agricultural Comprehensive Developmental Region using the DCA quantitative ordina- tion analysis at the community scale.The results indicated that desert plant communities could be divided into Halostachys caspica community, Haloxylon persicum community and Halo,rylon ammodendron community in the outer space of Karamay Agricultural Comprehensive Developmental Region through stepwise regression analysis in terms of ordination axis.Analysis of ordination showed that the there were significant correlations between Halostachys caspica community and soil total salinity,the correlation be- tween Haloxylon am rnodendron community and soil fertility was apparent;there were explicit correlation between Haloxylon persicum community and soil alkalescence.Soil factors changed gradually in the transi- tion community between Haloxylon a mmodendron community and Haloxylon persicum community.Fur- thermore,there were clear boundaries between Halostachys caspica community and Haloxylon ammo- dendron community and Haloxylon persicurn community, suggesting their homoplasy of species in adverse living environment.The comprehensive analysis indicated that the content of soil factors and vegetation pat- tern were consistent with each other in the indistinct conditions, also reflected the dependence of vegetation to living environment.