高速公路边坡不同地形部位沙打旺种群的生态适应对策研究

Study on the Adaptive Strategy of Astragalus adsurgens Population at Different Topographical Location of Expressway High-margin-slope

以高速公路边坡不同地形部位的沙打旺种群为对象,通过样地调查,分析了不同土壤水分和养分条件下沙打旺种群生长和生态适应对策。结果表明:随着土壤水分和养分储量的增大,茎、花、果的生物量比例增大,根系和叶片的生物量比例下降。在土壤水分和养分储量较大时,种群将更多的生物量分配于茎、花、果,丛内分枝数量多且个体高大,有利于种群对已占据生境的巩固和利用,提高了种群的适合度;在土壤水分和养分储量较小时,种群将更多的生物量分配于根系和叶片,丛内分枝数量少且个体矮小,降低了种内竞争,扩大了种群对环境资源的获取和利用范围。

Adaptive strategy arid growth of Astragalus adsurgens population at different topographical freeway slopes with different water and nutrient conditions were studied. The results showed that with the increase of soil moisture and nutrients, the biomass allocation of the plant populationt to stem, flower and fruit increased, and decreased to the root system and leaves to consolidate and efficiently use their habitats that they had occupiesd,and to promote their adaptability,featuring as producing more tiller and larger individual. Under the lower levels of soil moisture and nutrient reserves, the population allocates more biomass to root and leaves and produce fewer tiller and smaller individual, to be beneficial to the population to reduce intra-specific competition and enlarging the scope of resources obtaining.