靖王高速路基南北边坡柠条种群生物量分配与生长的对比研究

A Comparison Study on the Biomass Allocation and Growth Increment of Caragana Microphylla Population at Southern and Northern Slope of Jing-wang Expressway Roadbed

以靖王高速路基南、北边坡的柠条种群为对象,依据样地调查结果,通过生长量、生物量及其分配等指标的对比分析,试图揭示坡向对种群生长的影响以及种群对不同坡向的生态适应对策。结果表明,北坡的土壤含水量、种群生长量及生物量显著高于南坡种群,而同一坡向种群之间没有显著差异。同时,种群通过生物量分配调节对坡向差异做出响应。在水分条件较差的南坡,种群将更多的生物量投资于地下部分生长,以利于获取更多的土壤水分资源;在水分条件较好的北坡,种群将更多的生物量投资于地上部分生长,以利于对已占据生境的巩固和利用。

In hope of revealing the effect of slope direction on population growth and the adaptive strategy of population at different directional slope, Caragana microphylla population at southern and northern slope of Jing-wang expressway roadbed are investigated and compared with growth increment, biomass and its allocation. The results show that the soil moisture, the growth increment and the biomass of population at northern slope are significant higher than that of the population at southern slope. However, the characteristics mentioned above are without significant differences between the populations at the same directional slope. And the population responds to the difference of slope direction by the regulation of biomass allocation. The population at southern slope allocates more biomass to underground modules, this is beneficial to the population obtaining more soil moisture. The population at northern slope allocates more biomass to aboveground modules, this is beneficial to the population consolidating and utilizing occupied habitat.