【摘要】 平茬萌蘖是中国沙棘种群更新的有效方式,但其中的生态学机制并不清楚,为此,以样地每木检尺资料为基础,以"空间差异代替时间变化法"及"样地编年序列法"原理为依据、以生物量投资与分配为指标,探讨了中国沙棘平茬更新的生态学机制.结果表明:①中国沙棘平茬萌蘖种群及其构件生物量积累过程均符合Logistic方程,可分为慢、快、慢3个阶段,但构件之间的生物量投资与分配具有明显差异;②通过构件之间的生物量投资与分配调节,中国沙棘实现了平茬后的萌蘖更新,尤其是萌蘖根的生物量投资具有"前置效应"和"主导效应";③地上与地下构件的生物量分配具有互补效应,即地下分配比例大时则地上分配比例小.因此,种群实施萌蘖更新过程中,必须在繁殖与生长之间做出权衡.更多还原

【Abstract】 Stumping sprout is an effective renewing way of Hippophae rhamniodes L.subsp.sinensis population,while its ecological mechanism is not clear.In this research,all individuals of the population at different succession stag were measured to study the mechanism by the theory of "spatial series substituting for time series" and "plots arranged with age",the biomass investment and distribution were used as indicators.The results showed that:① the biomass accumulation of the population and its modules was in accordance with the Logistic equation.The biomass accumulation of sprout population could be divided into slow stage,rapid stage and again slow stage,meanwhile among the modules,the investment and allocation of biomass was obvious different;② sprout renewing was achieved by the adjustment of biomass investment and allocation among modules,especially by the prepositional effect and leading effect of the biomass investment of the sprout;③ the biomass allocation of the modules aboveground and underground had supplementary effect,as the allocation aboveground was low when the biomass underground was high,so the population must establish a tradeoff between breed and growth during the stump renewing process.更多还原