摘要
老芒麦同龄种群以４个密度播种。分蘖数的增加，平均干重的增长以及源株和分蘖的死亡共同起作用调节种群的密度，这种调节属于低补偿效应的密度依赖性繁殖调节，它使分蘖种群的重量──密度关系值趋向于一个相似值而独立于播种密度。源株种群的重量──密度关系与－３／２法则相符，但分蘖种群则与之不符。源株种群的自疏线（ｒ＝１．１４）在第１年位于竞争自疏线（ｒ＝１．５）与竞争无自疏线（ｒ＝１）之间，但第２年自疏线斜率为０．７３，表明源株种群的自疏效应减少了。
The even-aged populations of Elymus sibiricus were sown at 4 densities. Thepopulation densities were regulated by the multiplcation of tillers, growth in their mean dryweight and death of genets and tillers together. This regulation belonged to the density-de-pendent fecundity of undercompensate effectiveness. It made the values of weight-density re-lationships in tiller population trend a constant value and became independent of sowing den-sity. The weight-density relationship conformed with -3/2 power law for genet populationsbut not for tiller populations. In first year, the thinning line of genet populations (r=1.14)was between the competiting selfthinning line (r=1.5) and competiting no self-thinning line(r=1). But the slope of 0.73 indicated that the efficiency of self-thinning in genet popula-tions were decreased in second year.
出处
《青海畜牧兽医杂志》
1995年第4期12-15,共4页
Chinese Qinghai Journal of Animal and Veterinary Sciences
关键词
密度调节
自疏
老芒麦
牧草
种群
结构
Density regulation, Self-thinning, Elymus sibiricus
