不同海拔梯牧草生物型种群构件的生物量分配策略

Biomass allocation strategies of Phleum phleoides populations at different altitudes

摘要:

为了解不同海拔条件下梯牧草各构件的生物量分配特征,在梯牧草分布区域,按照不同海拔梯度设置样地,对成熟期梯牧草种群个体构件生物量分配策略进行分析。结果表明:(1)不同海拔地段,梯牧草各构件生物量大小均表现为茎＞根＞穗＞叶;生物量分配为营养分配＞储藏分配＞繁殖分配;(2)不同海拔地段,根、茎、叶及穗生物量对梯牧草株体生物量的贡献率不同,海拔2 000 m处,生物量对株体生物量的贡献率均最大;(3)各海拔条件下,梯牧草种群根、茎、叶及穗生物量与全株生物量呈幂函数的正相关关系,各构件生物量均随单株大小的增加而增加;(4)梯牧草在生长过程中,构件大小与单株个体大小呈异速生长关系,不同海拔下,呈显著或不显著的异速生长变化。研究结果可为优异种质筛选提供背景资料。

Abstract:

In order to understand the biomass allocation to different components in Phleum pretense L.at different altitudes,a typical sampling method was used to determine the biomass allocation of each individual component at the maturity stage.At different altitudes,the biomass of different components of Phleum pretense L.followed the order of stem＞root＞earth＞leaf,and nutrition allocation＞storage allocation＞reproduction allocation.At different altitudes,the contribution of each component to the biomass of Phleum pretense L.was different.The growth and development of Phleum pretense L.was best at an altitude of 2000 m.Correlation analysis at various altitudes showed that the biomass of roots,stems,leaves and spikes was in a power function of the total biomass per plant.Each individual biomass component increased with the increase of the plant size.During the growth of Phleum pretense L.,the size of each individual biomass component and the size of the entire plant showed significant or insignificant allometric growth relationship at different altitudes.