不同光照质量和刈割强度对小糠草无性繁殖特性的影响

Influence of different clipping intensity and R/FR ratio in light radiation on tillering of weeping lovegrass.

本实验于 1996年在美国德克萨斯理工大学草原、野生动物和渔类系的温室和实验室中进行 .实验材料均为盆栽小糠草 .实验设计为在自然光照下 (R/FR =1.1) ,以不同留茬高度 (10、15、2 0cm和不刈割 )作为不同刈割强度 ;用不同红光 /远红光比例 (R/FR =1.3和 0 .7)处理不同刈割强度的小糠草 ,观测不同处理对小糠草无性繁殖特性的影响 .结果表明 ,小糠草净增蘖数随刈割强度增加而减少 ;除不刈割处理外 ,光照质量变化 (R/FR的比例 )对分蘖性能影响不大 .所有刈割强度下都不存在分蘖的补偿性生长效应 ,但幼叶伸长速度随刈割强度的增大而加快 .可以认为小糠草应适度利用 ,强度利用或不利用均不利于该草生长发育 .

Pot experiment with weeping lovegrass was conducted laboratory in the Department of Rangeland,Wildlife and Fisheries Management,Texas Tech University in 1996.The plants grown in green house were used to study the effect of different clipping intensities on tillering, and those grown in laboratory were used to study the interaction between different R/FR(red/farred)ratio of the light reaching to the lower strata of the canopy and different clipping intensities on tillering.The results show that increasing clipping intensity decreased the net gain tillers,bt R/FR ratio had no significant effect on tillering,except no clipping treatment.The compensatory growth effect of tillering did not existed at all clipping intensities,but the elongation speed of young leaves quickened with clipping intensities.It is suggested that suitable utilization,intensified utilization and no utilization were all not beneficial to the growth and development of weeping lovegrass.