Abstract:

The effects of defoliation on biomass, height and growth rate in Helianthus tuberosus L.were studied during vegetative growth stage and squaring stage. The results showed:the underground biomass showed different regularity with the ways of leaves removal. the highest value was obtained in the ways of removing all leaves in lower 1/3 part of the plant; the highest aboveground biomass and total biomass yield was obtained at the ways of removing all leaves in even number of the plant;In the same ways of removing leaves, the plant height decreased with the increase of the number of removed leaves under different stage treatment, the growth rates were not significantly different among treatmentsduring both vegetative growth stage and squaring stage; They all decreased with time.

Key words: Helianthus tuberosus L., Defoliation, Biomass, Height, Growth rate

摘要：

本文通过对营养期和现蕾期菊芋（Helianthus tuberosus L.）进行去叶处理，探讨去叶对菊芋株高、生长速率和生物量的影响。结果表明：营养期去除1/3叶片菊芋地下生物量达到最高值；现蕾期去叶，地上生物量和总生物量均以去除偶数叶最高；相同叶片去除方式下，不同时期去叶株高均随去叶数量的增加而降低；不同时期各处理菊芋生长速率均随测定时间的延迟而降低。

关键词: 菊芋, 去叶, 生物量, 株高, 生长速率