植物生长抽梢期和气候因子对株高生长影响

利用西双版纳热带植物园的热带植物物候观测资料和气候资料，通过对热带植物株高生长偏差、生长抽梢期和气候因子的分析，探讨了三者的关系。结果表明，热带植物生长抽梢期变长不一定影响株高生长，而且与株高生长偏差的关系也小于气候因子与株高生长偏差的关系。同时，热带植物生长抽梢期对气候因子和株高生长偏差之间关系的贡献很小。因此，可以认为热带植物的生长期对植被生产力的促进作用较弱。

The Influences of Shooting Duration and Climatic Factors on Plant Height Growth

The increased plant productivity during the past decades is hypothesized that warmer temperature promoted plant growth through extending the length of growing season. However, there are no experimental results supporting it. In the present study we examined the relationship among plant height growth, shooting duration and climatic variables for 11 tropical tree species. Our data showed that the longer shooting duration of tropical plants did not always promote plant height growth, and the climatic variables had stronger correlation with plant height growth than with shooting duration. In addition, the pathway analysis has been used to examine the contribution of shooting duration to the effect of climatic factors on plant height growth. The percentage of contribution of shooting duration was always less than 30%. We concluded that the increased growth period has limited influence on plant productivity for tropical trees.