干热河谷植物叶片,树高和种子功能性状比较

Comparison of leaf,height and seed functional traits of species in dry-hot valleys

植物功能性状(plant functional trait)是近年来生态学研究的热点。以云南怒江和澜沧江干热河谷36种木本植物为研究对象,选取比叶面积(SLA)、植株高(H)和种子干重(SM)3个功能性状,研究它们的相互关系,比较其在河谷间、河谷内的差异。结果表明:1)两个河谷内36种木本植物的以上3种功能性状间没有显著的相关性(P值分别为0.8739,0.5763,0.5517);2)河谷间的比叶面积存在显著差异(P=0.02944),植株高和种子干重无显著差异(P分别为0.4070,0.8867);3)两个河谷内木本植物功能性状中,种子干重差异最大,植株高次之,比叶面积最小。

Plant functional traits have been the focus of much recent ecological research.This research has three basic components：（1） constructing trait matrices;（2） exploring relationships among these traits;and（3） determining relationships between traits and environments.Plant functional traits are closely related with environmental factors,individuals and ecosystem structure.And the functional traits of plants can respond and adapt to the environmental change.Leaf functional traits are more closely related with biomass,resource acquisition and utilization,and resource use efficiency of plants.Plant height is often associated with competitive vigour,fecundity,and with the time intervals between disturbances.There are also important trade-offs between plant height and tolerance,or avoidance,of environmental stress.Interspecific variation in seed mass has an important taxonomic component with more closely related taxa being more likely to be similar in seed mass.Smaller seeds tend to be dispersed further,while larger seeds tend to produce seeding that are better able to establish,and survive environmental hazards.In this study,we measured specific leaf area（SLA）,plant height（H） and seed mass（SM） in 36 woody species form the dry-hot Nujiang and Lancangjiang valleys to to research the correlation of three functional traits.The variation of these three functional traits between and within the two valleys was also analyzed.There were no significant differences in specific leaf area（P=0.8739）,plant height（P=0.5763） or seed mass（P=0.5517）,But there were significant differences between the two valleys（specific leaf area,P=0.029）.With each valleys,the variation of seed mass was the greatest and specific leaf area the least.