摘要
[目的]了解不同生活型榕属植物叶功能性状对生境条件的适应性。[方法]以中国科学院西双版纳热带植物园榕树专类园的11种榕树为研究对象,对含水量、比叶面积、叶片厚度、叶脉密度、气孔密度、气孔大小、净光合速率7个叶功能性状进行了研究。分析了半附生榕树与非附生榕树的叶功能性状差异,根据叶功能性状对11种榕树进行了PAM聚类,并结合研究对象的原生境,从叶功能性状的角度阐释其生存对策。[结果]半附生榕树与非附生榕树的含水量与净光合速率无显著差异,但半附生榕树的比叶面积、叶片厚度和气孔密度显著低于非附生榕树,而叶脉密度与气孔大小显著高于非附生榕树;根据7种叶功能性状对11种榕树通过PAM聚类聚成与生活型相一致的2个聚类簇。[结论]与非附生榕树相比,半附生榕树通过增加叶脉密度、气孔大小及降低比叶面积,提高光合效能,进而适应其水分、养分更加胁迫的微环境。
[Objective]In order to understand how Ficus plants with different life forms adapt to their habitat environments in terms of leaf functional traits.[Method]Took 11 Ficus species as the research objects in the special Ficus garden at Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,and 7 leaf functional traits containing leaf water content(LWC),specific leaf area(SLA),leaf thickness(LT),vein density(VD),stomatal density(SD),stomatal size(SS),net photosynthetic rate(Pn)were studied.This study analyzed differences in leaf functional traits between hemiepiphytic Ficus and nonepiphytic Ficus,did PAM clustering according to leaf functional traits of 11 Ficus species,and explained figs’survival strategies from the perspective of leaf functional traits in combination with research objects’native habitats.[Result]The results showed that:there was no significant difference in leaf water content and net photosynthetic rate between hemiepiphytic Ficus and nonepiphytic Ficus,but the specific leaf area,leaf thickness and stomatal density of hemiepiphytic Ficus were significantly lower than those of nonepiphytic Ficus,while vein density and stomatal size were significantly higher than those of nonepiphytic Ficus;according to 7 kinds of leaf functional traits,11 kinds of Ficus were clustered into 2 clusters consistent with life forms by PAM clustering.[Conclusion]The results suggested that compared with nonepiphytic Ficus,hemiepiphytic Ficus improved photosynthetic efficiency by increasing leaf vein density and stomatal size and reducing specific leaf area,thus adapted to the microenvironment under more water and nutrient stress.
作者
张谦
张翼飞
ZHANG Qian;ZHANG Yi-fei(Key Laboratory of Tropical Forest Ecology,Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Mengla,Yunnan 666303;University of Chinese Academy of Sciences,Beijing 1000049)
出处
《安徽农业科学》
CAS
2022年第24期82-85,共4页
Journal of Anhui Agricultural Sciences
关键词
半附生榕树与非附生榕树
叶功能性状
叶脉密度
气孔大小
光合效能
Hemiepiphytic and nonepiphytic Ficus
Leaf functional traits
Vein density
Stomatal size
Photosynthetic efficiency
