摘要
以贡嘎山常绿落叶阔叶混交林5种主要树种为研究对象,分析其叶片比叶面积(SLA)、叶干重(LDW)、碳(C)、氮(N)、磷(P)含量、同位素丰度(δ13C、δ15N)等叶属性特征,阐明常绿落叶阔叶混交林主要物种叶片性状的差异以及各种性状之间的相关关系,揭示主要树种叶片的水分和养分利用效率之间的关系以及这种关系对该群落中主要树种共存的影响机制。结果表明:贡嘎山常绿落叶阔叶混交林常绿树种与落叶树种比叶面积存在显著差异,叶片C含量与N、P含量呈显著负相关,N含量和P含量呈显著正相关;SLA与N含量、N∶P呈显著正相关关系,与δ13C、C含量、C∶N呈显著负相关关系,而与P相关性不显著;叶片δ13C与C∶N相关性不显著;SLA较高的叶片具有较高的叶片N含量,较低的叶C含量、氮素利用效率(NUE)和水分利用效率(WUE);叶片的WUE和NUE之间不存在权衡关系,未采用水氮耦合的权衡机制以适应潮湿多雨的环境;孑遗植物康定木兰(Indigofera souliei)和连香树(Cercidiphyllum japonicum)均采用异于非孑遗物种的养分利用策略,形成生态位的分化而共存于群落。
Five main species of a mixed evergreen and deciduous broad-leaved forest in Mt. Gongga were employed to investigate their plant functional traits including specific leaf area （ SLA）, leaf dry weight （ LDW）, leaf carbon （ C）, nitrogen （N） and phosphorus （P） concentrations, and leaf isotope （δ^13C, δ^15N）. Our aims were to explore the difference of the leaf functional traits of the main species and their interrelations, and reveal the relationship between nutrient use efficiency and water use efficiency of these species and how such relationship may affect the growth and nutrient cycles of these species. The results showed that a significant difference in SLA was found between evergreen and deciduous species. Leaf C concentration was negatively re- lated with leaf N and P concentrations. Significant positive relationships between leaf N and P concentrations and between C ： N and C ： P were observed. In addition, leaf SLA increased with increasing leaf N concentration and N ： P ratio, but decreased with increasing C concentration, δ13C, and C ： N ratio. No relationship between δ13C and C ： N ratio was detected in the study. Moreover, our results showed that plants with the higher SLA exhibited the higher leaf N, but the lower leaf C concentration, nitrogen use efficiency and water use efficiency. There was no tradeoff between WUE and NUE for the main species in the mixed evergreen and deciduous broadleaved forest, indicating that the water and nitrogen coupling mechanism was not employed in the humid environment. The relict plants （Indigofera souliei and Cercidiphyllum japonicum） took a different nutrient use strategy compared with other non-relict tree species, and formed niche differentiation thus co-existing in the community.
作者
彭阿辉
王根绪
罗辑
杨阳
冉飞
杨燕
PENG A-hui WANG Gen-xu LUO Ji YANG Yang RAN Fei YANG Yan(Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China University of Chinese Academy of Sciences, Beijing 100049, China）.)
出处
《生态学杂志》
CAS
CSCD
北大核心
2016年第10期2599-2605,共7页
Chinese Journal of Ecology
基金
国家自然科学青年基金项目(31100323)
中国科学院重点部署项目-创新团队国际合作伙伴计划项目(KZZD-EW-TZ-06)
中国科学院山地表生过程与生态调控重点实验室开放研究基金项目资助
关键词
叶功能性状
比叶面积
水分利用效率
常绿落叶阔叶混交林
leaf functional traits
specific leaf area
water use efficiency
mixed evergreen and deciduous broad-leaved forest
