摘要
研究植物群落叶片功能性状沿环境梯度的变化可以更好地认识群落对环境的适应机制,海拔梯度在较小的空间范围内浓缩了不同的群落类型和环境梯度,是研究和理解群落与环境关系的理想场所。以神农架海拔梯度上4种典型森林为研究对象,分析了4种典型森林优势乔木树种的LMA、LDMC、Narea、Nmass、叶片厚度及叶片叶绿素含量等主要叶片功能性状随海拔的变化规律及各功能性状之间的相关性,以期从叶片功能性状角度揭示群落适应环境的机制。研究结果表明:在780—1970 m范围内,神农架海拔梯度上典型森林乔木优势种叶片的、Narea和叶片厚度随海拔升高而下降,而海拔2570 m的亚高山针叶林的LMA、Narea和叶片厚度最高,分别为187.37 g/cm2、1.92 g/m2和385.31 um,且针叶林的LMA是常绿阔叶林的2倍、落叶阔叶林的3.7倍;除常绿落叶阔叶混交林的Nmass小于落叶阔叶林外,Nmass随海拔升高(780—2570 m)而下降;海拔最高(2570 m)的针叶林和海拔最低(780 m)的常绿阔叶林的LDMC和叶绿素含量最高,分别为454.93 g/kg、407.64 g/kg和48.84、44.12;而海拔介于二者之间的常绿落叶阔叶混交林和落叶阔叶林的LDMC和叶绿素含量则最低,分别为338.93 g/kg、337.3 g/kg和38.73、38.19。叶片各功能性状之间存在着显著的相关性:叶片厚度与LMA/LDMC及LMA显著正相关。叶片叶绿素含量与Narea显著正相关。LMA与LDMC、Narea、叶片厚度、叶绿素含量显著正相关,LDMC与Narea、叶绿素含量、叶片厚度显著正相关,Narea与叶片厚度、叶绿素含量显著正相关,叶片厚度、叶绿素含量显著正相关。本研究进一步表明,随着海拔梯度上升环境条件的变化,森林群落不同物种功能性状间的相互作用共同决定着森林群落对环境的适应性。
Exploring the variation of leaf functional traits of plant community along environmental gradient can help us get a better understanding of the adaptive mechanism of the plant communities′ response to environment.Altitudinal gradients could be used as powerful naturally formed experiments for testing ecological response of forest community to environment.Four typical types of forests along altitudinal gradients were investigated to analyze the variations of chlorophyll content,leaf dry mass content,leaf mass per area,leaf thickness,nitric concentration per unit area,nitric concentration per unit mass and their correlations in Mt.Shennongjia.Based on the analysis,we tried to reveal the adaptive mechanism of plant communities′ response to environment.The results shown that leaf functional traits including LMA,Nmass and leaf thickness declined with the increase of altitude in the altitude ranging from 780m to 1970m.While LMA,Nmass and leaf thickness content of sub-alpine coniferous forest（2570 m） reached the maximum with 187.37g/cm2,1.92g/m2 and 285.31μm,respectively.LMA of sub-alpine coniferous forests was twice as much as that of evergreen deciduous broad-leaved forests,3.7 times as much as deciduous broad-leaved forests.Nmass declined with the increase of altitude（780—2570 m） except the Nmass of mixed evergreen and deciduous broad-leaved forests which was less than that of deciduous broad-leaved forests.The maximum chlorophyll content of sub-alpine coniferous forests（2570 m） and evergreen broad-leaved forests（780 m） were 48.84 and 44.12,and the maximum of LDMA were 454.93g/kg and 407.64g/kg for the same forests.Chlorophyll content and LDMA for Mixed evergreen and deciduous broad-leaved forests and deciduous broad-leaved forests in which the altitudes are between sub-alpine coniferous forests and evergreen broad-leaved forests had minimum chlorophyll content of 38.73 and 38.19,and LDMA of 338.93g/kg and 337.3g/kg.There existed significant correlation among the leaf functional traits.The resu
出处
《生态学报》
CAS
CSCD
北大核心
2011年第21期6420-6428,共9页
Acta Ecologica Sinica
基金
国家自然科学基金(30870416)
国家973课题(2010CB951301)
植被与环境变化国家重点实验室项目"成熟林的重要功能过程对环境变化响应联网研究"
