秦岭中段山脊油松叶功能性状差异及其对海拔梯度的响应  

Differences of Leaf Functional Traits of Pinus tabuliformis and Its Response to Altitude Gradient in the Middle of Qinling Mountains

作　　者：田岳梨 杨航 王芳玲 康海斌[1] 薛悦 王得祥[1] TIAN Yueli;YANG Hang;WANG Fangling;KANG Haibin;XUE Yue;WANG Dexiang(College of Forestry, Northwest A&F University, Yangling, Shaanxi 712100, China;Baoji Institute of Forestry Investigation and Planning, Baoji, Shaanxi 721001, China)

机构地区：[1]西北农林科技大学林学院,陕西杨陵712100 [2]宝鸡市林业调查规划院,陕西宝鸡721001

出　　处：《西北植物学报》2021年第2期300-309,共10页Acta Botanica Boreali-Occidentalia Sinica

基　　金：中央单位科技项目(20200331000001)。

摘　　要：山脊油松林是秦岭山地典型的群落类型之一,其在维持生物多样性及发挥生态服务功能等方面具有重要意义。该研究以山脊油松为对象,采用典型取样法研究了秦岭中段山脊油松10种叶功能性状沿海拔梯度的适应性变化规律。结果表明:(1)山脊油松1~3年生各叶龄叶的叶长(LL)、叶氮含量(LNC)、叶磷含量(LPC)和1年生叶的叶绿素[Chl(a+b)]含量较非山脊油松低,1年生叶的叶干物质含量(LDMC)和气孔密度(SD)较非山脊油松高。(2)山脊油松1~3年生各叶龄叶的叶厚(LT)、比叶面积(SLA)和1年生叶LPC均随海拔升高显著升高,1~3年生各叶龄叶的LL、LDMC、叶碳含量(LCC)、Chl(a+b)含量和1年生叶的SD均随海拔升高显著降低。(3)各叶龄叶的LNC与LPC均呈极显著正相关关系,1~2年生叶的LDMC与LPC均呈显著负相关关系,2~3年生叶的LL与LNC、LPC,LKC与LNC、LPC均呈显著正相关关系。研究认为,山脊独特的生境条件造就了山脊油松独特的生长策略,随着海拔升高,山脊油松表现出多元化的适应策略以应对环境因素的变化。Pinus tabuliformis on ridge as one of the typical plant communities plays an important role in biodiversity maintenance and ecological service function achievement.The objective of this study was to understand how leaf functional traits responded to altitudinal gradients.Ten P.tabuliformis on ridge traits were researched with typical sampling method in this study.The results showed that:(1)leaf length(LL),leaf nitrogen content(LNC),leaf phosphorus content(LPC)of 1-3-year-old leaf and chlorophyll concentration of 1-year-old leaf of P.tabuliformis on ridge were below non-ridge.However,the leaf dry matter content(LDMC)and stomata density(SD)of 1-year-old leaf of P.tabuliformis on ridge were higher than non-ridge.(2)The leaf funcation traits of P.tabuliformis on ridge,including leaf thickness(LT),specific leaf area(SLA)of 1-3-year-old leaf,LPC of 1-year-old leaf increased linearly with increasing elevation,but LL,LDMC,leaf carbon concentration(LCC),Chl(a+b)of 1-3-year-old leaf,SD of 1-year-old leaf decreased significantly with increasing elevation.(3)LNC was positively correlated with LPC of 1-3-year-old leaf;LDMC negatively correlated with LPC of 1-2-year-old leaf;LL was positively correlated with LNC,LPC of 2-3-year-old leaf;LKC was positively correlated with LNC,LPC of 2-3-year-old leaf.The unique habitat condition of the ridge has created the unique growth strategy of P.tabuliformis.P.tabuliformis on the ridge showed diversified adaptive strategies to adapting varing environmental factors associated with changes in altitude.

关 键 词：山脊油松 叶功能性状 海拔梯度 生长策略 秦岭 

分 类 号：Q944.3[生物学—植物学] Q945.79