华北落叶松-白杄混交林下更新幼苗幼树的功能特性  

Functional Traits of Naturally Regenerated Seedlings and Saplings of Larix principis-rupprechtii and Picea meyeri in the Mixed Stands

作　　者：刘宁[1] 张芸香[1] 郭晋平[1] 张秋枫[1] 

机构地区：[1]山西农业大学林学院,太谷030801

出　　处：《林业科学》2010年第7期22-29,共8页Scientia Silvae Sinicae

基　　金：国家自然科学基金项目(30470316);山西省自然科学基金(2006011084);山西省留办项目(2008079);山西农业大学科技创新基金(2009021)

摘　　要：设置林窗和林冠下2种光照环境作为主处理(透光率分别为100%和40%～60%),林下更新华北落叶松和白杄的2个树龄(3～4年和6～8年)为子处理,测量这2个树种的气体交换参数、比叶面积和茎干质量等功能特性,以了解这2个树种在不同年龄阶段对不同光环境响应的种间差异。结果表明:华北落叶松和白杄在气体交换参数、比叶面积和茎干质量上表现出显著的种间差异。虽然白杄的水分相关指标和形态特征表现出保守的资源利用策略,但在净光合速率指标上表现出高碳同化策略。随着光强的下降,华北落叶松在气体交换参数上表现出较大的正响应,白杄则偏向于在茎干质量上表现出较大的负响应。同时,随着树龄增加,华北落叶松在气体交换参数、比叶面积和茎干质量上均未表现出对光照的响应,而白杄的茎干质量和比叶面积则随光强下降,其响应模式与华北落叶松不同。因林下复杂的水分、土壤营养和竞争等因素的协同影响,此结果需进一步研究确认。Larix principis-rupprechtii and Picea meyeri mixed forest is a typical mountain forest in northern China. Understanding the functional traits of the regenerated seedlings and saplings of these two species is a key to know the current understory regeneration pattern. Light environment （two light regimes,gap and understory with 100% and 40%-60% transmittance levels） was selected as the main factor and plant age （ two level,3-4 and 6-8 years old） as sub-factor. The gas exchange parameters,specific leaf area （ SLA） and stem dry mass of the two species were measured to investigate the inter-specific variation at different ages in response to light. The results showed that there were significant differences in the gas exchange parameters,SLA and stem dry mass between Larix principis-rupprechtii and Picea meyeri. Picea meyeri showed a conservative resource use strategy in water relations and morphological traits,but a high carbon assimilation strategy in photosynthetic capacity. As light intensity decreased,the gas exchange parameters of Larix principis-rupprechtii increased and Picea meyeri had a negative response in stem dry mass. Meanwhile,as the tree age increased,Larix principis-rupprechtii did not respond to light in measured traits,while the stem dry mass and SLA of Picea meyeri decreased with light intensity,which showed a different response pattern from Larix principis-rupprechtii. Because of the concurrent effects of other understory factors,e. g. ,water availability,soil nutrients and competitions,the results should be further confirmed in future studies.

关 键 词：华北落叶松 白杄 光环境 发育阶段 气体交换参数 响应 功能特性 

分 类 号：S718.54[农业科学—林学]