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中文摘要：
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。
英文摘要：
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.
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