摘要
通过分析不同苗龄红松幼苗在控制温度和光照条件下叶性状的变化差异,以及各控制因素交互作用对红松幼苗叶性状的影响程度和红松叶性状的线性相关关系,探讨红松幼苗叶性状响应气候环境因素变化的特征和所采取的物质分配上的变化策略。实验采取人工气候箱培养红松幼苗,设置3组温度为10、20、30℃,每组温度下设置有效光照辐射4组:45.3、90.5、181.1、271.6(μmol m^(-2)s^(-1)),每组观测苗龄1—4a。观测性状为:比叶重(LMA)、单位面积光合能力(A_(area))、单位质量叶氮含量(N_(mass))和单位质量叶磷含量(P_(mass))。结果显示:(1)红松幼苗的LMA、A_(area)、N_(mass)、P_(mass)受到温度、光照和苗龄的影响,各控制组叶性状间差异显著(P<0.05);(2)温度、光照和苗龄对红松幼苗叶性状的交互作用效应显著(P<0.05),影响程度依次为:苗龄>温度>温度×光照×苗龄>光照>光照×苗龄>温度×光照>温度×苗龄;(3)LMA与温度和苗龄呈正相关性,A_(area)与苗龄呈正相关性,与温度呈负相关性,N_(mass)与温度、光照、苗龄、LMA和A_(area)均呈负相关性,P_(mass)与温度、N_(mass)呈正相关性而与苗龄和LMA呈负相关性。通过结果分析可以得出以下结论:(1)红松幼苗叶性状对温度、光照和苗龄3个因素均有明显响应但响应程度不一,影响性状差异的主要因素是温度和苗龄,光照在其温度和苗龄二者的作用基础上对性状产生影响;(2)红松幼苗叶性状之间的线性关系实际反映的是对温度、光照和苗龄响应的结果,叶性状间的密切联系反映出叶片在响应环境因素时所采取的分配策略的调整,其目的是维持植物体内同化作用和异化作用的平衡,确保红松幼苗稳定生长。
In the present study, changes in leaf traits of Pinus koraiensis （Korean pine） seedlings in response to seedling age, temperature, and light conditions were investigated, as well as the correlation of these factors with Korean pine seedling leaf traits. Korean pine seedlings were cultivated in artificial climate chambers with three levels of temperature settings （10, 20, and 30℃） and four levels of effective light radiation applied to each temperature level （45.3, 90.5, 181.1, and 271.6 μmol m-2 s-1）; the observed seedlings in each group were aged between 1 and 4 years. The observed leaf mass traits were per area （LMA）, area-based photosynthetic capacity （Aarea）, mass-based nitrogen concentration （Nmass）, and mass-based phosphorus concentration （Pmass）. Our results showed that （1） LMA, Aarea, Nmass, and Pmass of Korean pine seedlings were affected by temperature, light, and seedling age. The differences in leaf traits among different controlled groups were statistically significant （P 〈 0.05）. （2） Temperature, light, and seedling age in combination affected Korean pine seedling leaf traits. The order of significance of effects was seedling age 〉 temperature 〉 temperature×light×seedling age 〉 light 〉 light×seedling age 〉 temperature×light 〉 temperature×seedling age. （3） LMA was positively correlated with temperature and seedling age; Aarea was positively correlated with seedling age but negatively correlated with temperature; Nmass was negatively correlated with temperature, light, seedling age, LMA, and Aarea; and Pmass was positively correlated with temperature and Nmass but was negatively correlated with seedling age and LMA. Our results suggest the following：（1） Korean pine seedling leaf traits responded to all three studied factors （temperature, light, and seedling age） to differing degrees. The main factors that caused differences among traits were temperature and seedling age, while the effect of light was influenced by these two fa
出处
《生态学报》
CAS
CSCD
北大核心
2017年第17期5662-5672,共11页
Acta Ecologica Sinica
基金
国家"十二五"科技支撑计划研究(2012BAC01B03)
关键词
红松幼苗
控制实验
比叶重
光合能力
叶氮磷含量
因素交互作用
Korean pine seedlings
controlled experiments
leaf mass per area
photosynthetic capacity
leaf nitrogen andphosphorus concentrations
factor interaction
