Changes in the response of leaf traits in Pinus koraiensis (Korean pine) seedlings of different ages to controlled temperatures and light conditions
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 μnol 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;A 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 N 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 factors.(2) The correlation between Korean pine seedling leaf traits reflected their response to temperature,light,and seedling age.The close relationship between leaf traits is consistent with the allocation strategies that the leaves use in response to environmental factors,which maintain the balance between assimilation and respiration to ensure stable growth in Korean pine seedlings.
Korean pine seedlingscontrolled experimentsleaf mass per areaphotosynthetic capacityleaf nitrogen and phosphorus concentrationsfactor interaction
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