3种阔叶幼苗叶片形态特征的季节变化

为了了解叶形态变化的规律，为苗木培育提供理论依据，笔者通过测定黎蒴、火力楠、枫香3种幼苗叶片的长度、宽度、叶面积和叶干重的方法，对这3种幼苗叶长和叶宽的相关性、叶面积与干重的相关性、比叶重的季节变化进行研究。结果表明：叶长和叶宽呈极显著正相关，黎蒴和枫香的叶长与叶宽相关性随季节变化，而火力楠的规律性不强。新叶和老叶的面积与干重极显著相关。新叶的比叶重上半年变化较大，下半年变化平缓，一般2－4月出现最低值；上半年新叶的比叶重比老叶低，下半年两者相近。3种阔叶幼苗叶片的相似性和比叶重随季节发生变化，幼苗叶片干物质的积累随叶面积的扩大而增加，叶片干重与叶面积的相关性与树种和叶龄有关。

Seasonal Change of Leaf Trait of Three Broadleaf Seedlings

The methods of determining leaf length,leaf width,leaf area and leaf dry weight were used in seedlings of Castanopsis fissa,Michelia macclurei and Liquidambar formosana in order to understand change of their leaf shape and supply a theory basis for these seedlings culture,the correlations between leaf length and leaf width as well as between leaf area and leaf dry weight,and seasonal change of specific leaf weight (SLW) were studied in the three seedlings.The very significant correlation existed between lea...