华南地区6种阔叶幼苗叶片形态特征的季节变化  

Seasonal change of leaf morphological traits of six broadleaf seedlings in South China

作　　者：薛立[1] 张柔[1] 奚如春[1] 郭淑红[1] 杨振意[1] 刘斌[1] 韦如萍[1,2] 

机构地区：[1]华南农业大学林学院,广州510642 [2]广东省林业科学研究院,广州510520

出　　处：《生态学报》2012年第1期123-134,共12页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(30872052);广东省林业局资助项目(F09054)

摘　　要：为了了解6种阔叶幼苗叶形态的季节变化规律和气候对其的影响,对山杜英、米老排、樟树、海南红豆、红花油茶和红锥6种幼苗叶长和叶宽的相关性和叶片的比叶重变化和其与气候的关系进行了研究,结果表明:幼苗各月份的叶长和叶宽呈极显著正相关。根据相关系数把6种幼苗分为:a),叶长和叶宽的相关性随季节变化型,包括山杜英、红花油茶、海南红豆、红锥;b),叶长和叶宽的相关性稳定型,有樟树和米老排。6种幼苗的叶长和叶宽相关系数与月降雨量成线性关系,与月平均气温及光照时间呈二项式关系。6种幼苗叶片的比叶重随幼苗种类和季节而变化,新叶的比叶重上半年比下半年变化大,老叶全年变化较小,上半年新叶的比叶重比老叶低,下半年两者相近。红花油茶新叶和老叶的平均比叶重明显大于其余5种幼苗。6种幼苗的比叶重与降雨量、平均气温和光照时间存在二项式关系。Leaf traits reflect use-efficiency strategies in plants.The manner in which leaf traits change within or across species can profoundly affect plant growth,reproduction and ecosystem function.The morphological characteristics of plant leaves are greatly influenced by environmental factors associated with climate and light.Morphological plasticity plays an important role in resource acquisition of plants and variations in leaf trait is of major importance for plant adjustment to resource availability.Changes in temperature and rainfall patterns are predicted to significantly influence morphological plasticity of plant leaves.Leaf morphology of native vegetation has often been interpreted as a sensitive indicator of environmental conditions.The relationship between climate and leaf plasticity is universal and particularly important in certain ecosystems,because of their enormous size and correspondingly vast stores of carbon.Tree ecologists with an interest in leaf dynamics have typically concentrated on assessing a limited number of variables,such as leaf length and width,leaf area and leaf weight.However,assessing the leaf dynamics of forest trees is especially challenging since turnover is often high and there is abundant variation in leaf phenotypic characteristics between and within individuals,populations and species.The correlation between leaf length and leaf width and changes of leaf mass per area（LMA） were studied in seedlings of Elaeocarpus sylvestris,Mytilaria laosensis,Cinnamomum camphora,Camellia semiserata,Ormosia pinnata and Castanopsis hystrix,in order to understand change of leaf shape of the six broadleaf seedlings and climate effects on their leaf changes.The very significant correlation existed between leaf length and leaf width of the six seedlings.The month changes of correlative coefficients of most seedlings were intimate with season change.The six seedlings were divided into two types according to leaf similarity change： a）,correlation change with season including E.sylvestris,C.sem

关 键 词：阔叶树种 叶片性状 相关关系 比叶重 季节变化 气候影响 

分 类 号：S718.4[农业科学—林学]