鼎湖山森林群落不同演替阶段优势种叶生态解剖特征研究

对南亚热带鼎湖山森林群落不同演替阶段8种优势树种进行了叶生态解剖学研究。观察的叶片解剖特征有：叶腹角质膜厚度、栅栏组织厚度、海绵组织厚度、叶背角质膜厚度及叶总厚度等。马尾松（Pinus massoniana)在针叶林群落和针阔叶混交林群落生境中，针阔叶混交林中叶片厚度变小，主脉管胞、树脂道平均直径变小。从针阔叶混交林演替阶段到季风常绿阔叶林演替阶段，锥栗（Castanopsis chinensis)叶片厚度、海绵组织厚度增加，栅栏组织厚度、P／S值（栅栏组织与海绵组织厚度比）减少；荷木（Schima superba)和黄果厚桂（Cryptocarya concinna)叶片厚度、栅栏组织厚度、叶腹及叶背角质膜厚度差异显著；从针阔叶混交林演替阶段到季风常绿阔叶林演替阶段，锥栗、荷木、黄果厚寺叶片厚度和栅栏组织厚度等差异均显著。不同生境下林内气温、相对湿度、光合有效辐射等小气候特征是叶片结构特征差异的主要影响因子，叶片结构差异反映了叶片结构在一定程度上对生境的适应。

Ecoanatomical Study on Leaf Characteristics of Dominant Species in Different Succession Stages of Forest Communities in Dinghushan

Leaf ecoanatomicalcharacteristicswere studiedof eightdominantspeciesin three successional stagesof forestcommunityin Dinghushan,Guangdong,China.Thetrendof successionof the communitiesin Dinghushanwas from coniferousforestdominatedby Pinus massoniana to coniferousandbroadleavedmixedforestdominatedby Pinus massoniana,Schima superba,Castanopsis chinensis and Cryptocarya concinna,and to monsoonevergreenbroadleavedforestdominatedby Cryptocarya concinna,C.chi nen sis,Castanopsis chinensis,Schima superba,Syzygium rehderianum,Aporosa yunnanensis andBlastus cochinchinensis.In thispaper,thestudyof leafanatomyincludedthe diterminationof leafthickness,adaxialandabaxialcuticularthickness,palisadeandspongytissues thickness,as wellas tracheidandresinductdiameters.As comparedto coniferousforest,thethickness of needles,and thicknessof adaxialand abaxialcuticlesof Pinus massoniana in mixedforestwere thinner,andthediametersof tracheidsandresinductsweresmaller.As comparedto mixedforest, laminathicknessand spongytissuethickness(S)of Castanopsis chinensis increasedin monsoon evergreenbroadleavedforest,whereaspalisadetissuethickness(P),andP/Sreduced.As forSchima superba andCryptocarya concinna,laminathickness,P andS thickness,andP/Salldecreasedto a certainextentin monsoonevergreenbroadleavedforest.Significantdifferenceswereobservedin needle thickness,adaxialandabaxialcuticlesthicknessin Pinus massoniana betweenconiferousforestand mixedforest.Such differences were also seen in laminathicknessand P thicknessin Castanopsis chinensis,Schima superba andCryptocarya concinna betweenmixedforestandmonsoonevergreen broadleavedforest.