3种木兰科植物幼苗叶片功能性状及关联性分析

研究了中亚热带木兰科乐昌含笑(Micheliachapensls)、深山含笑(Micheliamaudiae)和观光木(Tsoongiodendronodorum)2年生幼苗在生长季节的叶厚度、比叶面积、叶干物质含量、叶氮浓度、叶磷浓度和叶氮磷比6种叶片性状的种间差异及其相关性。结果表明:(1)3树种的6个叶片性状表现出了一定的种间差异性,观光木比叶面积、叶干物质含量、叶氮磷比最大,叶氮浓度最高;乐昌含笑叶干物质含量最小,叶氮浓度、叶磷浓度最低;深山含笑叶磷浓度最高,比叶面积、叶氮磷比最小,但3树种叶片的叶厚度无显著性差异(P0.1)。(2)3树种叶片的叶厚度与叶干物质含量极显著正相关(P0.01),比叶面积与叶氮浓度显著正相关(P0.05);叶干物质含量与叶磷浓度显著正相关(P0.05);叶氮浓度与叶磷浓度极显著正相关(P0.01)。(3)3树种叶片氮磷比均在9~12,且差异显著(P0.05)。研究结果显示,3种木兰科树种幼苗叶片的6种功能性状表现出了一定的种间差异性,但同一功能性状的大小顺序和种间差异的显著性不同;同时所有树种幼苗叶片各功能性状间的相关性及其显著程度不同。

The Leaf Functional Traits and their Correlation Analysis of Three Seedlings of Magnoliaceae

Interspecific differences in leaf thickness,specific leaf area,leaf dry matter content,leaf nitrogen concentration,leaf phosphorus concentration,ratio of leaf nitrogen and phosphorus concentration and their corre-lation of Micheliachapensls,Micheliamaudiae and Tsoongiodendronodorum two-year seedlings of Magnoliaceae in the mid-subtropical zone of China in the growing season were investigated.The results were as follows:(1) The six leaf trait indicators of the three trees exhibited a certain interspecific difference,among the three tree seedlings,the specific leaf area,leaf dry matter content and ratio of leaf nitrogen and phosphorus concentration of Tsoongiodendronodorum were the maximum,its leaf nitrogen concentration was the highest;the leaf dry mat-ter content of Micheliachapenslswas the minimum,its leaf nitrogen concentration and leaf phosphorus concentra-tion were the lowest;the leaf phosphorus concentration of Micheliamaudziae was the highest and its specific leaf area,ratio of leaf nitrogen and phosphorus concentration were the minimum ,but there was no significant differ-ence in leaf thickness of the three tree seedlings .(2)The leaf thickness of the three trees of Magnoliaceae had highly significant positive correlation with leaf dry matter content( P<0.01);the specific leaf area had positive correlation with leaf nitrogen concentration ( P<0.05);the leaf dry matter content had positive correlation with leaf phosphorus concentration ( P<0.05); the leaf nitrogen concentration had highly significant positive correla-tion with leaf phosphorus concentration ( P<0.01) .( 3) The ratios of leaf nitrogen and phosphorus concentra-tion of the three tree seedlings were all between 9 to 12 and their difference was highly significant ( P<0. 01) .The results indicated that the six leaf trait indicators of the three tree seedlings of Magnoliaceae exhibi-ted a certain interspecific difference,but the order of the same indicator and the significance of its difference were different;meanwhile,the correlation of the six leaf trait indicators among all of the three tree seedlings was not the same.