壳斗科五树种幼苗叶片结构型性状及其相关关系

通过种子的人工采集、低温沙藏和温室培育后,将幼苗移栽到环境条件相同的同质园中自然生长,研究了中亚热带壳斗科丝栗栲(Castanopsis fargesii)、苦槠(C.sclerophylla)、锥栗(Castanea henryi)、板栗(C.mollissima)和麻栎(Quercus acutissima)2年生幼苗生长季节的叶面积、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7种结构型性状的差异及其相关关系。结果表明:(1)在5树种幼苗中,锥栗幼苗的叶面积和比叶面积最大、叶氮浓度最高,其叶干物质含量最低;丝栗栲幼苗的叶面积最小、叶氮浓度和叶磷浓度最低;苦槠幼苗的叶厚度和比叶面积最小,其叶干物质含量最高;板栗幼苗则是叶厚度最小;同时5树种幼苗叶片的氮磷比均无显著差异(P0.1)。(2)Pearson相关和线性回归分析表明,壳斗科5树种幼苗的叶面积与叶氮浓度极显著正相关(P0.01),并与比叶面积显著正相关(P0.05);叶厚度与比叶面积极显著负相关(P0.01),其与叶干物质含量显著正相关(P0.05);比叶面积与叶干物质含量极显著负相关(P0.01),并与叶氮浓度极显著正相关(P0.01),同时与叶磷浓度显著负相关(P0.05);叶氮浓度与叶干物质含量、叶磷浓度分别为显著负相关(P0.05)和显著正相关(P0.05)。该研究结果表明壳斗科5树种幼苗叶片的7种结构型性状表现出了一定的种间差异性,但同一结构型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结构型性状间的相关性及其显著程度不同。

Leaf structure traits and their correlation of five tree seedlings of Fagaceae family

After sand reservoir in the condition of low temperature and cultivation in the greenhouse of the collected seeds, 5 tree species(Castanopsis fargesii, C. sclerophylla, Castanea henryi, C. mollissima and Quercus acutissima)seedlings of Fagaceae family in the mid-subtropical zone of China were transplanted into the common garden. The leaf size, leaf thickness, specific leaf area, leaf dry matter content, leaf nitrogen concentration, leaf phosphorus concentration, ratio of leaf nitrogen and phosphorus concentration and their correlation of two-year old seedlings in the growing season were investigated in this paper. The results were as follows:(1)The leaf size and specific leaf area of Castanea henryi were the maximum, its leaf nitrogen concentration was the highest and its leaf dry matter content was the lowest. The leaf size of Castanopsis fargesii was the minimum, its leaf nitrogen concentration and leaf phosphorus concentration were the lowest. The leaf thickness and specific leaf area of C. sclerophylla was the minimum and its leaf dry matter content was the highest. For C. mollissima seedlings, the leaf thickness was the minimum. In the meanwhile, there was no significant difference of the ratio of leaf nitrogen and phosphorus concentration among the 5 tree seedlings.(2)Pearson and linear regression analysis indicated that leaf sizes of the 5 tree seedlings were in a highly significant positive correlation with leaf nitrogen concentration(P<0.01)and significant positive correlation with specific leaf area(P<0.05). The leaf thickness was in a highly significant negative correlation with leaf size(P<0.01)and significant positive correlation with leaf dry matter content(P<0.05). The correlation among specific leaf area and leaf dry matter content, leaf nitrogen concentration was highly significant negative and positive respectively(P<0.01). At the same time, it was significantly and negatively correlated with leaf phosphorus concentration(P<0.05). The correlation among leaf nitrogen concentration and leaf dry matter content, leaf phosphorus concentration was significant negative and positive respectively(P<0.01). The results indicated that the seven leaf structure trait indicators of the 5 tree seedlings of Fagaceae family exhibited a certain interspecific difference, but the order of the same indicator and its difference significance were different; while the correlation of the seven leaf structure trait indicators among all of the five tree seedlings was not the same.