论文部分内容阅读
【目的】研究植物叶功能性状特征,以了解植物生存的适应性策略。【方法】以松山地区油松天然林及人工林为对象,通过测定不同叶龄油松的比叶面积(SLA)、叶干物质含量(LDMC)、叶氮量(LNC)、叶磷量(LPC)及氮磷比(m(N)∶m(P),缩写为N/P),得到不同坡向上不同径级油松异龄叶的功能性状特征。【结果】(1)在天然林和人工林内,不同坡向油松的SLA、LDMC差异均显著(P<0.05),SLA在阴坡较高,而LDMC在阳坡较高。(2)SLA与LDMC呈显著负相关(P<0.01,其中当年生叶相关系数r=-0.86,往年生叶r=-0.84);LPC与m(N)∶m(P)呈现显著负相关(P<0.01,当年生叶r=-0.47,往年生叶r=-0.70);LNC与m(N)∶m(P)呈显著正相关(当年生叶P<0.05,r=0.23;往年生叶P<0.01,r=0.45)。(3)不同发育阶段中,小径级油松的SLA显著高于中、大径级(P<0.05),LDMC趋势则相反,且大径级的LDMC最大。(4)各径级中当年生叶的LNC和m(N)∶m(P)均低于往年生叶相应值,但其LPC均比往年生叶的高。【结论】坡向显著影响油松叶对资源和能量的分配策略,阴坡叶的比叶面积性状特征明显,而阳坡叶注重叶干物质含量的积累;松山地区油松营养限制类型为氮限制,且新叶生长更易受氮限制。异龄叶在不同坡向和各个发育阶段的叶功能性状,表明该地区油松为了最大限度地减少环境的不利影响而采取了适应性权衡对策。
【Objective】 The objective of this study is to study the traits of plant leaf traits and understand the adaptive strategies of plant survival. 【Method】 The natural forest and artificial plantation of Pinus tabulaeformis forest in Songshan were used as test objects to measure the specific leaf area (SLA), leaf dry matter content (LDMC), leaf nitrogen content (LNC), leaf phosphorus content LPC) and ratio of nitrogen to phosphorus (m (N): m (P), abbreviated as N / P). 【Result】 (1) In both natural forests and plantations, SLA and LDMC in different slopes of Pinus tabulaeformis were significantly different (P <0.05). SLA was higher in shady slope and LDMC in sunny slope. (2) There was a significant negative correlation between SLA and LDMC (P <0.01, of which leaf correlation coefficient r = -0.86 in the previous year and r = -0.84 in previous years). There was a significant negative correlation between LPC and m (N) (P <0.01, leaf r = -0.47, r = -0.70 in previous years); LNC was significantly and positively correlated with m (N): m Annual leaf P <0.01, r = 0.45). (3) In different developmental stages, the SLA of Pinus tabulaeformis was significantly higher than that of middle and large diameter (P <0.05). The trend of LDMC was opposite and the largest diameter of LDMC was the largest. (4) LNC and m (N): m (P) of leaves in all diameter grades were lower than those in previous years, but their LPCs were higher than those in previous years. 【Conclusion】 The slope aspect significantly affected the allocation of resources and energy of Pinus tabulaeformis leaves. The specific leaf area traits of shady-slope leaves were obvious, while the sunny-leaved leaves were mainly concerned with the accumulation of leaf dry matter content. The nutrient limitation types of Pinus tabulaeformis in Songshan area were nitrogen Restrictions, and new leaf growth is more limited by nitrogen. Leaf functional traits in different slopes and stages of development showed that Pinus tabulaeformis was adapted to countermeasures in order to minimize the adverse effects of the environment.