东灵山主要树种在不同环境梯度下的叶功能性状研究
Leaf functional traits of main tree species at different environmental gradients in Dongling Mountain, Beijing.
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摘要: 以不同发育阶段的辽东栎和五角枫为对象,研究了其5 种叶功能性状在不同海拔和不同坡位上的变化。结 果表明:1)2 个树种的比叶面积和叶干物质含量在不同坡位上都表现出显著的差异,比叶面积为下坡位 上坡位, 叶干物质含量与之相反,且不同发育阶段的比叶面积和叶干物质含量随坡位变化的规律性相同,表明不同发育阶 段个体的比叶面积和叶干物质含量对坡位变化的响应相同。叶的氮、磷含量和氮磷比在不同坡位间没有显著差 异,表明坡位对叶的氮、磷元素影响不大。2)树种不同发育阶段的比叶面积、叶干物质含量、叶氮含量和叶磷含量 随着海拔梯度的变化都有显著差异,且变化规律不同;表明不同树种各发育阶段的叶功能性状对海拔梯度变化的 响应机制不同。氮磷比在不同海拔高度没有显著差异,可能是因为在较小的生境范围内,海拔对其影响较小。Abstract: The variations of leaf traits of Quercus liaotungensis and Acer mono at different life stages along altitude gradient conditions were studied to explore their resource utilization strategies. The specific leaf area (SLA), leaf dry matter content (LDMC), mass-based leaf nitrogen concentration (LNCmass), mass-based leaf phosphorus (LPCmass ) and ratio of nitrogen to phosphorus (N∶P ratio) were measured for adults, saplings and seedlings of Q. liaotungensis and A. mono on different slope positions along the altitude distribution gradient in Dongling Mountains, Beijing. The results showed that: 1) SLA of two tree species at different developmental stages had significant variations on different slope positions, which was larger at the bottom slope than that on the top slope, while LDMC showed an opposite trend, indicating that the changes of slope positions had same impact on leaf functional traits of species at different developmental stages. LNCmass, LPCmass and N∶P ratio showed no significant changes on different slope positions, suggesting that the slope position had little effect on LNCmass and LPCmass. 2) SLA, LDMC, LNCmass, LPCmass of species at varied developmental stages had a statistically significant difference along the altitude gradients, indicating that these leaf traits of two species at varied developmental stages had different response mechanism to altitude changes. The ratio of nitrogen to phosphorus had no significant differences along altitude changes, since in smaller habitat, altitude has little effect on the ratio.
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Keywords:
- altitude /
- slope position /
- developmental stage /
- leaf functional traits
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