黄花落叶松叶片生长性状

Leaf Growth Characteristics of Larix olgensis

以黄花落叶松(Larix olgensis Henry)天然次生林为研究对象,分析黄花落叶松1年生枝条叶片(leaveson annual branches,LAB)生长性状的分布规律。结果表明:黄花落叶松1年生枝条叶片的长度、宽度、单叶生物量及比叶面积对海拔的变化比较敏感,不同海拔高度的生长性状指标总体上差异显著(P<0.05)。龄级对黄花落叶松1年生枝条叶片的生长性状的影响不显著,但随着龄级的变小,叶片生物量有增大的趋势,表现为低龄级的黄花落叶松1年生枝条叶片的生物量增长较快。时间尺度上对黄花落叶松1年生枝条叶片的生长性状建模,结果表明1年生枝条叶片的生物量遵循logistic增长;叶片长度与叶片宽度遵循对数函数增长;比叶面积符合幂函数增长。时空因素对黄花落叶松LAB生长性状均具有一定影响,小尺度时空因素的变化也会影响到黄花落叶松1年生枝条叶片生长性状的变异。

A study was conducted to explore the leaf growth characteristics of annual branches of Larix olgensis Henry in a natural secondary forest in Tonghua City, Jilin Province. Results showed that the length, width, biomass per individual leaf and specific leaf area of the annual branches had significant difference between L. olgensis trees located at different altitudes （ P〈0.05 ）. An unobvious difference in growth characteristics of annual branches of different age classes was observed. However, the leaf biomass increased with age-class decreasing, indicating that the young trees had faster biomass gain than the elder ones. Time-seale models of leaf growth characteristics were built for the annual branches of L. olgensis. The leaf biomass followed the logistic growth curve, while logarithmic functions could be used to describe the growth of leaf length and leaf width, and the power function to describe the growth of specific leaf area. Results indicate that time and space factors all have certain effects on the growth characteristics of the annual branches of L. olgensis, and the change in space and time factors at a small scale can also cause the variation of the leaf growth characteristics.