小兴安岭主要树种单木叶面积指数季节变化

Seasonal Variation of Leaf Area Index in Xiaoxing'an Mountain

通过对榆树、白桦、毛赤杨、落叶松等单木树种生长期内的叶面积指数测量,分析其生长规律,运用Logistic生长模型拟合在生长期的叶面积指数,分析结果表明:落叶林各个回归模型的相关系数都达到了显著水平;各主要树种在生长季节叶面积指数呈逻辑斯蒂增长;不同树种,展叶盛期不同,基本上在7月初达到最大值;樟子松、红皮云杉、红松、冷杉常绿针叶单木在生长期内整体变化不大。

An experiment was conducted to measure the Leaf Area Index （LAI） of Elm, Betula platyphylla, Alnus sibirica and Larix gmelinii during the growth period for their growth rules. We used Logistic model to fit the leaf area index. The correlation coefficient of each regression model reaches the significant level. This method can provide the theoretical basis for digital simulation of the tree growth. The leaf area index of principal species during the growth season is increased in the form of Logistic. The different species have the different exhibition leaf stages and a maximum value occurs in early July. There is little change for Pinus sylvestrisvar mongolica, Picea koraiensis, Pinus koraiensis and Picea jezoensis evergreen coniferous forest in the overall growth oeriod.