阔叶红松林主要树种生长的水热指数和最优生长过程的模拟研究

MOISTURE-THERM INDICES AND OPTIMUM-GROWTH MODELING FOR THE MAIN SPECIES OF KOREAN PINE/DECIDUOUS MIXED FORESTS

以阔叶红松林8个主要组成树种为研究对象,根据水分和热量是决定植物地理分布的主要因素的原理,应用干燥度和≥10℃的年积温建立了树木生长水热指数;设在最佳环境条件下树木的生长与叶量成正比,与本身大小成反比,推导出树木最优生长模型。然后,应用该水热指数和生长模型模拟了不同水热条件下树木的最优生长过程,揭示了不同树种、或同一树种在不同水热条件下的生长特征。这些研究结果可用于划分树种地理分布区质量等级和评价林分的生长。

According to the principle that contents of water and heat are the two main factors for determining the geographical distributions of tree species, moisture-therm indices have been developed with drougt index and growing degree days, for the 8 species (Pinus koraiensis, Fraxinus mandshurica, Tilia amurensis, Qurcus mongolica, Acer mono, Ulmus japonica, Betula platyphylla, and Populus davidiana) in the Korean pine/deciduous mixed forests. By assuming that tree growth under optimum conditions is proportional to its leaf biomass and is inversely proportional to its size, the optimum growth model has been derived for the 8 species. With combination of the index and growth model,the optimum growth processes of trees grown under different conditions of moisture and heat has been simulated, and the growth features of different species and the same species under different moisture and heat conditions have been revealed. These results can be used for classifing quality of geographical distributions of tree species and evaluating a stand growth.