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【目的】探讨红松天然林胸径生长的空间异质性及其与地形因子的关系,为科学管理经营红松天然林提供借鉴。【方法】通过采用地统计学、方差分析、地理加权回归等方法,对白河林业局的红松天然林胸径生长的空间异质性及其与海拔、坡位、坡向和坡度等地形因子的关系进行了研究。【结果】研究区内红松天然林胸径生长变异系数为0.6,属于中等变异性,其空间变异特征最适合用指数模型来描述,且模型拟合度高;红松天然林胸径生长在0~4 230 m范围内存在强烈的空间自相关;运用普通线性回归(OLS)与地理加权回归(GWR)方法建立基于地形因子的红松天然林胸径生长模型,预测结果显示,GWR方法较OLS方法提高了预测精度。【结论】红松天然林胸径生长在一定范围内具有较强空间异质性,且会因地形因子的变化而产生差异,其中海拔、坡向对胸径的生长影响较大。
【Objective】 The objective of this study was to investigate the spatial heterogeneity of DBH growth and the relationship with the topographic factors in natural Korean pine forests and provide references for the scientific management and management of natural Korean pine forests. 【Method】 Spatial heterogeneity of DBH growth of Pinus koraiensis natural forest in Baihe Forestry Bureau and its correlation with topographical factors such as elevation, slope position, aspect and slope were analyzed by means of geostatistics, analysis of variance and geographical weighted regression The relationship was studied. 【Result】 The results showed that the coefficient of variation of breast DBH of the natural Korean pine forest was 0.6, which belonged to the medium variant. The spatial variability of the natural Pinus koraiensis plantation was most suitable for the description by the exponential model and the model fitting degree was high. 4 230 m, there was a strong spatial autocorrelation. The DBH growth model based on terrain factors was established by using general linear regression (OLS) and geo-weighted regression (GWR). The results showed that the GWR method was better than the OLS method The prediction accuracy. 【Conclusion】 The DBH growth of natural Korean pine has a strong spatial heterogeneity within a certain range, and it will be different due to the change of topographical factors, of which the elevation and aspect have a significant impact on the growth of DBH.