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对山西省内华北落叶松天然林调查,得到了41个调查点的生长量、球果、针叶和种子等性状的材料,并对这些数据进行了单相关分析和多元回归分析。结果表明:9个性状林分间的差异达到极显著水平,有的性状与经纬度、气候因子呈显著的相关。总的趋势是:随着气候干旱、寒冷、每簇针叶数目越来越多,呈单向渐变群的变异模式,且果鳞数目逐渐增多;年生长量也呈现由东北向西南逐渐增加之趋势,尤其是胸径生长量与海拔呈显著的正相关。多元回归分析表明:纬度、年均温,1月均温是影响生长量的主要因子:而影响每簇针叶数目变化的主要是7月均温和纬度。同时还筛选出影响变异的主导生态因子。
Based on the investigation of natural Larix principis-rupprechtii in Shanxi Province, we obtained the materials of growth traits, cones, needles and seeds from 41 survey sites. The data were analyzed by single-correlation analysis and multiple regression analysis. The results showed that the differences among the nine traits were extremely significant, and some traits were significantly correlated with latitude and longitude and climatic factors. The general trend is as follows: As the climate is arid and cold, the number of conifers per cluster is more and more increasing, showing a one-way mutation group variation pattern, and the number of fruit scales gradually increases; the annual growth also shows a gradual increase from northeast to southwest The trend, especially DBH, was significantly positively correlated with altitude. Multiple regression analysis showed that latitude, annual average temperature and average temperature in January were the main factors affecting the growth. The main influencing factors on the change of the number of conifers per cluster were the average July latitude. At the same time, we also screened the dominant ecological factors that affect the variation.