摘要
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。
The data obtained from 41 survey plots within the range of Shanxi preovince, e. g. growth increment, characters of cone, needle and seed, were analyzed in the aspects of single correlation and multiple regression analysis. The results indicated that the differences in 9 characters among stands were significant at the 0.01 level, some characters correlated with longitude and latitude, climatic factors. The general tendency was that the needle numbers of a cluster increased as the climate become drier and colder from south to north, which was on the variation pattern of cline, and the cone-scale numbers also increased gradually, There was also a tendency to increase annual increment from northeast to southwest, especially there was a strong positive correlation between diameter increment and altitude. In addition, the multiple regression analysis results showed latitude, annual mean temperature, and mean temperature in Junuary were the main factors affecting increment, while mean temperature in July and latitude influence the change in needle numbers of a cluster mainly. In the meantime, the main ecological factors which influence variation have been screened out
出处
《林业科学》
EI
CAS
CSCD
北大核心
1992年第6期493-501,共9页
Scientia Silvae Sinicae
关键词
华北落叶松
地理分布
种群变异
Shanxiv Larix pricipis-rupprechtii Mayr
Geographic distribution
Population variation
Cline
Regression analysis
