环境因素对油松林木材生产影响的定量评价

本文使用多元统计分析方法, 定量评价了环境因素对陕西省油松人工林木材生产的影响程度。在地理-地形-土壤环境因素组中, 土壤类型对油松林的生长影响最大, 占38.75%。在气候因素组中, 7月平均气温对陕南及秦岭一带油松林的生长影响最大, 占34.46%。在陕北地区, 对油松林生长影响最大的因素是年降雨量, 占27.8%。不同气候因素作用于不同地区森林的程度有较大差异。根据综合环境因素对油松林木材生产的影响及林分生长表现, 在陕西省划分了3个油松生长区:(1)陕南及秦岭油松生长区;(2)关中及陕北南部生长区;(3)陕北北部生长区。并对各区的特点进行了总结。

Quantitative evaluation on the influence of environmental factors on timber production of Pinus tabulaeformis

Using the method of multivariate statistical analysis, this paper quantitatively evaluates the influence of environmental factors on the timber production of artificial Pinus tabu laeformis forests in Shanxi province. In the group of geographic-topographic-edaphic fac tors, soil type is the prime important factors in affecting the growth of Pinus tabulaefor mis, its contribution amounts to 38.75%. In the group of climatic factors, mean tem perature in July is most important in South Shanxi and Qinling Mountains, it contributes 34.46%; and in North Shanxi, the prime important factor is annual precipitation, whose contribution amounts to 27.80%. Based on the effect of environmental factors and the performance of stands, three growing zones of Pinus tabulaeformis in Shanxi province are devided,and each zone is characterized by environmental factors and growing performan ces.