樟子松人工林树冠结构的分形分析

基于樟子松人工林7块固定标准地中的31株解析木的树冠体积和叶量,以幂函数关系(F=Av^(D/3))建立了预估树冠表面积的分形维数。同时根据生物量实测数据,建立预估叶量的生物模型Lw=0.180397D^3045903H^-1.67348。基于枝解析、树干解析数据,动态地预估了一年、二年、三年前的树冠体积,并结合树冠体积、叶量的这种幂函数关系可以动态地预估一年、二年、三年前树冠表面积的分形维数,从而反映出树冠结构的动态变化规律。为了了解不同分级样木的分维数变化情况,利用2003年调查的4块生物量标准地数据,根据单株树木各个枝条占据的空间体积与该枝条的带叶枝干重的关系,计算了各标准地不同分级样木树冠的分维数。为探讨单株样木树冠的分维数的计算提供了一种可行方法。树冠的分维数作为表征树冠的动态生长变化是一有用和可靠的指标。

Fractal analysis of crown structure in Pinus sylvestris mongolica plantaiton

Fractal dimensions of crown surface area is developed by regression using data based on crown volume and foliage mass from 31 analysis trees of 7 permanent sample plots. Meanwhile biology model Lw = 0. 180 397D^3.045903H^- 1.67348 is established to estimate foliage mass according to actual measurement. Combining data from branch analysis and stem analysis, we can dynamicly estimate crown volume one year, two year, three year ago. And furthermore the relations with power functions between crown volume and foliage mass may dynamicly estimate fractal dimensions of crown surface area one year, two year, three year ago. Therefore reflect tree crown construction variable dynamic regulation . For grasping tree crown fractal dinlension of the different classifications, we calculated tree crown fractal dimension of the different classifications, utilizing volume occupied by each branch and dry foliage mass of branch from four samples plots in 2003. a new practical method for estimating ffactal dimension of a single crown is developed. Tree crown fractal dimension is a useful and practical indite to symbolize tree crown dynamic growth variety.