I-72杨树冠特性与生物量相关性研究

分析安徽省安庆市长江外滩地18年生I-72杨树冠特性与生物量的相关性。结果表明,冠幅与生物量呈一元线性相关;冠长与生物量为指数相关;冠形率与生物量也呈指数相关,但相关系数较低;冠幅垂直投影面积与单株生物量呈对数相关;叶干重、单株叶面积与单株生物量为一元线性相关。受造林密度、林分立地条件的影响,树冠特性因子与生物量的相关模型在两种密度的林分中基本相同,但其响应系数略有不同。在树冠特性指标中,叶面积、叶干重与生物量的回归模型能较好地反映二者的变化关系。

Correlations between crown characteristics and biomass of popular I-72

The correlations between crown characteristics and biomass of popular I-72 were studied in reaches of Yangtz River in Anqing,Anhui Province.The results were as follows:The relationship of average crown diameter and biomass of single tree was linear correlation;The relationship of biomass of single tree and crown tall accorded with the model of exponential correlation;The relationship of biomass of single tree and crown form ratio accorded with the model of exponential correlation,and coefficient of correlation was very small;The relationship of biomass of single tree and vertical projective cover for crown diameter adapted to logarithm correlation;The relationships of leaf dry weight and leaf area of single tree and biomass were linear correlation.Affected by forest density and site condition,though the model of the characteristics and biomass in two systems of forest density were the same,but the correlation coefficients were different.Among indexes of crown characteristics,leaf area and leaf dry weight were closely related with biomass of single tree.