Interrelationships among crown diameter, diameter at breast height and stump diameter of Silver fir trees

摘要

The paper describes the statistical procedure in a case study of Silver fir (Abies pindrow Spach.) forests of Western Himalayas in India to assess the breast height diameter and crown diameter of trees from stump diameter with the help of regressionand correlation analysis. A series of regression equations have been developed using the stump diameter (DSH) as independent variable while crown diameter (CD) and breast height diameter (DBH) as dependent variables. With the incorporation of DSH in theequation, the DBH and CD of the felled and removed trees can be accurately predicted. The method is simple and easily applicable. The results will provide clues to detect the undersize recordings and excessive felling of trees. For each diameter class the crown area, number of trees per ha and the number of trees per ha after thinning can be calculated and a table constructed. This will provide an aid in thinning of even-aged crop and thinning can be done for any stage of the crop quantitatively, usingthis table.