| 269 sample trees were selected from Pinus densata natural forest in five counties (districts and cities) of Deqen Prefecture and Lijiang City, Yunnan Province, to analyzed the relationship between standing tree volume and DBH, tree height, crown width and crown length, and construct the standing tree volume model based on DBH, tree height and crown factors. The traditional unitary and binary models were introduced to compare, the fitting effect was analyzed, and the independence model was tested respectively. The results showed that the correlation between tree volume and DBH was the highest, followed by tree height; in the crown factor, the correlation between tree volume and crown width was higher than that of crown length. The fitting effect of tree height in the unitary model was the best, R2 was 0.803 254; the fitting effect of tree height and crown width in the binary model was the best, R2 was 0.874 176; the fitting effect of tree height, crown length and crown width in the ternary model was the best, R2 was 0.880 104. This paper also discussed the application scope of Lidar technology, tree damage and accuracy improvement. |
