| Title | Spatial yield model for Shorea robusta in Nepal |
| Publication Type | Journal Article |
| Year of Publication | 1999 |
| Authors | Rautiainen, O, |
| Journal | Forest Ecology and Management |
| Volume | 119 |
| Issue | 1/3 |
| Pagination | 151-162 |
| ISBN Number | 0378-1127 |
| Keywords | Dipterocarpaceae, Distance-dependent growth model, Even-aged forest, forest management, Sal, Shorea robusta, spatial yield model, thinning |
| Abstract | <p>A spatial yield model is presented for even-aged Shorea robusta stands in southern Nepal. The model consists of a single-tree, distance-dependent diameter-growth model, a single- tree, distance-independent height model, and a distance- independent mortality model. The data for the model were collected from 29 S. robusta plots of varying density, tree spatial pattern, and stand age. The diameter-growth model is based on measurements made from 580 trees, while 1336 trees were measured to provide data for the height model. The competition situation of individual trees was described by means of a competition index depending on the vertical angle sum defined by a horizontal plane placed at the top of the subject tree, and by the heights and distances to competitors. The predictors in the diameter-growth model were: diameter at breast height, tree height, past growth (diameter/age), stand basal area, and competition index; tree height and past growth rate had positive coefficients. The model explained 53% of the variation in diameter growth. Simulations were carried out to examine the yield and stand development under selected management (thinning) regimes.</p> |
| URL | http://dx.doi.org/10.1016/S0378-1127(98)00519-2 |
