Zeng W.-S.,Academy of Forest Inventory and Planning |
Song L.-C.,Second Institute of Forest Monitoring and Planning of Inner Mongolia |
Zhao X.-J.,Forest Monitoring and Planning Institute of Inner Mongolia |
Wang X.-J.,Academy of Forest Inventory and Planning |
Xing L.-J.,Forest Monitoring and Planning Institute of Inner Mongolia
Forest Research | Year: 2015
Objective: Aiming at the incompatibility of shrub biomass models between total biomass and components, or above- and below-ground biomass, the authors attempted to develop compatible shrub biomass models using the approach of simultaneous equations. Method: Based on the individual biomass mensuration data of two common shrub species, Caragana korshinskii and Armeniaca sibirica, in the Inner Mongolia in China, the approach of nonlinear error-in-variable simultaneous equations was used to establish compatible above- and below-ground biomass models and root-to-shoot ratio model. Result: The results are as follows: 1.The determination coefficients of above-ground biomass models based on canopy area and amount of stem (or mean height of stem) were higher than 0.67, but those of below-ground biomass models were relatively lower, and that for A. sibirica was only 0.36. 2.The mean prediction precisions of above- and below-ground biomass models for the two species were above 80%, and that of whole biomass model for A. sibirica was above 86% while that for C. korshinskii was above 92%. Conclusion: It could be concluded that for tufty shrub species without obvious trunk, the canopy area was the most important factor related to shrub biomass, whether above- or below-ground biomass modeling, and the next was the amount or mean height of stems; the effective approach to solve the problem of incompatibility among different biomass was using nonlinear error-in-variable simultaneous equations to develop compatible above- and below-ground biomass models and root-to-shoot ratio model; and the biomass models developed here could be applied in shrub biomass estimation for the two species in the Inner Mongolia. ©, 2015, Chinese Academy of Forestry. All right reserved.