A Study On The Estimation Of Forest Resources Loss

Forest is highly correlated with the development of social economy, civilization and the improvement of environment in Beijing. However, it takes on the character of frequent human disturbances and the induced natural calamities, bringing on great loss of the forest. The loss of trees is a widespread problem thereinto. Human induced loss once happens, e.g., stealing timbers, it will inevitably touch the interest among parties, and between the governments and the parties. According to , it is required to identify the loss of forest resources, before the conflict of interest could be solved in a law case. However, there is no a scientific, objective and systematic standard of assessment in the current execution of the laws, especially in dealing with the cases of economic compensations, which hinders the impartiality of execution of forest laws. Therefore, it is an impeding need to build a set of scientific system of qualitative standards of assessment to meet the demands of forest management and execution of forest laws in practice, especially the assessment of tree loss and its economic compensations. This study was focused on the quantification of tree loss in Beijing, our objective is trying to raise a quantifying method as well as the quantitative criterions to assess the loss of trees of different forest types, based on the theories of resource assessment, loss estimation and capital estimation in order to resolve the problems in theories, methods and applications of loss of forest resources.The major conclusions are summarized as follows:1. The conception and meaning of loss of forest resources was defined. And eight items of the assessment principles were created systematically.2. The types of forest resources and their loss in Beijing were classified; an assessment system of forest resource loss, including five groups and sixteen subgroups, was formed.3. Take an example of Beijing, the approbation degree of twelve functions of ten types of forest were calculated, and the dominant functions of each of the forest type were determined. The quantitative index systems, comprehensive- and sub-models of the tree loss of the ten types of forests were built.4. The factors which were hard to define and quantify in the indicator systems and sub-models were specialized.(1) Calculation of ecological values and weights of dominant ecological functions. Analytical Hierarchy Process was adopted to calculate the weights (wi) of the dominant functions of different forest types. The ecological value of an individual tree was calculated with a quantitative model...