Study On Health Assessment Of Coniferous Broad-leaved Mixed Forest In Middle Region Of Daxing’an Mountains

In xingan league is an important ecological defense line in northeast China. But the long-term high strength cutting use, resulting in timber resources, community hierarchy single wait for a phenomenon. The 1999 national natural forest protection project, after 20 years of constantly, governance and protection of local forest region has improved, but there are different degrees of deterioration. Therefore, this research in xingan league WuChaGou forest farm set up 8.8 hm2 evaluate the forest health monitoring details, to the middle part in daxing’an mountains forest area will provide a scientific basis for rational management. The specific content and the evaluation results are as follows:1. Through field investigation, the selection of evaluation and determination, and build coniferous broad-leaved mixed forest in middle region of daxing’an mountains evaluation index system, including productivity, organizational structure, resistance and soil nutrient, a total of 17 indexes from four aspects.2. The use of Delphi, AHP method to determine index weight, and health index was obtained by comprehensive index model, the details to health is divided into five levels, respectively, for good health, good health, health, sub-health and unhealthy. The results for the study area 218 standards, in the number of the standard of health for 32,14.68% of the total, in the health standard for 170, accounting for 77.98% of the total,16 are in good health,7.34% of the total, in excellent health and unhealthy to 0. Overall, the coniferous broad-leaved mixed forest in middle region of daxing’an mountains is in healthy condition, the average health index was 0.621.3. Each evaluation index and the health index correlation analysis, the results show that the volume per unit area, hierarchy structure, bringing diversity index and forest types as the main factors that affect forest health.