The Health Assessment Of White Birch Forest In Daqing Mountain Of Inner Mongolia

The research papers is based on the preliminary investigation of forest resources in Daqing mountain of Inner Mongolia. Select four typical forest area as the original data collection. Under the guidance of the principle for scientific, feasible, representative and the dominant element. Combined with second-class investigation of forest resource information in Daqing mountain of Inner Mongolia. Establish the health evaluation index system of white birch forest based on tree height, DBH, volume per unit area, crown density, shrubs coverage, herb coverage, humus thickness and soil thickness. Using analytic hierarchy process to determine the index weight. Using normal distribution theory and the theory of standard deviation give hierarchies of standard for different age class of white birch forest with the typical sample health evaluation indexes and comprehensive index of forest health. Then, give the health assessment with the standard of white birch forest. The result:(1) The evaluation of different forest white birch forest in Daqing mountain of Inner Mongolia, 4863.1 hm2 white birch forest in manhanshan, the proportion ofâ… health level is 6.6%, the proportion ofâ…¡health level is 88.9%, the proportion ofâ…¢health level is 4.5%; 6401.5 hm2 white birch forest in guluban, the proportion ofâ… health level is 10.7%, the proportion ofâ…¡health level is 77.7%, the proportion ofâ…¢health level is 11.6%; 5848.5 hm2 white birch forest in jingergou, the proportion ofâ… health level is 6.9%, the proportion ofâ…¡health level is 87.2%, the proportion ofâ…¢health level is 5.9%; 2437.7 hm2 white birch forest in hadamen, the proportion ofâ… health level is 14.8%, the proportion ofâ…¡health level is 73.1%, the proportion ofâ…¢health level is 12.1%.(2) The evaluation of different age group white birch forest in Daqing mountain of Inner Mongolia, the area of the young white birch forest is 3396.2hm2, the proportion ofâ… health level is 9.2%, the proportion ofâ…¡health level is 83.7%, the proportion ofâ…¢health level is 7.1%; the area of the middle-aged white birch forest is 14303.1hm2, the proportion ofâ… health level is 8.1%, the proportion ofâ…¡health level is 84.6%, the proportion ofâ…¢health level is 7.1%; the area of the mature white birch forest is 1851.5hm2, the proportion ofâ… health level is 15.8%, the proportion ofâ…¡health level is 67.3%, the proportion ofâ…¢health level is 16.9%. (3) From white birch forest in Daqing mountain of Inner Mongolia. The quantity ofâ…¢health level classes for white birch forest is at least, has 317 block, take total number of 8.4%, area for 1601.8hm2, take total area of 8.2%; The quantity ofâ…¡health level classes for white birch forest has 3101 block, take total number of 82.2%, area for 16184.3hm2 , take total area of 82.8%; The quantity ofâ… health level classes for white birch forest has 355 block, take total number of 9.4%, area for 1764.7hm2 , take total area of 9.0%.