Ledum Palustre Larch In Daxinganling Forest Health Monitoring And Evaluation

Forest is the largest terrestrial ecosystems of natural eco-systems, and provides human services. But because of the unreasonable use,forest ecosystem degradation occurred. Forest district of Da xinan Mountains is one of the larger State-owned forest region in China and it is an important production base of wood. Larix gmelini is the main constructive species in this area. For a long time, because of natural fators and human being activity, this forest ecosystem appeared degradation. Larix gmelini is main specics in Da xinan Mountains. Its area is more than80%. this paper took Larix gmelini as research object, analyzed different stage of growth. Through field investigation,establish health assessment index system, comprehensive evaluation on forest health, got some results:1. the main factors affecting Larix gmelini are7parts:plant diseases and insect pests, injurious beast of forest; forest fire, biological diversity, soil condition, Pollution status, man-made interference.2.According to the health status of evaluation index system and Stefan Dusan of larch stands, Determine the method for calculating indicators, evaluation criteria and classification of health:the value is from8to10is health,6to8is subhealth,4to6is normal healthy,0to4is unhealthy.3.The results:the value of young forest, mature forest, near ripe forest are7.2837、8.1632、7.5984. the result shows that:mature forest is healthy, young and ripe forest is subhealth. The total forest’value is7.8473,it is subhealth.4.The key factors affecting forest are:soil condition, man-made interference, biological diversity.