Development and application of forest ecosystem health theory in forest ecological construction of China.

The development courses of forest ecosystem health theory were reviewed,and the connotations,restoration,and reconstruction were discussed systematically.Based on the summary of the practice of alien forest health,some main factors which have effects on forest health have been pointed out,for example human activities,simplification of habitat and fragmentation of forest system,management modes of forest,natural disturbance,invasion of exotic species,environment pollution,and forest biological disaster and so on.The main problems existing in forest health of our country were analyzed in detail.According to the structure, function,current situation,and health status of our country forest ecosystem and the micro-strategy goal of forest ecological construction,more pertinence research activities should be carried out for such a forest health link as follows: construction and reconstruction,transformation and restoration,production management and utilization,and prevention forest pests.In the meantime,sustainable controlling forest pests,improving immunity capacity of forest ecosystem,preventing air pollution and forest fire,and decreasing forest biological disaster due to environment factors should be implemented.