Abstract:Typhoons are one of the most important natural disturbances, which affect forest stand structures and dynamics in various ways such as by snapping branches, stripping leaves and fruits, uprooting trunks and breaking stem. Many factors, such as position in canopy, soil conditions, stage of growth, physiognomy, affect wind resistance of tree species. Moreover, there is a wind velocity beyond which all species are affected by the sheer magnitude of the wind's kinetic energy. Therefore, forest damage varies as a function of tree species, tree age, forest type, tree height and topographic location. High density forests often suffer great damage and mortality due to their relatively weak roots and a high ratio of tree height to diameter at breast height. In forest ecosystems, typhoon disturbance is one of the major agents generating a mosaic of heterogeneous habitat patches at various spatial scales. Canopy gaps caused by typhoon disturbance can occur in a variety of sizes, from single fallen trees to large-scale blowdowns, which is important factor affecting species composition and some critical ecosystem patterns and processes such as understory light environments, and nutrient cycling, and have major effects on patterns of forest regeneration through differential effects on tree species and impacts on resource availability. Light increases due to canopy gaps and soil nutrient availability in the understory also increases due to a decrease in uptake by disturbed canopy trees, which can promote the immigration of early successional species. Moreover, species richness is affected by coarse woody debris, litter layer, pits, and mounds, and the availability of propagules. Coarse woody debris and litterfall caused by typhoon promote return of forest carbon to soil, and affect distribution of soil nutrients. Typhoon disturbances can return large amounts of plant material into the forest floor. Litterfall, particularly green leaves resulting from the typhoons have higher nutrient concentrations than the normal litter for the nutrients that are translocated during senescence. This leads to an increase in nutrient availability and in soil after typhoons. The nutrient released from the rapid decomposition of fresh leaves might exceed the capacity of the vegetation, microorganisms, and the soil to retain the nutrients in the ecosystem, with nutrient transfer patterns of rapid loss for nutrients. Typhoon affects the animals by reducing food availability and deteriorating habitat, The passage of a typhoon can kill birds owing to exposure to wind and rain, particularly those vulnerable to wind and rain prior to the storm. Typhoon affects insect population numbers and causes local extinctions or dramatic outbreaks of populations through effects on either food sources and/or predators, it also damages forest place for pest propagation. Future research of typhoon effect on forests will focus on developing long-term monitoring of forests with typhoon interference, researching organic carbon storage of different forest soils, erosion patterns of soils and nutrients, intersection effect of typhoon and other natural disasters, improving mathematical models for forecasting typhoon damage.