Impact Of Different Restoration Approaches On Structure And Productivity Of Forest-swamp Communities In Daxing'an Mountain And Xiaoxing'an Mountain

The structure, biomass, growth process and productivity of natural, succession or planted forest-swamp communities were studied by using transect investigation method and the sample tree analysismethod, along the environmental gradients from swamp to forest in Daxing'an Mountain and Xiaoxing'anMountain, in order to assess the effects of the restoration approaches on structure and productivity offorested wetlands, and probe valid restoration approach, and provide scientific basis for managingdeteriorate forested wetlands. The results showed that:â‘ the constructive species of succession or naturalforest-swamp communities were replaced regularly along the environmental gradients from swamp toforest, which apears in turns as Alnus sibirica,Betula platyphylla, Larix gmelini, but this did not take placein planted communities,there is only one species of Lgmelinii.â‘¡the diameter class distribution ofsuccession or natural forest-swamp community was absolutely dominated by smaller diameter classes, butit was dominated by smaller diameter classes in low areas and bigger diameter classes in middle and highareas of planted communities.â‘¢Growth process (annual DBH growth, annual high growth, annual volumegrowth) of constructive species in different forest-swamp communities changes along the environmentalgradients,decrease in natrnal forest-swamp and natural succession forest-swamp after fire,increase in plantedforest-swamp, decrease first and increase later in natural succession after cutting.â‘£productivity (meanannual volume) changes greatly along the environmental gradients from swamp to forest, in Daxing'anMountain, natural or succession forest-swamp communities (6.006～1.316m³Â·hm(-2)·a^-1 or 6.690～2.137m³Â·hm^-2·a^-1) decreased progressively, but planted communities (4.350～6.991m³Â·hm^-2·a^-1) increasedprogressively;In Xiaoxing'an Mountain, natural forest-swamp communities(3.565～3.661 m³Â·hm^-2·a^-1) keepconstant, succession forest-swamp communities (0.411～1.524 m³Â·hm^-2·a^-1) decreased progressively, plantedcommunities (3.355-10.819 m³Â·hm^-2·a^-1) increase progressively⑤productivity (mean annual biomass)changes greatly along the environmental gradients from swamp to forest, in Daxing'an Mountain, naturalor succession forest-swamp communities (3.357～0.793 t·hm^-2·a^-1 or 4.537～1.130 t·hm^-2·a^-1) decreasedprogressively, but planted communities (1.988～3.340 t·hm^-2·a^-1) increased progressively;In Xiaoxing'anMountain, natural forest-swamp communities(3.161～3.527 t·hm^-2·a^-1) keep constant, succession forest-swamp communities (0.296～1.325 t·hm^-2·a^-1) decreased first and increase later, planted communities(2.927～7.0946 t·hm^-2·a^-1) increase progressively.