1.Key Laboratory of Forest Plant Ecology of Ministry of Education,Northeast Forestry University;2.Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences;3.Resource Management Bureau,Daxing’anling Administration Office;4.Northeast Forestry University
Biodiversity conservation including plant species in natural forests is very important for their ecological service function, and decoupling the association among individual features, plant community characteristics and species diversity will help to upgrade the structural-oriented solution for well protection of local plant species. Based on this, by using Dobukur National Reserve at Daxinganling Mts., we investigated total 42 plots(30m*30m) for trees, 210 plots for shrub and regeneration layers(2m*2m) and 210 plots for herb layer (1m*1m), and detailed recorded the individual size (tree height, diameter at breast height, basal diameter, branch height, shrub height, herb height, etc) and their community traits (arbor, shrub, herb and regenerated seedling density and coverage), and all species names (genus and family) for the calculation of plant diversity indices. All these data were used for frequency distribution, redundancy ordination and variation partitioning for finding their basic features of the forests and decoupling their associations. The results showed that:(1) Larix gmelinii is the main tree species in Dobukur, with a relative abundance of 42%, followed by Betula platyphylla and Betula nigra. The proportion of hazelnut (Corylus heterophylla) is the highest among shrubs, reaching 60%. A total of 116 species of herb layers were found, of which Carex callitrichos accounted for the largest proportion, exceeding 10%. The main tree species in the regeneration layer is Quercus mongolica (54%), followed by Betula platyphylla. (2)The richness index and diversity index were in an order of herb layer >arbor layer > shrub layer> regeneration layer, while their evenness was peaked in shrub layer.(3)The average tree height of the arbor layer was 13.2m, the average diameter at breast height was 14.3cm, the average branch height was 7.5m, the average canopy density was 0.73(73% of the overhead sky was occupied by canopy), and the average tree density was 1500 trees/ha. Shrub height averaged at 1.1 m, ground diameter averaged at 1.1 cm, the shrub coverage averaged at 23.2%, and shrub density averaged at 1.3 plants/m2.The average height of herb layer was 37.6 cm and their coverage was 54.4%.The average height of regeneration trees was 1.83 m, the average ground diameter was 1.20 cm, and the average seedling density was 0.17 plants/m2.(4)Redundancy analysis and variation partitioning showed that the individual size (rather than community features), and arbor layer characteristics(rather than shrub and herb layer) contributed the most to the plant diversity variation observed in this study. Of all the tested parameters, Tree height and seedling density in regeneration layer gave the most significant explaining power for the plant diversity variations. The forests in Daxing"anling Mts have been fully included in the Natural Forest Protection Program (NFPP，completely inhibit timber harvest since 1999). The above-mentioned data from National Nature Reserve, as a local background data, clearly showed that the forests in this region are still in their young stage and long-term protection are necessary. These data will provide supports for further National Reserve-policy decision and implementation of NFPP in NE China.
张喜亭,张建宇,肖路,陈胜仙,仲召亮,高薇,王文杰.大兴安岭多布库尔保护区乔、灌、草及更新层植物多样性、群落结构特征及其耦合关系研究.生态学报,,(). http://dx. doi. org/10.5846/stxb201812212775复制