Population structures and dynamics ofAbies nephrolepis in the Changbai Mountains
The study in the Changbai Mountain area in Jingouling forest farm inspection method 1 District in different canopy density (0.5-1) update sample based on, the population life table, survival analysis, spectral analysis and spatial distribution pattern analysis method, studied populations ofAbies nephrolepis under different canopy conditions in the overall structure and characteristics, to reveal the number and spatial distribution rule of dynamic changes. The results showed that: (1) the mortality curve ofAbies nephrolepis populations and the disappearance rate curve has a similar variation, there are a total of 3 mortality peak, low density level (0.5-0.6) death peak appeared in ifrst and eighth age grade, middle grade canopy (0.7-0.8) 4 and 9 in diameter ifrst, high grade, canopy density (0.9-1) in ifrst, 2 and 10 diameters; survival curve close to Deevey- type II, belong to stable population; when the increase ofAbies nephrolepis age class, the survival rate curve decreases continuously, the cumulative mortality curve continued to increase; spectrum analysis results show that, the fluctuations in the eighth and the ninth age class,Abies nephrolepis population fluctuation is big cycle of a small cycle multi-harmonic superposition. (2) Populations ofAbies nephrolepis under three different canopy closure conditions on the whole performance was cluster distribution. In generally, the distribution of different growth stages, the stage of seedlings (H is more than or equal to 30 cm DBH< 1 cm) and young (less than or equal to 1 cm DBH< 5 cm) is a cluster distribution, tree (5 cm< DBH<25 cm) stage to random distribution, in the stage of trees (DBH greater than or equal to 25 cm) showing uniform distribution state. This result matches the conclusion of age structure and number of dynamic conclusions.
NETL
NSTL
万方数据
维普
