Abstract:
Objective Taking the natural regeneration population of endangered plant Kmeria septentrionalis in karst habitat as object to study the population regeneration structure, spatial distribution pattern and environmental impact factors.
Method Point pattern and generalized mixed linear model were used to complete a linear fitting of the spatial distribution pattern and environmental impact factors of the regeneration population of K. septentrionalis.
Result (1) The population structure of K. septentrionalis was in an inverted “J” type, the survival curve was close to Deevey-Ⅲ; the existence of a large number of young-aged seedlings indicated that the regeneration condition of K. septentrionalis population was good. (2) Except for the weak random distribution on a small scale, the other scales were in a clustered distribution. (3) The canopy density, soil moisture and rock exposure rate were the main factors affecting the spatial distribution of K. septentrionalis.
Conclusion The condition of the regeneration population of K. septentrionalis in the study area is good, and the high-intensity spatial aggregation distribution is mainly the combined action of the seed biological characteristics and karst habitat.
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