斑块开度对树木结实和交配格局的影响:以城市油松(Pinus tabulaeformis)种群为例

Effects of patch openness on seeding and mating pattern of Pinus tabulaeformis

以城市种植油松斑块为例,探讨了斑块开度(作为林冠开度指标)对油松交配格局和结实的影响,发现斑块开度和油松自交率呈显著正相关,并与个体结实量具有一定的相关性.其原因可能是由于斑块开度增大导致自交种子败育率下降,或者是由于孤立木接收外源花粉相对较少.另外,本研究未发现斑块开度对花粉迁入有显著影响.

How forest tree species responds to habitat fragmentation has been a hot issue for a long time.Population size and population isolation are two major factors in such studies,other factors such as canopy openness earn little focus.Canopy openness can affect mating pattern of populations,respond to habitat fragmentation via pollen dispersion and seed production.In this study,we chose Chinese pine（Pinus tabulaeformis Carr.）patches as case model of habitat fragmentation,measured patch openness representing canopy openness,obtained data of seed production and mating pattern via counting and paternity analysis respectively.Correlation analysis indicated that patch openness was significantly correlated with selfing rate and marginally correlated with seed production.Patch openness might affect mating pattern and seed production by adjusting light conditions within patches.Although no obvious proofs have shown that patch openness influence pollen dispersal,our results indicated that population size and isolation change are not the only aspect of habitat fragmentation,but it should be a multidimension question.