The spatial distribution pattern of Megastigmus sabinae Xu et He larvae in Sabina przewalskii Kom forest
In order to accurately determine the population dynamics of Megastigmus sabinae Xu et He larvaes in mother trees of Sabina przewalskii forest in the Qilian Mountains.This study selected the mother trees of S.przewalskii forest in the eastern of Sidalong forest Pengou basin as the research object,carried on the M.sabinae larvae harm through setting sample plot and randomly selected sample in the testing ground,take the aggregation indices method and regression analysis method to analyzed its space distribution pattern,the result showed that:(1) M.sabinae larvae in the central Qilian cypress round crown amount of larvae is significantly higher than the upper and lower trees (the central Qilian cypress round crown amount of larvae was 52.15％ of the total amount of larvaes),in the canopy in different directions,the amount of larvae in the East,South,West,North on the proportion was 58.47％,64.66％,30.12％ and 27.48％ respectively.(2) M.sabinae larvae in mother trees of S.przewalskii forest are distributed are gathered,and the aggregation intensity increases with the increase of population density,the larva gathered together the reason is caused by the pest itself and the environment factors acted together.(3) In the regression test,with the La-m models of optimum fitting effect.
Sabina przewalskii KomMegastigmus sabinae Xu et Hespatial distribution patternaggregation indicesregression analysis
NETL
NSTL
万方数据
维普
