Composition and Seasonal Dynamics of Litter Falls of Major Forest Stands in Qinhuangdao Seaside Forest Farm

[Objective] The aim of the study was to understand the amount and rhythm of litter falls in three major forest stands in Qinhuangdao seaside forest farm.[Method] At the end of each month,the litter falls were collected and dry masses were weighed,it was to obtain the amount and rhythm of litter falls in three major forest stands.[Result] The annual litter production was in the sequence of R.pseudoacacia(3.411 t/hm2),P.canadensis(2.680 t/hm2),P.thunbergii(1.823 t/hm2);The litter production of leaves of three forests(R.pseudoacacia;P.canadensis;P.thunbergii)occupied a higher percentage in the annual total litter production than that of other components,leaf litter production accounted for 72.97%,77.43%,83.21% of the total amount of litter respectively.The litter falls showed evident seasonal dynamics,pattern of monthly variation of the annual littermass followed unimodal in the three forests,leaf-litter peaked in October,twig-litter peaked in winter and spring;Flower-litter from R.pseudoacacia peaked in April to May,while fruit-litter peaked in September;Flower-litter from P.canadensis peaked in March to April,while fruit-litter peaked in May.[Conclusion]The study provided basis for reasonable business of plantation and reasonable allocation of tree.