Amount and Seasonal Dynamics of Litterfall in Four Vegetation Types in Jigong Mountain Nature Reserve

To explore the litterfall and seasonal dynamics of forest ecosystem in main vegetation types, by the method of litterfall trap, amount and composition of litterfall in four vegetation types in Jigong Mountain Nature Reserve were surveyed from April 2013 to March 2014.The results showed annual litterfall amount rank was deciduous broad-leaved forest(8.43 t/hm2)> needle and broad-leaved mixed forest(8.15 t/hm2)> Pinus massoniana forest(7.73 t/hm2)> Cunninghamia lanceolata forest(7.19 t/hm2).Leaf litter is the main litterfall which account for 50%-71% of total production,then are branch litter, fruit litter and flower litter, respectively. The monthly dynamics of litterfall showed a double peaks, with the first appeared in July and the maximum in December; the monthly dynamics of plant components were obvious different, leaf fall peak appear in December that account for about 40% of annual leaf litter amount, branch litter mainly from July to October, flower litter mainly in April that account for 60% of annual amount, fruit litter mainly in October; however;the Cunninghamia lanceolata forest reach the peak in February of second year.The litter amount and dynamics of different vegetation types reflect the biological characteristics and adaptability to drought stress of plant in some extent.