2008年雨雪冰冻灾害后,在崇义县选取了4块亚热带常绿阔叶林作为固定样地,分别记为P1,P2,P3和P4,连续5年监测了雨雪冰冻灾害对其植物多样性的影响。结果表明:雨雪冰冻灾害后的5年内,样地内的马尾松、拟赤杨和桤木消失了,增加了杜英;每块样地重要值排第一的树种在雨雪冰冻灾害后,其重要值都减小了,这些树种主要有槠树、栲树和木荷。雨雪冰冻灾害后,乔木层植物丰富度指数P1和P3样地增大,P4样地减小,P2样地变化较小;植物多样性指数P1样地增大,P2和P3样地变化较小,P4样地减小;植物均匀度指数P1样地增大,P2和P3样地基本未变,P4样地变化较小。林下植物种类数增加了黄瑞木、猕猴桃、白背叶等植物,而黄杨、野甘菊、苦竹等植物消失了,铁芒萁和茅草数量增加较多。从2011年开始,林内郁闭度恢复到了灾害前水平。
After freezing rain and snow disaster in 2008,four fixed sample plots (P1、P2、P3 and P4)were selected to measure the effects on the plant diversity of the subtropical evergreen broad-leaved forest in Chongyi County from 2008 to 2012.The result showed that Pinus massoniana,Alniphyllum fortunei and Alnus cremastogyne disappeared,and Elaeocarpus decipiens appeared.The important value of tree species which ranked the first before freezing rain and snow disaster was reduced.These tree species included Oachestnut,castanopsis fargesii,and Schima superba.The important value of Choerospondias axillaris increased within five years after the freezing rain and snow disaster.P1and P2 increased,P4 reduced,P3 changed little for the Margalef index of the arbor layer.P1 increased,P2 and P3 changed little,P4 reduced for the Shannon-wiener index of the arbor layer.P1 increased,P2 and P3 basically unchanged,P4 reduced for the Pielou index of the arbor layer.The species kinds and the species number increased or reduced under forest,and species increasing inluded Adinandra millettii,vine plants and Mallotusapelta Muell,and disappearing species included Buxus sinica,Dendranthema lavandulifolium,and Pleioblastus amarus.The quantity of Dicranopteris linearis and Cymbopogon citratus increased much.From the beginning of 2011,the canopy density of forest recovered to the level before freezing rain and snow disaster.
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