福建武平帽布米槠林火烧后植物种类变化的研究

福建武平帽布天然米槠林皆伐火烧后重要值和物种多样性变化规律研究。结果表明：火烧后幼树层重要值最大者为阳性树种（山乌桕Ｓａｐｉｕｍ ｄｉｓｃｏｌｏｒ）、灌林层重要值最大者为阳性树种（茶秆竹属一种Ｐｓｅｕｄｏｓａｓａ ｓｐ．），而火烧前幼树层重要值最大者（米槠Ｃａｓｔａｎｏｐｓｉｓ ｃａｒｌｅｓｉｉ）变为第二位、灌木层重要值最大者（赤楠Ｓｙｚｙｇｉｕｍ ｂｕｘｉｆｏｌｉｕｍ）也变为第二位；其它层次火烧

Diversity Changes ofNatural Castanopsis carlesiiCommunity after Clearcut and Then Burned

The importancevalue and diversity index of natural Castanopsis carlesii community were measured afterclearcut and bruned in Maobu Forest Farm,Wuping county,Fujian province.The results showedthat the highest importance value in young layer after burned is sunpreferred plant(Sapiumdiscolor)and in shrub layer is Pseudosasa species,Castanopsis carlesii in young layer andSyzygium buxifolia in shrub layer with the highest importance value before burned becomethe second.The highest importance value of Gahnia tristis in herb layer and Millettiadielsiana in lina layer before burned are similar to that after burned.After burned,thediversity index of each layer increase due to the invasion of some sunpreferredplants,furthermore,the number of individuals and species evenness also increase withspecies dominance decrease.