秦岭北坡板栗退耕次生林林分结构研究

Study on the Stand Structure Pattern of Chestnut Forest in North Slope of Qinling Mountains

采用大样地(1hm^2)法对陕西周至国家级自然保护区板栗经济林演替成的次生林林分结构进行了调查。结果表明该阔叶混交林,乔木层林分密度为213株·hm2,平均胸径24.6cm、树高12.88m,蓄积量103.11m^3·hm^(-2);林地共有植物56科91属101种,其中蔷薇科、山茱萸科、禾本科、菊科、豆科和伞形科的属数和种数较多;乔木层共有树种25个,板栗重要值依然最大,其次为锐齿栎;灌木、藤本植物有24种,隶属17科22属,忍冬重要值最大,是灌木层优势种,冰川茶藨子、山茱萸、山莓等重要值也较高;草本层植物49种,隶属24科45属,牛尾蒿重要值最大、为优势种,路边青、白透骨消、木贼麻黄等重要值也较高;该林地极有可能自然演替为锐齿栎林。

The stand inventory on the forest sample plots（1 hm2）in Shaanxi Zhouzhi National Nature Reserves was applied.The result showed that in mixed forest,the density of tree is 213 per hm2,mean DBH 24.6 cm,mean height 12.88 mand volume 103.11 m^3·hm2.There are 101 species belonging to 91 genera and 56 families,most of which are from Rosaceae,Cornaceae,Poaceae,Compositae,Leguminosae and Umbelliferae.In arbor layer,there are 25 species and chestnut is still dominant;in shrub layer,there are 24 species belonging to 22 genera and 17 families,out of which honeysuckle is dominant,followed by Ribesglaciale,dogwood and raspberry.In grass layer,there are 49 species belonging to 45 genera and 24 families,out of which Artemisia dubiais dominant,Geumaleppicum,Glechomabiondianaand Ephedra equisetina.The stand is potentially evolving toward Quercus acutissima.