湘西土家族苗族自治州公益林维管束植物调查

Investigation of vascular plants of public welfare forests in Xiangxi Tujia and Miao Autonomous Prefecture

在湘西土家族苗族自治州省级及以上公益林面上按机械布点原理,设置68个样地为研究对象,通过实地调查样地环境、生态因子和样地维管束植物信息,分析样地物种组成、不同生活型植物的相对多度、相对优势度、相对频度以及重要值以研究湘西土家族苗族自治州生态公益林维管束植物多样性。结果表明:通过调查共记录维管束植物431种,隶属109科283属,其中被子植物390种,裸子植物5种,蕨类植物36种。优势科为蔷薇科(Rosaceae)、菊科(Compositae)和樟科(Lauraceae),科属的多样性分化明显,草本159种,灌木152种,乔木120种。通过计算重要值,杉木、马尾松为乔木的优势种,灌木和草本重要值分布较为均匀。乔木、灌木和草本三种生活型植物重要值分布规律均为在群落中重要值高的物种数少,重要值较低物种数较多。

Sixty-eight sample plots were set up on the public welfare forests at the provincial level and above in Xiangxi Tujia and Miao Autonomous Prefecture,according to the principle of mechanical distribution.Through field investigation of environment,ecological factors,and vascular plant information,the species composition,relative abundance,relative superiority,relative frequency,and important value of different life-form plants were analyzed to study the vascular plant diversity in public welfare forest in Xiangxi Tujia and Miao Autonomous Prefecture.The results indicated that a total of 431 species were found,belonging to 109 families and 283 genera,including 390 species of angiosperms,5 species of gymnosperms,and 36 species of ferns.The dominant families are Rosaceae,Compositae and Lauraceae,while their diversity of family and genera is clearly differentiated.There are 159 species of herbs,152 species of shrubs,and 120 species of trees.By calculating the importance value,Cunninghamia lanceolata and Pinus massoniana are common species of trees,and they have an absolute advantage in the trees,and the important values of shrubs and herbs are more evenly distributed.The distribution law of arbores,shrubs and herbs in the community has the characteristics of fewer species with higher importance values and more species with lower importance values.