晋西黄土丘陵沟壑区植被演替规律研究

以山西省方山县土桥沟小流域为例,采用样线、样方相结合的调查方法,初步研究了晋西黄土丘陵沟壑地区植被的演替规律.结果表明,该地区乔木层以油松、刺槐为优势种,重要值分别为117.34,69.96;灌木层以胡枝子、小叶锦鸡儿、沙棘为主,重要值分别为169.45,74.05,36.92;草本层以铁杆蒿、赖草等菊科及禾本科植物为主,重要值为126.18,82.63.对比和聚类分析表明,土桥沟小流域典型群落类型为黄刺玫群丛、沙棘群丛、达乌里胡枝子群丛、油松群丛、刺槐群丛、华北落叶松群丛、白榆群丛、侧柏群丛.该地区植物种的演替序列大致为:次生裸地-草地阶段-杂灌阶段-先锋乔木林阶段-针叶林阶段.整个流域的演替方向是在朝着刺槐群落、油松群落、白榆群落、侧柏群落、白榆刺槐混交群落方向演替.

A Study of Vegetation Succession in the Loess Hill and Gully Area of Western Shanxi Province

By using the combined grid and line method in vegetation investigation,vegetation succession in the hill and gully area of western Shanxi Province was studied by a case study of Tuqiaogou small watershed in Fangshan County of Shanxi Province.Results showed that Chinese pine and silver chain(importance value:117.34 and 69.96,respectively)are predominant species of the tree layer in the area.Lespedeza,C.microphylla,and seabuckthorn(importance value:169.45,74.05,and 36.92,respectively)are predominant species of the shrub layer.The herblayer is made of composite and gramineous plants(importance value:126.18and 82.63,respectively).Analysis of comparison and clustering showed that community types are pine cluster and lespedeza cluster in Tuqiaogou small watershed.Vegetation succession list is from bare groud,grassplot,shrub,pioneer trees to co nifer.Succession direction of the whole watershed is toward the silver chain community,Chinese pine community,elmcommunity,arborvitae community,and elmsilver chain mixed community.