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    崆峒山灌木种质资源调查及群落演替过程

    Investigation of shrub germplasm resources and community successionin Kongtong Mountain,eastern Gansu Province

    • 摘要: 崆峒山区内植物种类较多,植被类型复杂,有种子植物 90 科 356 属 702 种,其中野生类有 88 科 343 属 662种,是一所难得的自然物种基因库。 在近十几年内其植被得到迅速恢复,至 2011 年森林覆盖率由 1996 年的37.4%增长到45.8%,灌木林地由1996 年的3216 hm2增加到3865 hm2。 灌木林地面积增加的同时,其群落结构也经历了复杂的演替变化。 为研究崆峒山不同生境条件下灌木群落结构及植被景观变化,采用样线技术调查方法,对崆峒山灌木群落及成份进行全面调查,就崆峒山灌木群落与生态环境的相互关系、不同生态条件下灌木群落组成、灌木群落结构及灌木群落的演替进行了系统分析。 研究表明:崆峒山灌木、亚灌木、木质藤本物种142 种,分属于39 科、74 属,除1 科、1 属、2 种为裸子植物外,其余均为被子植物;不同灌木物种具有一定的空间分布特征,其中随海拔变化的垂向分布具有一定层次性;4 种坡向条件下灌木群落组成不同,其中,阳坡分布的主要树种 12 种,以白刺花为建群种,半阳坡分布的主要树种14 种,以沙棘为建群种,半阴坡和阴坡分布的主要物种分布分别有 12种和15 种,以虎榛子为建群种;在不受外界扰动情况下,灌木群落的演替始于裸露荒地,期间大致经历天然草地、灌草混生、灌木群落、亚灌木群落(单优群落),并最终向乔木群落演替。

       

      Abstract: In the region of Kongtong Mountain of eastern Gansu Province, there are various and complextypes of plants with seed plants 702 species in 356 genera of 90 families, in which 662 species in 343genera of 88 families are wild type. It is a valuable natural species gene pool. The forest coverage rateincreased from 37.4% in 1996 to 45.8% in 2011, and shrub land area increased from 3216hm21996 to 3 865hm2 in 2011. Accompanying with the shrub land area increasing is the complex successional change of community structure. In order to clarify the structure and community of shrubs and vegetation landscape change of Kongtong Mountain under different habitat conditions, we conducted a resource scensus in the Kongtong Mountain forest region with rich shrub resources banned for many years. Theregion was divided into four different habitat types according to the aspect and location, i. e., sunny,semi-sunny, semi-shady and shady. According to the detailed investigation of habitat types, a basesurvey line was selected along each of the channels, slope moldings, ridges and other typical geomorphology. Finally, 13 sample lines and 115 determination sections were set. We systematicallyanalyzed the relationship among shrub community, ecological environment, shrub communitycomposition, structure and community succession in the Kongtong Mountain under various ecologicalconditions. The results showed that there are a total of 142 species of shrub, sub-shrub and liana plants,belonging to 39 families and 74 genera. Except for one family, one genus and two species that belong to the gymnosperms, they are all angiosperms with most species belonging to North China Flora. Various shrubspecies have their certain spatial distribution features. There is a certain hierarchy along the verticaldistribution that can be divided into three elevation zones: 1 393-1 496 m, 1 796-1 946 m and 1 946-2046 m. Shrub community compositions are different under four slope conditions with 12 main species distributed in sunny slopes and Sophora davidiias the constructive species, 14 main tree species in semi-sunny slopes and the sea buckthorn as constructive species,12 main tree species in semi-shady slopes, and 15 main tree species in shady slopes and the ostryopsis as constructive species. In the case without disturbance, the succession of shrub community began from the bare wasteland during the period, and hasprobably experienced natural grassland, mixed shrub and grass, shrub community, sub-shrub community and the ultimate succession of arbor community. It is a complicated system for the development andutilization of shrub resources in Kongtong Mountain and therefore we must strengthen the protection anddevelopment of shrub resources and plan utilization, vigorously protect the suitable shrubs such asSophoradavidii, sea buckthorn,Prunus davidiana, caragana,Ostryopsisand so on, expand the scale ofresources, and ensure the sustainable development and succession of shrub community in the region.

       

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