永定河(北京段)植物多样性及覆盖度变化研究

Research on changes of plant diversity and coverage along Yongding River of Beijing section

为了准确掌握永定河(北京段)植物多样性及覆盖度现状,采用标准样地法,研究了永定河(北京段)山峡段、平原北段、平原南段植物多样性及覆盖度变化。得出以下结论:(1)山峡段、平原北段植物种类相对较多,植物多样性相对较高,植物Shannon-Wiener指数分别为1.515、1.523;植被覆盖度较高,分别达到68.47%、52.22%;(2)平原南段植物种类相对较少,植物多样性相对较低,植物Shannon-Wiener指数为1.314,植物种类以沙生植物为主,植被覆盖度较低,仅为36.75%。(3)山峡段、平原北段应以生态保护为主,而平原南段应以生态修复为主。此研究为永定河生态修复和保护提供技术支撑,重点支撑后续开展平原南段生态治理的植被恢复。

In order to accurately grasp the current status of plant diversity and coverage in YongdingRiver(Beijing section), the changes of plant diversity and coverage in the gorge section, northern-plainsection and southern-plain section of Yongding River(Beijing section) were studied by using the standardsample land survey method. The result showed that:(1) There were relatively more plant species in thegorge section and the northern-plain section, and the plant diversity was relatively high, theShannon-Wiener diversity index was 1.515 and 1.523, respectively, and the plant coverage was relativelyhigh, reaching 68.47% and 52.22%, respectively.(2) There were relatively few plant species in thesouthern-plain section, and the plant diversity was relatively low in this section, the Shannon-Wienerdiversity index was 1.314, and the main plant was psammophyte, the plant coverage was low, only36.75%.(3) Ecological protection in the gorge section and the northern-plain section should be paidattention to, while ecological restoration should be in the southern-plain section. This paper couldprovide theoretical basis for the ecological restoration and protection of Yongding River and support thesubsequent vegetation restoration for the ecological management of the southern-plain section.