Flora,Structure And Biodiversity Characteristics Of Riparian Vegetation On Down-reach Floodplain Of Yellow River In He'nan

At present riparian zone mostly adopt its narrow sense definition, refers to the intersection point of river & land, until the river influence vanishes. The riparian zone is one of ecosystems which own the most complete function, previous research have indicated that riparian zone exerts important ecological function, protects biodiversity, protects shore & stagnates silt, improves partial microclimate, suppresses the non-point source pollution and so on. The management of riparian zone vegetation of river & brook, lake and wetland and so on brings into line with the forest management category to carry on research, which is one of the most revolutionary change and progress in the forestry in later of 20^th century.Function of riparian vegetation zone is an important content of riparian zone research, but plant is the foundation of flora, structure and biodiversity. This experiment selected massive quadrats to investigate riparian vegetation by method of united model sample and system sample in the Zhengzhou Mangshan, Changyuan, Wenxian and Mengjin of Henan province, the generalized result as followed:Among riparian vegetation zone on Yellow River down-reach floodplain in Henan herbaceous plants dominate the community, arbores is artificial protective forest (belt) or productive forest; The Mangshan area of Zhengzhou and the Wenxian has few wild tamarisks scrub forest, in herb the gramineae, the compositae, the papillionaceae has the absolute superiority, in the whole vegetation presents the tropics and temperate zone origin, and the minority branch class own many kinds, but in whole widowed kind; an obvious connection of this flora is found in longitudinal direction with its upper and down reach flora and a transverse direction connection with that of Huang Huai plain is found as well, which reveals the continuity and integrity of Yellow River flora.This paper calculated forest individual size score and covariance of DBH,crown and tree height of different quadrats to analyze the forest minute individual growth differentiation, and calculated the neighborhood pattern to study the quadrat forest minute overall spatial distribution, finally discovered plantation play the most important role in the riparian artificial forest on down-reach of Yellow River in Henan, moreover same ages and same forest form, the individual growth had the certain degree of differentiation to some extent, quadrats interfered by mankind has more...