盐池柳杨堡人工封育区植被特征研究

封育措施是一种主要的草场恢复和重建的措施。在宁夏自治区盐池县人工封育区采用样方调查法对不同封育年限和不同封育措施下封育区植被的群落结构和生物量进行调查分析。结果表明：封育可以提高生物多样性,使群落的组成趋于稳定。但是长期封育并不利于植被恢复,边缘区和外围区分别在封育后的第五年和第四年生物多样性指数达到最大,边缘区的丰富度指数（R1）和综合多样性指数D、H分别为22、2.26、6.18,外围区的分别达到13、1.67、3.24,然后逐年减小。在不同封育措施下,生物多样性指数核心区最大,说明封育是有效的植被恢复措施。植被盖度和生物量都是外围区最大,说明对草场进行适当的利用是有利于植被恢复的。带状翻耕对植被的恢复作用并不明显,建议进行适当的放牧或刈割。

Vegetation characteristics of artificial fenced region in Liuyangpu of Yanchi county

Fencing has been used as a main measure for rangeland and pasture rehabilitation all over the world.By quadrate method,the vegetation of Yanchi County of Ningxia Hui Autonomous Region has been investigated to study the impacts of different fencing time on vegetation community structure and biomass.The result shows that it increases biodiversity and make the vegetation community more stable.But long time fencing is not conducive to the vegetation recovery.The highest biodiversity index of edge area and outside area occurred separately on the 4th and 5th year after fencing.Richness Index（R1） and Comprehensive Diversity Index（D,H） of edge areas are 22,2.26,6.18,and peripheral areas are reached to 13,1.67,and 3.24.Then biodiversity index decreased as the increasing of fencing time.Under different fencing,biodiversity Index in the core area is the highest.So fencing is an effective measure on vegetation restoration.The vegetation cover and biomass in outside areas are the largest.This shows that rational uses of the grassland are beneficial to vegetation recovery.The effect of strip tillage on vegetation recovery is not obvious,and it suggested that grazing or cutting can be used in this region for rangeland and pasture rehabilitation.