干旱半干旱区人工封育对地表植被组成及多样性的影响——以宁夏盐池为例  

Effects of Artificial Enclosure on Vegetation Composition and Plant Diversity in Arid and Semi-Arid Region:Yanchi County,Ningxia as an Example

作　　者：庞吉林[1] 张克斌[1] 王海星[1] 王黎黎[1] 苏朋飞[1] 王晓[1] 

机构地区：[1]北京林业大学,北京100083

出　　处：《东北林业大学学报》2013年第2期40-43,共4页Journal of Northeast Forestry University

基　　金：国家自然科学基金项目(30771764);国家林业局项目(盐池荒漠化定位监测660550)

摘　　要：在2004年到2011年对宁夏盐池人工封育区内各样地群落植被进行样方调查,通过分析调查数据研究不同封育年限对群落组成、植被特征值及物种多样性的影响,进而为草场恢复和下一步的开发利用提供理论依据。研究表明:随着封育年限的延长,老封育区逐渐形成了以阿尔泰狗娃花(Heteropappus altaicus)为优势种的植被群落,而封育年限较短的新封育区和对照区还是主要以黑沙蒿(Artemisia ordosica Krasch)和刺沙蓬(Salsola rutheni-ca Iljin)为优势种的植被群落;老封育区的生物量低于新封育区和对照区,对照区的植被盖度高于老封育区和新封育区;通过对历年地表植被多样性指数的分析,各指数高峰值和低峰值有规律的出现且周期大致为5 a,这说明在干旱半干旱地区人工封育区的封育周期约为5 a。From 2004 to 2011, quadrat method was used to investigate plant growth in three sample plots with different disturbance degree in the enclosure area of Yanchi County, Ningxia Hui Autonomous Region, and study the effects of different enclosure in different years on the plant characteristic values and species diversity for further rangeland restoration, development and utilization. The results showed that with the extension of the enclosure years, the old closure gradually changes into the vegetation community with the dominant species of Heteropappus altaicus, but the new enclosure and the control region take Artemisia ordosica Krasch and Salsola ruthenica Iljin as the dominant species. The biomass in old enclosure region is less than that in the new enclosure and control region, and the vegetation coverage in control region is more than that in the old and new enclosure region. Through the analysis of vegetation diversity indices in recent years, the peak value and low peak of each index appear regularly with the cycle of five years. Therefore, the period of artificial enclosure is five years in arid and semi-arid region.

关 键 词：干旱半干旱区 封育 生物多样性 

分 类 号：Q948[生物学—植物学]