宁夏贺兰山主要旱生植被种类组成区域分异及植被资源的保护利用

REGIONAL VARITION OF SPECIES COMPOSITION AND PROTECTIVE UTILIZATION OF XEROMORPHIC VEGETATION ON THE EAST FACE OF HELAN MOUNTAIN

本文以定量和定性分析相结合,分析了宁夏贺兰山海拔1200—1900m范围内主要旱生植被种类组成的区域分异,植被性质。结果表明,该范围内主要旱生植被均具有荒漠草原和荒漠草原化的共同特点,其种类组成均在北、中、南不同地段存在一定差异。此差异反映出本区海拔1600m以上的中部地段及其以下的北部地段是生态环境最湿润和最干旱的区域,因而在植被资源的保护利用方面也应采取相应地不同措施。

In this paper, by using quantitative and qualitative methods, the regionaldifferences of floristic composition and the nature of vegetation in the lowerzone on the eastern slope of the Helan Mountain Range have been analysed,and the relationship between the species groups as a result of the ordinationand ecological environments in the zone has also been discussed. The resulsof analysis show that all the main forms of vegeiation in the zone have thecommon characters of desert or desertified steppe vegetation and the composi-tion of the vegetation is different in the northern, middle and southernparts of the zone. Those differences reflect that, in the zone, the mosthumid area and the most arid area are respectively the middle parts abovethe altitude of 1600 meters and the northern part below it. Therefore,in thezone, it is necessary to make use of and to conserve the vegetation resourcesin different ways.