杂谷脑河干旱河谷区灌丛植被种-面积与坡向及海拔梯度的相关性研究

在对杂谷脑河流域的干旱河谷植被进行全面踏查的基础上,综合选择具有典型性、代表性,且人畜干扰少的阴、阳两坡面,在两坡面各设3个海拔梯度,每个海拔梯度间隔约300 m,采用植物群落学的最小面积法对杂谷脑河干旱河谷区灌丛植被种-面积进行调查研究。结果表明:该区的维管植物及其灌木和草本不论在阳坡还是阴坡,随着海拔梯度的上升,它们的最小面积都在逐渐增大,而最小面积所含的种数也随之增大;在相近海拔梯度上,阴坡的最小面积都比阳坡大,且最小面积所含种数也发生规律性变化。

Research on the Correlation of Plant Species-area with Shady Slope and Sunny Slope and Different Altitudes in the Arid-valley Region of the Zagunao River

According to the whole investigation of vegetations in the arid-valley region of the Zagunao River,two slopes are selected,which are typical and representative and suffer little man and poultry interference.Three different altitude gradients are set on each slope,the distance between neighboring altitudes are 300 m or so,minimal area way of phytocoenology is used in the investigation and research of species-area of arid-valley vegetations of the Zagunao River.Some conclusions obtained are as follows:In this region minimal areas of vascular plants and shrub species and grass species,which are found on sunny slope or shady slope,all increase gradually with the enhancing of altitude,and the number of species inside their minimal areas also increase;At the nearly same altitudes,minimal area of shady slope is bigger than that of sunny slope,and the number of species inside their minimal area varies regularly.