摘要
流动沙地、半固定沙地、固定沙地是沙地固定过程几个明显的阶段,每一阶段发育着典型的群落类型,沙米(Agriophyllumsquarrosum)、差巴嘎蒿(Artemisiahalodendron)、隐子草(Cleistogenessquarrosa)分别是流动沙地、半固定沙地、固定沙地上群落的优势种。沙米种子圆而扁平的形态,种子萌发后胚根的快速伸长,是其适应流动沙地风沙环境的主要特征。沙埋促进生长,生长对水分条件的快速反应以及全季生长型特征是差巴嘎蒿在半固定沙地繁茂生长的主要原因。而隐子草则以增加根系生物量投入比例、须根系形态及其分布的浅表化来适应固定沙地的旱化土壤水分条件。
There are three stages in the stabilization process of sand dunes, namely mobility, semi-fixed and fixed. Agriophyllum squarrosum, Artemisia halodendron and Cleistogenes squarrosa are the dominant species of communities on mobile sand dunes, semi-fixed sand dunes and fixed sand dunes, respectively. Main adaptive characteristics of Agriophyllum squarrosum include flat-shaped seeds and rapid growth of embryo roots after germination. The vigorous growth of Artemisia halodendron in semi-fixed sand dunes is promoted by positive growth reaction to sand burial promoting growth, rapid reaction to changed soil water conditions and perennial growth. Cleistogenes squarrosa is adapted to the arid conditions of stabilized sand dunes due to its (ability) to increasing root biomass.
出处
《水土保持通报》
CSCD
北大核心
2004年第5期1-4,共4页
Bulletin of Soil and Water Conservation
基金
国家973项目(G2000048704)
关键词
沙地固定过程
优势种
生态特性
植物
stabilization process of sand dunes
dominant species
ecological characteristics
