河北坝上沙漠化土地褐沙蒿、冷蒿土壤生境特征研究

SOIL HABITAT CHARACTERISTICS OF ARTEMISIA PLANTS IN DESERTIFIED LAND OF BASHANG HEBEI PROVINCE

应用典范分析与聚类、回归分析相结合的方法，研究了河北坝上沙漠化土地褐沙蒿（Ａｒｔｅｍｉｓｉａｉｎｔｒａｍｏｎｇｏｌｉｃａ），冷蒿（Ａ．ｆｒｉｇｉｄａ）土壤生境的分类、排序及冷蒿、褐沙蒿生长分布与土壤条件的关系。结果表明：沿丘陵阴坡、平滩草地、丘陵顶部、丘陵阳坡、半阴坡砂质缓坡、固定沙地、半固定沙地依次沙漠化逐渐严重的土壤退化梯度，随着土壤中０．０５ｍｍ以下颗粒、土壤有机质、全氮、全钾含量的减少，褐沙蒿在群落中的重要值显著增加；冷蒿的生长分布不随土壤生境的变化而明显变化，而是与放牧强度有关。因此，褐沙蒿是本区土地沙漠化的指示植物，冷蒿是本区由于过牧引起的草场退化的指示植物。

The soil hahtat types and the distribution of Artemisia intramongolica and A.frigida in relation to the soil conditions in deserti fied land of Bashang region, Hebei province were studied bycluster and regression analytical methods.The analytical results showed that Artemisia intramongolicabecomes more and more important in the plant association on the increasingly accentated desertifiedlocalities,namely shady slopes of hills,flat grassland,sunny slopes of hills,gentle semi-shady sandyslopes,fixed sandy land and semifixed sandy land. The distribution of A.frigida is mainly related tograzing intensity rather than soil habitat conditions. Therefore. A. intramongolica can be used as anindicator plant of land desertification,while A. frigida can be used as an indicator pant of grasslanddegtadation caused by overgrazjng.