摘要
对浑善达克沙地退化草场植物群落进行OAC分类和DCCA排序结果表明,这些植物群落可分为8组:Ⅰ芨芨草(Achnatherum splendens)+星星草(Puccinellia tenuiflora)群落;Ⅱ冷蒿(Ar- temisia frigida)+冰草(Agropyron cristatum)群落;Ⅲ冰草(Agropyron cristatum)+糙隐子草(Cleisto- genes squarrosa)群落,Ⅳ大针茅(Stipa grandis)+冷蒿(Artemisia frigida)群落,Ⅴ苔草(Carix spp.)+狼毒(Stellera chamaejasme)群落,Ⅵ黄柳(Salix gordejevii)+差把嘎蒿(Artemisia haloden- dron)群落,Ⅶ虎榛子(Ostryopsis davidiana)+耧斗叶绣线菊(Spiraea aquilegifolia)群落,Ⅷ人工林下的杂类草群落。群落DCCA排序及排序轴与环境因素的相关分析表明,土壤有机质、全氮、速效磷、含水量及坡向、坡位对群落的分布与组成有显著影响。植物多样性的回归分析表明,在向阳坡和上坡地段,土壤有机质、全氮、含水量趋于减少,植物多样性趋于下降。
Classification and ordination analysis were made with the two-way detrended Canonical Correspondence Analysis （DCCA） and Ordination Axes Clustering （OAC）. The result of classification indicates that all communities were classified into eight groups. Ⅰ （Achnatherum splendens ＋ Puccinellia tenuiflora） communities; Ⅱ （Artemisia frigida ＋ Agropyron cristatum ） communities ; Ⅲ （ Agropyron cristatum ＋ Cleistogenes squarrosa ） communities, Ⅳ（ Stipa grandis ＋ Artemisia fiigida ） communities; Ⅴ （ Carix spp. ＋ Stellera chamaejasme ） mmunities; Ⅵ （ Salix gordejevii ＋ Artemisia halodendron ） communities; Ⅶ （Ostryopsis davidiana ＋ Spiraea aquilegifolia ） communities; Ⅷ Ruderal communities under the artificial forest. DCCA ordination of those communities and correlation analysis with environment factors shows that the soil organic matter, total nitrogen, soil water content, the direction and position of slope significantly affected the distribution patterns of those communities. According to the regression analysis of species diversity, on the north slope and upslope, the soil organic matter, total nitrogen and soil water content are reducing. The results proved that species diversity and environment factor have osculating relation.
出处
《干旱区地理》
CSCD
北大核心
2008年第5期759-764,共6页
Arid Land Geography
基金
国家林业局中国荒漠化监测中心多伦定位站荒漠化监测项目资助
