宁夏荒漠草原植物功能群特征

The characteristics of plant functional groups on desert steppe in Ningxia

在宁夏盐池县试验区封育近十年的荒漠草原围栏内,研究不同微地形条件对荒漠草原植物功能群的影响.采用样线取样法在坡面尺度上调查不同坡位上植物功能群的特征.结果表明,多年生草本功能群对垂直空间资源的竞争能力及水平拓展能力都保持优势地位;不同坡位导致群落的优势功能群发生改变;草地群落稳定性低,多年生草本功能群对群落稳定性的贡献大于一年生草本和矮小半灌木功能群.

The experiment was conducted in enclosed desert steppe in Yanchi County of Ningxia. The characteristics of plant functional groups in different slope locations were studied. The line transect and quadrat methods were used to survey the vegetation in the field. The results showed that the horizontal growth ability of perennial herb functional group kept dominant role in community. Slope locations affected the species distribution pattern along the slope and mainly in dominant plant functional group. It is found that the stability of perennial herb functional group was higher than biennial herb and semi-dwarf shrubs in slope scale, it lead to a increase in community stability.