松嫩平原羊草草地水淹干扰恢复过程的群落动态

Dynamics of communities on the restoring process of flooded disturbance in Leymus chinensis meadow of the Songnen plain in China

根据随机取样的测定数据,经过幂函数和多元回归分析及相关检验,揭示了草地水淹干扰对羊草+寸草苔、羊草+杂类草群落数量性状的变化规律。水淹干扰对草地植被的物种组成及其比例有明显的影响。水淹后基本恢复到正常草地的种类数量和生产量配置大约需要6～7年。随着生境水分减少和土壤变干,羊草种群的数量和生物量均以幂函数形式增加,而寸草苔和杂类草的数量和生物量则呈先增后降的变化过程。

Based on the data that were measured from random samples and through the power function, multiple regression analysis as well as the correlation detection, the change rules of Leymus chinensis+Carex duriuscula and Leymus chinensis+weed communities were showed by numeric characters in flooded disturbance. The effect of the flooded disturbance to the grassland vegetation was significance in the component and proportion of species. The number of species and components of biomass were generally restored to turn out Leymus chinensis meadow after flooded about 6~7 years. Along with the less water of the habitat and the drier of soil, the number and biomass of Leymus chinensis population increased by power function, while the number and biomass of Carex duriuscula and weeds increased firstly and decrease afterwards.