荒漠草原不同放牧制度群落稳定性研究

Studies on Community Stability under Different Grazing Systems on Desert Steppe

在短花针茅荒漠草原,对比研究了不同放牧制度群落植物重要值和多样性,研究结果表明:划区轮牧和对照区重要值较高的植物为短花针茅、无芒隐子草、碱韭和糙隐子草,自由放牧区1年生植物重要值较高;2002年Shannon-Wiener、Simpson和Pielou群落多样性指数自由放牧区偏高于轮牧区,但从3种指数的影响因子重要值的分布上看,轮牧区主要分布在建群种和优势种上,自由放牧区分布在建群种、伴生种和1年生植物上,可以认为轮牧条件下群落环境更稳定。

A comparative study on plant importance values and community diversity under different grazing systems was conducted in desert steppe of Inner Mongolia Plateau. The results showed that the importance values of Stipa breviflora, Cleistogenes songoriea, Allium polyrhizum and C. squarrosa were higher in the rotational grazing area and in closed area than in the free stocking area, while the importance values of annual plants were higher in the free stocking area. In year 2002, Shannon-Wiener index, Simpson index, and Pielou index were all found higher in the free stocking area than in the rotational grazing area. However, the distribution of importance values for the influential factors with these indexes was concentrated on several dominant and constructive species, which indicated that rotational grazed grassland was more stable than the free stocked one.