典型草原退化群落在恢复演替进程中种群格局的变化过程及其机理研究

羊草+大针茅草原是蒙古高原广泛分布的地带性草原群落，具有优良的生产性能。由于过度放牧，自20世纪90年代以来，典型草原的退化已十分严重。因此，典型草原受损生态系统恢复演替的研究成为生态学家关注的热点。在群落恢复演替动力的驱动下，受损草原生态系统在恢复演替中所反映的生态学过程可描述为从抢占资源空间的种间竞赛、斑块间相互作用到个体间相互作用的植物个体、种群行为的演变。故本项研究拟针对典型草原带处于不同恢复演替阶段的草原群落，应用摄影定位法监测这一生态过程，分析不同种群空间格局及种间关系在恢复演替进程中的变化过程及其机理，以期从种群格局与种间关系角度揭示退化草原生态系统的恢复演替机理，为退化草原生态系统的恢复提供理论依据和指导。

The typical steppe dominated by Stipa grandis and Leymus chinensis is the zonal vegetation that occurs extensively in the Inner Mongolian Plateau of China. It has been disturbed heavily by overgrazing in China, which resulted in serious degradation and characteristic vegetation pattern. Therefore, restoring succession has become the issue in typical steppe. When the seriously degraded community was fenced-off, preventing grazing by large animals, in the early stages of succession, plant populations began to colonize and formed various clumps because of therelative surplus resource. Over time, with surplus resource disappearance in the community, the competition occurred among plant individuals and became drastic gradually. Therefore, we tried to detect restoring succession mechanisms from population spatial patterns and species associations by monitoring the ecological processes in different restoring succession stages in the typical steppe.