黄土高原丘陵沟壑区草地植物群落健康动态评价

Dynamic assessment of steppe community health in loess hilly and gully region

植被恢复重建是遏制水土流失的有效措施之一,研究植被恢复重建过程、评价植物群落健康状况对加速植被建设具有重要的实践意义。本文根据黄土丘陵沟壑区的特点,建立了植物群落健康评价指标体系,对草地植被恢复重建过程中的不同阶段的植物群落的健康状况进行了评价。结果表明:植被群落活力变化过程呈抛物线型;群落组织力基本呈波动性变化;恢复力的变化则与活力变化过程相反,在群落活力达到最高水平时,群落的恢复力降至最低;土壤健康呈波动性上升的变化趋势。综合评价表明,植物群落健康水平随着演替过程的发展呈波动性且逐渐上升的变化过程。

Vegetation restoration and rehabilitation is one of the effective measures in controlling soil erosion. To study the process of vegetation restoration and rehabilitation and to assess vegetation community health are of great practical significance in speeding up vegetation construction. Based on the characteristics of loess hilly and gully region, a relevant index system for vegetation community health assessment was built to assess the health status of the steppe community at different stages of vegetation restoration and rehabilitation. During the process of vegetation restoration and rehabilitation, the vigor of steppe community changed in parabolic, the organizing force of the community was basically in fluctuation, and the restoring force changed in opposite way to the vigor. When the vigor index reached to the maximum, the restoring index dropped to the minimum. Soil health presented a fluctuated improving trend. The comprehensive assessment indicated that with the succession of vegetation, the steppe community health in loess hilly and gully region had a fluctuated ascending trend.