论丹霞地貌区生态演替特征及其科学价值

论述了丹霞地貌区生态演替的特征及其科学价值.认为植被演替由于时间漫长、过程复杂而对其研究具极大的难度,时空互代成为演替研究的重要手段,而这需要有完整的空间序列.丹霞地貌区存在着完整的原生演替与次生演替系列.典型丹霞地貌的山顶为原生演替的矮灌木林和乔木林,周围斜坡仍然受季节性降水侵蚀、风化、重力崩塌等作用,原生演替不断从裸露的岩石开始,故形成原生演替早期的苔藓、草本群落,随着岩石的进一步风化和苔藓、地衣等植物的作用,土壤层增厚,将原生演替继续往前推进.特殊的地质地貌过程使之不断有新的崩塌,从裸露的岩石开始的新的原生演替,如此形成不同时间系列的原生演替阶段.丹霞地貌区也存在着完整的次生演替系列,同时存在演替先锋林、演替过渡林和演替基本稳定林.这两个演替系列提供了一个非常难得的理想场所,使得生态学工作者在一个地点就可以观察到一个完整的植被演替系列.其研究可为该区域植被的经营管理和保护措施提供必要的依据.作为生态恢复参照系,对区域的植被生态恢复具有重要的指导意义.＃

The characteristics and scientific values of ecological succession in Danxia

The characteristics and scientific value of ecological succession in Danxia Landform were discussed in this paper. It was known that researches on vegetation succession were quite difficult for its long-term and intricate process. Space-for-time substitution is an important method to study succession, while it needs intact spatial succession series. In Danxia Landform, there are such primary and secondary succession series. On the hilltops, there are typical low shrubberies and arboreal forests of primary succession. The surrounding slopes are subjected to seasonal rainfall erosion, weathering action, gravitational collapse. The primary succession constantly starts from bare rocks, and then moss and herbage communities. With further weathering of rock and effects of moss and lichen, soil layers are getting thicker and thicker, which pushes primary succession ahead. New collapses are ceaselessly induced by the special geology geomorphological process, and then a new primary succession starts from bare rocks. Thus, different stages of primary succession are formed in Danxia Landform. In addition, the secondary succession series exist in Danxia Landform, including the pioneer forests, transitional forests and basically steady forests. Danxia Landform provides ideal sites for vegetation succession study. And the relative studies would be helpful for the vegetation management and protection in this area. As ecological restoration reference, it is also meaningful for the vegetation restoration.