veg_recon

Beginning in the middle-late Holocene, anthropogenic land cover change has a profound impact on both regional and continental environments. Here we used two representative pollen records in North China and a novel methodological to quantitatively reconstruct the Holocene land cover changes. The results indicate diverse vegetation succession patterns in different regions and geomorphologic contexts. Changes in the intensity of human activities may one major reason of contribute to regional disparities in vegetation succession. In larger basin/plain areas, the favorable climatic conditions during the mid-Holocene promoted human activities; while later, population pressure, the increased demand for resources, and political factors may have triggered the diffusion of human populations from basins to the mountains or undeveloped areas with resulting effects on their vegetation succession. The anthropogenic impacts dominated the natural environment in Mountainous areas at least for the last 1,300 years.

全新世中晚期以来，人为土地覆盖变化对区域乃至大陆尺度的环境均产生了深远影响。本研究选取华北地区两处典型孢粉记录（pollen records），采用全新的定量化研究方法定量重建了全新世土地覆盖变化。研究结果显示，不同区域与地貌背景下的植被演替模式存在显著差异。人类活动强度的变化，是造成植被演替区域差异的核心诱因之一。在大型盆地/平原区域，全新世中期适宜的气候条件推动了人类活动的发展；而在后期，人口压力、资源需求增长以及政治因素，可能促使人类群体从盆地向山地或未开发区域扩散，进而对这些区域的植被演替造成影响。至少在近1300年以来，山地自然环境的演化已以人为影响为主导。