重建植被视角下露天煤矿区土地复垦演替过程及管控模式研究

Succession process and management mode of land reclamation in open-pit coal mine areas based on vegetation rehabilitation

  • 摘要: 重建植被在能量交换与生态循环中发挥着重要作用,其动态变化可表征煤矿区生态系统受扰动和修复的广泛细节。从植被的不同扰动状态(未扰动状态、采煤扰动状态、复垦恢复状态和修复后状态)出发,分析了煤矿区重建植被演替的6种情景:高效恢复至成熟型、低效恢复至成熟型、高效恢复而后退化型、高效恢复发展型、低效恢复发展型与无效恢复型。通过模拟重建植被发展的阶段性特征,将煤矿区土地复垦全生命周期划分为:未复垦期、土地复垦发展期(复垦初期、快速发展期和稳定发展期)和成熟期。再对不同恢复阶段的重建植被分别设置判断标准,提出煤矿区土地复垦关键保护区域的识别思路,据此确立煤矿区土地复垦管控的4种修正模式:生态保育、生态管护、生态修复、生态重建。并以黄土高原山西平朔大型露天煤矿区为研究区开展应用分析,在学习掌握重建植被发展规律基础上,通过判断土地复垦模式与矿区生态系统演变机理的适应性水平,具体落实平朔露天煤矿复垦排土场集群区生态保育、生态管护、生态修复和生态重建等4大修正模式的具体管控措施。本研究归纳了露天煤矿区重建植被动态发展的演替规律,并据此提出加强土地复垦管控的修正模式,可为国家绿色矿山建设提供方法论基础。

     

    Abstract: Rehabilitated vegetation plays an important role in energy exchange and ecological cycling, and its dynamic change can characterize the extensive details of the disturbance to and the restoration of ecosystem in coal mining areas. From the points of different disturbance states of vegetation in the coal mining area, such as the undisturbed state, the coal mining disturbance state, the restoration state and the post-restoration state, six succession scenarios of the rehabilitated vegetation in coal mining areas were analyzed, including the effective restoration to maturity, inefficient restoration to maturity, effective restoration followed by degradation, effective restoration to development, inefficient restoration to development and ineffective restoration. Next, the whole life cycle of land reclamation was divided into three stages, namely the unreclaimed stage, the development stage (the initial development stage, the rapid development stage and the stable development stage) and the mature stage by simulating the development characteristics of rehabilitated vegetation in each stage. Then, judgment criteria were set for the rehabilitated vegetation in different restoration stages, and the idea for identifying the critical protection area of land reclamation in the coal mining area was put forward. On this basis, four revision modes of land reclamation management were established, including ecological conservation, ecological management and protection, ecological restoration, and ecological reconstruction. Meanwhile, application analysis was conducted based on the study area of Pingshuo Open-pit Coal Mine on the Loess Plateau. Moreover, the specific management and control measures for these four revision modes (including ecological conservation, ecological management and protection, ecological restoration, and ecological reconstruction) were concretely implemented in the dump clustering area for reclamation of Pingshuo open-pit mining area by mastering the development rules of rehabilitated vegetation and judging the adaptability level of the land reclamation model and the ecosystem succession mechanism. In addition, the succession law in dynamic development of the rehabilitated vegetation in open-pit coal mine areas was summarized, and the revision modes for strengthening the management of land reclamation were put forward, which could provide a methodological basis for promoting the construction of national green mines.

     

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