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高寒草甸退化:驱动机制、修复技术与可持续管理

Conservation of alpine meadows: current status analysis, challenge responses, and future perspectives

  • 摘要: 高寒草甸作为独特的高寒生态系统,在碳固存、水源涵养和生物多样性保护方面具有不可替代的生态功能。然而,气候变化与人类活动的双重胁迫导致其退化加剧,青藏高原地区约16.5%的高寒草甸已退化为植被覆盖度低于30%的“黑土滩”,生态系统服务价值降至原生状态的5%~10%。系统梳理了高寒草甸退化过程及其驱动机制,揭示了退化阶段的植被演替规律与土壤退化特征。在修复技术方面,短期围栏封育(<5 a)可使植被生物量恢复至退化前的75%~85%,但长期封育(>10 a)会引发毒草占比激增的次生风险。人工辅助技术中,补播本地草种配合生物炭改良和有机肥施用可显著提升恢复效率,使土壤全氮含量提高0.15~0.25 g·kg−1、微生物量碳增加50%~70%、持水量提升28%。然而,现有技术仍面临气候暖干化导致的冻融循环加剧、极端降水频发等技术适配性挑战,以及生态保护与社区生计的深层次冲突。当前研究存在三大瓶颈:退化阈值判定标准异质性显著,长期生态观测数据连续性不足(仅7.3%站点具备>15 a数据),以及气候-放牧耦合模型精度有限。未来研究应聚焦多尺度生态过程解析,发展基于自然解决方案(NbS)的气候适应技术,构建“观测-模拟-管理”一体化框架。建议重点突破植物-土壤反馈机制、冻融循环与碳氮耦合过程等微观机理,同时加强3S技术与物联网的融合应用,通过多平台遥感数据融合和深度学习算法提升监测效能。实践层面需统筹生态阈值管理、海拔梯度修复(3800~4200 m优先区)和乡土种质资源库建设,最终实现生态功能恢复与社会经济发展的协同优化。本文为高寒草甸的系统性保护与适应性管理提供了理论依据和技术路径。

     

    Abstract: Alpine meadows, as unique alpine ecosystems, play irreplaceable ecological roles in carbon sequestration, water conservation, and biodiversity protection. However, the combined stress of climate change and human activities has exacerbated their degradation. Approximately 16.5% of alpine meadows on the Qinghai-Tibet Plateau have degenerated into "black soil beaches" with vegetation coverage below 30%, causing ecosystem service values to drop to 5%~10% of their original state. This paper systematically reviews the degradation processes of alpine meadows and their driving mechanisms, revealing the vegetation succession patterns and soil degradation characteristics at different degradation stages. In terms of restoration technologies, short-term fencing enclosure (<5 years) can restore vegetation biomass to 75%~85% of pre-degradation levels, but long-term enclosure (>10 years) may trigger secondary risks such as excessive proliferation of toxic weeds. Among artificial auxiliary techniques, reseeding with native grass species combined with biochar amendment and organic fertilizer application significantly enhances restoration efficiency, increasing soil total nitrogen content by 0.15~0.25 g·kg−1 and microbial biomass carbon by 50%~70%. Nevertheless, existing technologies still face challenges in technical adaptability due to intensified freeze-thaw cycles and frequent extreme precipitation caused by climate warming and drying, as well as deep-seated conflicts between ecological protection and community livelihoods. Current research faces three major bottlenecks: significant heterogeneity in degradation threshold criteria, insufficient continuity of long-term ecological observation data (only 7.3% of stations have data exceeding 15 years), and limited accuracy of climate-grazing coupling models. Future studies should focus on analyzing multi-scale ecological processes, developing nature-based solutions (NbS) for climate adaptation, and constructing an integrated framework of “observation-simulation-management”. Priorities include breaking through micro-mechanisms such as plant-soil feedback mechanisms and the coupling processes of freeze-thaw cycles with carbon-nitrogen dynamics, while strengthening the integrated application of 3S technologies (remote sensing, geographic information system, global positioning system) and the Internet of Things. Monitoring efficiency should be improved through multi-platform remote sensing data fusion and deep learning algorithms. At the practical level, coordinated efforts are needed in ecological threshold management, altitude-gradient restoration (prioritizing 3800~4200 m elevation zones), and the construction of local germplasm resource banks to achieve synergistic optimization of ecological function restoration and socioeconomic development. This paper provides a theoretical basis and technical pathway for the systematic protection and adaptive management of alpine meadows.

     

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