中国陆地生态系统动态生境指数格局及时空动态分析
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国家自然科学青年基金项目(42201339);国家重点研发计划项目(2021YFB3901102)


Spatiotemporal dynamics and patterns of dynamic habitat indices in China's terrestrial ecosystems
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    摘要:

    生境是生态系统中维持生物多样性和生态过程的重要载体,植被生产力的状况和变化直接决定了生境的异质性。近年来,生态修复工程的实施推动了中国生境质量好转和生态系统结构变化,系统解析生境质量变化规律对提升我国生态系统服务功能和保护生物多样性具有重要意义。基于卫星遥感大数据构建的动态生境指数(DHIs)从可用能量、环境稳定性、环境压力三方面有效评估生境生产力与生物多样性。为明确近十余年中国的生境生产力状况及动态变化特征,基于Google Earth Engine平台计算了中国累积DHI(DHIcum)、变异DHI(DHIvar)与最小DHI(DHImin),利用时间序列分析方法,对中国大陆地区(不含港澳台)2010-2023年的DHIs变化进行了研究,揭示了我国不同生态系统、整体的DHIs格局及其DHIs的时空变化差异。综合来看,DHIs在生态环境质量监测、生物多样性管理与评估中具有不同的侧重和互补的重要意义。研究表明:(1)空间上,我国东南沿海向西北内陆地区累积生产力逐步递减、环境压力增加;东南沿海环境稳定性高于西北内陆。(2)14年来中国大陆区域50%以上植被覆盖区总初级生产力改善,总体改善主要分布在大小兴安岭、四川盆地,云贵高原等区域,改善较为明显。(3)约三分之一区域受干旱气候与人类活动加剧的影响,生产力出现退化,以大兴安岭北部、青藏高原中部、洞庭湖流域等为主,其中洞庭湖流域等地区受土地利用类型转变影响较大。生境生产力变化与气候及生态保护工程等其他人类活动密切相关,植树造林、荒漠化治理等重大工程为提升生产力水平做出了重大贡献,而城镇扩张等城市化建设则限制了其地区的生产力水平。总体来看,各生态系统DHIs为可用能量、环境稳定性提高,环境压力降低为主的趋势,森林虽环境稳定性和压力改善明显,但累积生产力退化略高。多种生态系统DHIs变化趋势具有明显空间异质性。研究结果为中国生态保护和生物多样性监测评估提供了科学参考。

    Abstract:

    Habitats play an essential role in maintaining biodiversity and sustaining ecological processes in ecosystem. In recent years, ecological restoration projects have improved habitat quality and altered ecosystem structures across China. Systematically analyzing the patterns of habitat quality change is crucial for enhancing ecosystem services and protecting biodiversity. The condition and variability of vegetation productivity directly influence habitat heterogeneity, thus shaping ecological dynamics and diversity patterns. In this study, the Dynamic Habitat Indices (DHIs) are derived from time-series data of satellite remote sensing to evaluate habitat productivity and biodiversity, consisting of available energy, environmental stability, and environmental stress. To clarify the productivity status and dynamic trends of terrestrial habitats over the past decade in mainland China (excluding Hong Kong, Macao, and Taiwan), we systematically calculated cumulative DHI (DHIcum), variation DHI (DHIvar), and minimum DHI (DHImin) using the Google Earth Engine (GEE) cloud computing platform. Based on time-series analysis methods, this study examined the spatiotemporal variations of DHIs from 2010 to 2023, revealing the overall patterns and differences in DHIs across various ecosystems. Overall, DHIs demonstrate distinct yet complementary significance in ecological environment quality monitoring and biodiversity management and assessment. The results indicated that: (1) Spatially, cumulative productivity decreased gradually, and environmental pressure increased from southeast coastal regions to northwest inland areas; environmental stability was higher in the southeast coastal regions compared to the northwest inland regions. (2) Over the 14-year period, vegetation productivity improved in more than 50% of vegetated areas, with significant improvements mainly distributed in the Greater and Lesser Khingan Mountains, Sichuan Basin, and Yunnan-Guizhou Plateau. (3) Approximately one-third of the regions experienced productivity degradation driven by intensified arid climatic conditions and increased human activity, prominently in northern Greater Khingan Mountains, the central Tibetan Plateau, and the Dongting Lake Basin. Specifically, areas such as the Dongting Lake Basin have been significantly influenced by changes in land-use types. Changes in habitat productivity closely related to climate conditions and ecological restoration projects. Major ecological initiatives, such as afforestation and desertification mitigation projects, have substantially contributed to enhanced productivity, whereas urbanization processes, including urban expansion, have constrained productivity within affected areas. DHIs generally indicated a trend of increased available energy, improved environmental stability, and reduced environmental pressure. Forest ecosystems, despite notable improvements in environmental stability and reduced pressure, showed slightly higher degradation in cumulative productivity. DHI trends across various ecosystems exhibited distinct spatial heterogeneity. The findings offer scientific references for ecological conservation strategies as well as biodiversity monitoring and assessment initiatives across China.

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段昊玮,杨莹莹,万华伟,王永财,张玉沙,卢龙辉,万凤鸣,代玉.中国陆地生态系统动态生境指数格局及时空动态分析.生态学报,2026,46(2):691~704

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