红河干热河谷不同恢复模式下植被对干旱的抵抗力
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X171.4,Q948.1

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国家自然科学基金面上项目“丛枝菌根真菌在稀树草原土壤多功能性维持中的关键作用和机制”(32371785);云南省科技厅项目“红河干热河谷区生态修复及绿色发展模式关键技术集成应用”(202302AE090023);云南省科技厅项目“云南省山地农业生态系统国际联合实验室”(202303AP140001);云南省科技厅项目(202205AM070007)


Drought resistance of vegetation under different ecological restoration patterns in Honghe dry-hot valley
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    摘要:

    [目的] 探索不同生态恢复模式下旱季植被的时空变化规律及其对干旱抵抗力的响应,为干热河谷区域植被生态恢复提供基础数据和理论依据。[方法] 以恢复了3 a的乔灌草立体恢复台地(ASH)、自然恢复地(NET)、自然恢复灌木草丛(SG)为研究对象,重度干扰的退化地(DG)作为对照,设置固定样地,结合植物群落调查、无人机监测以及微气候记录,比较不同样地在旱季初期与旱季末期在物种组成、物种多样性、覆盖度以及微气候特征等方面的差异。[结果] ①物种组成和多样性。旱季期间,ASH的物种组成变化小,物种多样性高,优势物种不明显。NET物种丰富度较低,物种组成相对简单,但现有物种的分布较为均匀。SG物种组成变化较大,旱季末期物种丰富度与均匀度均显著下降。②植被覆盖度。旱季初期总覆盖度(FVC)从大到小依次为:ASH>NET>SG>DG,旱季末期与初期情况基本一致。旱季初末期,NET变化幅度最大,其次为ASH,DG变化幅度最低。ASH在不同时期的覆盖度均显著高于其他样地。③微气候调节:在旱季初期和末期相较于其他植被类型ASH的空气温度更低,而空气湿度更高。[结论] 乔灌草立体植被结构在调节微气候和维持生态稳定性方面具有明显优势,适合在干热河谷等气候条件极端的区域推广。

    Abstract:

    [Objective] The spatiotemporal variation patterns of vegetation during the dry season and their response to drought resistance under different ecological restoration patterns were explored to provide fundamental data and theoretical support for vegetation ecological restoration in Honghe dry-hot valley. [Methods] Three types of restoration patterns were taken as study cases: an artificially constructed arbor-shrub-grass stereoscopic restoration terrace (ASH) that had been restored for three years, naturally restored land post artificial terrace development (NET), and naturally restored shrub-grassland (SG), with degraded land (DG) as the control. Fixed sample plots were established, and a combination of vegetation community surveys, drone monitoring and microclimate recording was used to compare species composition, species diversity, vegetation coverage and microclimate characteristics between different plots at the beginning and end of the dry season. [Results] ① Species diversity: During the dry season, ASH exhibited minimal changes in species composition, with high species diversity and no clear dominant species. NET exhibited high species evenness but relatively low species richness. SG experienced significant changes in species composition, with both species richness and evenness showing significant declines by the end of the season. ② Vegetation coverage: At the beginning of the dry season, the total fractional vegetation cover (FVC) ranked as ASH > NET > SG > DG, and this pattern remained consistent at the end of the dry season. The degree of change in FVC between the beginning and end of the dry season was greatest in NET, followed by ASH, with DG showing the least change. ASH had significantly higher coverage across all vegetation layers compared to other plots. ③ Microclimate regulation: During the early and late dry seasons, the ASH vegetation exhibits lower temperatures and higher humidity characteristics compared to other vegetation types. [Conclusion] The arbor-shrub-grass stereoscopic vegetation structure demonstrates significant advantages in regulating microclimate and maintaining ecological stability, and therefore making it suitable for promotion in regions with extreme climatic conditions, such as dry-hot valleys.

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谭莹莹,沈婷,周绍齐,冯毅君,桂恒,许建初.红河干热河谷不同恢复模式下植被对干旱的抵抗力[J].水土保持通报,2025,45(4):113-123

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  • 收稿日期:2024-10-15
  • 最后修改日期:2025-03-17
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  • 在线发布日期: 2025-09-05
  • 出版日期: 2025-08-15