| 季前气候与地形对云贵高原植被物候变化的调控机制 |
| 摘要点击 230 全文点击 3 投稿时间：2025-04-09 修订日期：2025-07-21 |
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| 中文关键词 日光诱导叶绿素荧光（SIF） 植被物候 结构方程模型（SEM） 季前气候 地形调控 |
| 英文关键词 solar-induced chlorophyll fluorescence （SIF） vegetation phenology structural equation modeling （SEM） pre-seasonal climate terrain control |
| DOI 10.13227/j.hjkx.202504110 |
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| 中文摘要 |
| 植被物候变化作为陆地生态系统响应外界环境变化的重要表征，对生态环境评估和生物多样性保护具有重要意义. 但季前气候与地形对植被物候的调控机制尚未充分阐明，尤其是在高海拔复杂地形区域. 基于SIF数据，采用Savitzky-Golay滤波重建云贵高原2001~2023年SIF时间序列，利用动态阈值法提取植被物候，通过偏相关分析和结构方程模型（SEM），探讨气候变化与地形对植被物候变化的调控机制. 结果表明：①云贵高原地区SOS主要集中在第80~100 d，呈提前趋势；EOS集中在第300~340 d，呈延迟趋势；LOS平均为218 d，呈延长趋势；随着地势自东向西升高，SOS逐渐推迟，EOS提前，LOS相应缩短；②季前气候因子对植被物候时滞作用显著. SOS受季前因子1~3个月时滞效应调控显著，低纬度低海拔区多为负相关，高寒高海拔区多为正相关；EOS同样受季前因子1~3个月时滞效应调控，东部和低海拔地区呈负相关，西部和高海拔地区为正相关；③地形通过影响温度和降水间接调控植被物候. 坡度对SOS和EOS调控作用较大，对LOS调控作用不显著；坡向对气候因子的影响较弱，导致对物候的调控作用有限；海拔通过影响温度和降水显著调控EOS和LOS. |
| 英文摘要 |
| The phenological changes of vegetation， as an important representation of the response of terrestrial ecosystems to external environmental changes， have significant implications for ecological environment assessment and biodiversity conservation. However， the regulatory mechanisms of pre-seasonal climate and terrain on vegetation phenology have not been fully elucidated， especially in high-altitude complex terrain areas. Based on SIF data， a Savitzky-Golay filter is used to reconstruct the SIF time series of the Yunnan-Guizhou Plateau from 2001 to 2023， and the vegetation phenology is extracted using the dynamic threshold method. Through partial correlation analysis and structural equation modeling （SEM）， the regulation mechanism of climate change and terrain on vegetation phenology change is discussed. The results showed that： ①SOS in the Yunnan-Guizhou Plateau was mainly concentrated in the 80th to 100th days， showing an early trend； EOS was concentrated between the 300th and 340th days， showing a delayed trend； and the average LOS was 218 days， showing a trend of extension. As the terrain rose from east to west， SOS gradually delayed， EOS advanced， and LOS correspondingly shortened. ② Pre-seasonal climate factors had a significant effect on vegetation phenological delay. SOS was significantly regulated by the 1-3 month lag effect of pre-season factors， with negative correlations in low latitude and low altitude areas and positive correlations in high-altitude and high-altitude areas. EOS was also regulated by the 1-3 month lag effect of pre-season factors， with a negative correlation between the eastern and low altitude regions and a positive correlation between the western and high-altitude regions. ③ Terrain indirectly regulated vegetation phenology by influencing temperature and precipitation. Slope had a significant regulatory effect on SOS and EOS but not on LOS. The influence of slope orientation on climate factors was weak， resulting in limited regulation of phenology. Altitude significantly regulated EOS and LOS by influencing temperature and precipitation. |
