黄河流域植被光合动态时空演变及归因分析——基于日光诱导叶绿素荧光数据

Temporal and attribution analysis of vegetation photosynthesis dynamics in the Yellow River Basin based on satellite-derived SIF

植被光合作用是维持区域生态平衡和气候稳定的关键过程之一,对了解区域生态系统的健康状况和应对气候变化具有重要意义。基于GOSIF数据,对2001—2021年黄河流域植被光合的时空变化规律及原因进行了分析。结果表明:(1)黄河流域植被光合总体呈上升趋势,在空间上表现为西部和东南部高、北部低的分布格局。其中关中平原、阿尼玛卿山、宁夏平原以及黄河三角洲地区的植被光合呈现出显著退化的趋势。(2)归因分析结果表明,不同气候要素对植被光合动态的影响具有显著差异,总体上降水和太阳辐射与黄河流域的植被光合动态呈现出正相关,而温度与植被光合动态呈现出负相关。气候变化和人类活动对黄河流域植被光合动态具有不同程度的影响。人类活动(76.24%)对植被改善区域的贡献远大于气候变化(23.76%)。在退化区域中,稀树草原和农田中的气候变化贡献大于人类活动,灌木、草地和湿地中的人类活动贡献大于气候变化,林地中的气候变化贡献与人类活动相当。研究结果有助于更好理解黄河流域植被光合作用的变化机制,为黄河流域生态保护和高质量发展以及气候变化研究提供了重要的参考依据。

Vegetation photosynthesis plays a crucial role in maintaining regional ecological balance and climate stability,holding significant implications for understanding the health of regional ecosystems and addressing climate change.This study utilized GOSIF data to analyze the spatio-temporal patterns and underlying causes of vegetation photosynthesis in the Yellow River Basin from 2001 to 2021.The results indicate that:(1) Overall,vegetation photosynthesis in the Yellow River Basin exhibits an increasing trend,with a spatial distribution characterized by higher values in the west and southeast,and lower values in the north.However,regions such as the Guanzhong Plain,the Amne Machin Mountains,the Ningxia Plain,and the Yellow River Delta show a notable degradation in vegetation photosynthesis.(2) Attribution analysis reveals significant variations in the impact of different climate factors on vegetation photosynthetic dynamics.Precipitation and solar radiation are positively correlated with vegetation photosynthetic dynamics in the Yellow River Basin,while temperature shows a negative correlation.Climate change and human activities exert varying degrees of influence on vegetation photosynthetic dynamics in the Yellow River Basin,with human activities contributing significantly more(76.24%) than climate change(23.76%).In the degraded areas,climate change plays a greater role in the contributions to vegetation dynamics in sparse grasslands and farmland,while human activities contribute more in shrublands,grasslands,and wetlands.In forest areas,the contributions of climate change and human activities are relatively equal.The findings of the study contribute to a better understanding of the mechanisms driving changes in vegetation photosynthesis in the Yellow River Basin,providing important references for ecological conservation,sustainable development,and climate change research in the region.