阿尔卑斯山植被功能对西藏高原气候变化的反应:从太阳引起的叶绿素光的角度来看
Yiwen Luo1, Ning Ma2, Yongqiang Zhang2
1Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China; School of Geography, South China Normal University, Guangzhou, China.
The Science of the total environment
|August 29, 2024
概括
西藏高原的植被因温度升高而变绿,其功能和结构同时发生变化. 气温上升是这种植被变化的主要驱动因素,影响了碳吸收.
科学领域:
- 生态生态学 生态生态学
- 气候科学 气候科学
- 遥感 遥感 遥感 遥感
背景情况:
- 西藏高原 (TP) 植被变化表明高山气候变化.
- 以前的研究表明,TP的整体绿化,特别是在东北部,与变暖有关.
- 了解TP中的植被功能和驱动因素仍然有限.
研究的目的:
- 测试阿尔卑斯山植被的功能和结构在过去几十年中同步变化的假设.
- 量化东北部黄河源 (YRS) 地区植被功能和结构的长期趋势.
主要方法:
- 分析卫星观测的太阳引起的叶绿素光 (SIF) 对植被功能的分析.
- 对植被结构的叶面积指数 (LAI) 的分析.
- 多重回归方法用于识别SIF变化的气候驱动因素.
主要成果:
- 从1982年到2018年,YRS面积的77.71%显著增加了SIF,区域平均趋势为0.52 × 10−3 mW m−2 nm−1 sr−1 yr−1.1.
- SIF的增加 (16.1%) 与LAI的增加相当,表明植被功能和结构的同步变化.
- 气温上升是YRS大部分地区SIF增加的主要驱动因素,而在更干燥的北部和西部地区,降水量显著.
结论:
- 在YRS中植被绿色的改善与碳吸收的类似变化相对应.
- 气候变暖,主要是温度,正在调节这个高海拔地区的植被结构和功能.
- 这些发现对于了解气候对高山生态系统的影响至关重要.
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