树环和NDVI沿着环境梯度的气候反应的转移
Jiří Mašek1, Jan Tumajer1, Jelena Lange1
1Department of Physical Geography and Geoecology, Faculty of Science, Charles University, Albertov 6, 128 43 Prague, Czech Republic.
The Science of the total environment
|November 3, 2023
概括
挪威杉 (Picea abies) 的茎和叶子对气候有不同的反应. 随着湿度的增加,茎的生长从正向负转变,而树叶的绿色随着温度升高而持续下降,影响森林碳循环.
科学领域:
- 森林生态 森林生态
- 气候变化影响气候变化的影响.
- 生态系统的碳循环循环.
背景情况:
- 森林生态系统中的地面生物质变化,特别是树干和树叶,对碳循环至关重要.
- 了解这些生物质部分的气候驱动反应及其影响因素是必不可少的,但仍然有限.
研究的目的:
- 为了研究挪威杉 (Picea abies) 在中欧温带森林的各种环境梯度中对气候反应的干部生长和叶子活力.
- 确定干旱度,土壤类型,位年龄和地形等因素如何调节这些气候增长关系.
主要方法:
- 利用树环时间表来评估每年茎生物质增长率.
- 采用Landsat图像的规范差异植被指数 (NDVI) 的时间序列,用于季节性树冠活力.
- 相关的树环宽度和NDVI与生长季节的温度和标准化降水蒸发指数 (SPEI).
主要成果:
- 树环对SPEI和温度的反应分别从正变为负,负变为正,沿着一个干到湿的梯度.
- 在所有梯度上,NDVI始终表现出对温度的负面反应,这归因于温暖地区的干旱和潮湿地区的云层.
- 树环的气候反应因树年龄而异,但不受地形或土壤条件的显著影响.
结论:
- 在挪威杉树中,树干和树叶表现出脱的气候反应,这是由于沿着环境梯度的不同限制所驱动的.
- 这种脱表明,树冠活力趋势可能与正在进行的气候变化下的温带森林的茎生长趋势有所不同,这对碳封存估计有影响.
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