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Spatial variations in the response of spring onset of photosynthesis of evergreen vegetation to climate factors across the Tibetan Plateau: The roles of interactions between temperature, precipitation, and solar radiation
Agricultural and Forest Meteorology ( IF 5.6 ) Pub Date : 2023-04-07 , DOI: 10.1016/j.agrformet.2023.109440
Lihao Zhang , Miaogen Shen , Nan Jiang , Jinxia Lv , Licong Liu , Lei Zhang

Phenological changes of evergreen vegetation affect ecosystem functions and land-atmosphere exchanges. Although recent studies have documented changes in the spring onset of photosynthesis derived from satellite solar-induced chlorophyll fluorescence (SOSSIF) of evergreen vegetation in the Northern Hemisphere, spatial variations in the response of the onset of spring photosynthesis to climate change remain poorly characterized. Using a continuous solar-induced chlorophyll fluorescence dataset, we found that SOSSIF advanced in more than 70.0% of surveyed areas with evergreen vegetation, represented as pixels and spread widely across the Tibetan Plateau. Warming temperatures contributed to advanced SOSSIF in more than 42.0% of surveyed areas, mainly in the southeast and areas between 90 and 97 °E. Increasing precipitation contributed to advanced SOSSIF in about 15.0% of surveyed areas, mainly along the southeastern edge of the plateau. A negative partial correlation between SOSSIF and temperature (RP(SOSSIF,T)) was observed in more than 65.0% of surveyed areas, and stronger negative RP(SOSSIF,T) was found in areas with a larger positive interannual correlation between preseason temperature and precipitation, likely due to the better match between favorable temperature and water conditions in these areas. The positive RP(SOSSIF,T) was likely associated with low water availability. The partial correlation between SOSSIF and precipitation (RP(SOSSIF,P)) was spatially diverse, with negative RP(SOSSIF,P) in about half of surveyed areas. Stronger negative RP(SOSSIF,P) was observed in areas with a stronger negative interannual correlation between preseason precipitation and solar radiation, which was probably caused by the trade-off between water and light availability to maximize the benefits from precipitation. The positive RP(SOSSIF,P) was likely due to the lack of solar radiation. This study provides new explanations for spatial variations in the response of SOSSIF to temperature and precipitation, contributing to assessments of vegetation phenology and global carbon cycle modeling.



中文翻译:

青藏高原春季常绿植被光合作用对气候因素响应的空间变化:温度、降水和太阳辐射之间相互作用的作用

常绿植被的物候变化影响生态系统功能和陆气交换。尽管最近的研究记录了北半球常绿植被的卫星太阳诱导叶绿素荧光 (SOS SIF ) 引起的春季光合作用开始的变化,但春季光合作用开始对气候变化的响应的空间变化特征仍然很差。使用连续的太阳诱导叶绿素荧光数据集,我们发现 SOS SIF在超过 70.0% 的常绿植被调查区域中取得进展,以像素表示并在青藏高原广泛传播。气温升高导致高级 SOS SIF超过 42.0% 的调查区域,主要分布在东南部和 90 至 97 °E 之间的区域。在大约 15.0% 的调查区域中,降水增加导致 SOS SIF提前,主要是沿着高原的东南边缘。SOS SIF与温度呈负偏相关关系(RP(所以小号SIF,))在超过 65.0% 的调查区域中被观察到,并且负面影响更强RP(所以小号SIF,)在季前温度和降水之间存在较大正相关的地区被发现,这可能是由于这些地区有利的温度和水条件之间更好的匹配。积极的RP(所以小号SIF,)可能与可用水量低有关。SOS SIF与降水偏相关(RP(所以小号SIF,P)) 在空间上是多样化的,负RP(所以小号SIF,P)在大约一半的调查区域。更强的消极RP(所以小号SIF,P)在季前降水和太阳辐射之间的年际负相关性更强的地区观察到,这可能是由于水和光照可用性之间的权衡,以最大限度地利用降水带来的好处。积极的RP(所以小号SIF,P)可能是由于缺乏太阳辐射。这项研究为 SOS SIF对温度和降水响应的空间变化提供了新的解释,有助于评估植被物候和全球碳循环建模。

更新日期:2023-04-08
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