The observation of solar-induced chlorophyll fluorescence (SIF) signals on a spaceborne platform provides a new idea for estimating and monitoring the gross primary production (GPP) of terrestrial ecosystems at the regional scale. To improve the accuracy of remote sensing SIF signals to estimate GPP, the combination of ground tower-based continuous SIF signals with GPP to explore the mechanical connection in different ecosystems is needed. Based on continuous ground observations, the discrepancy of the links between SIF and GPP and the response to micrometeorology factors of two temperate deciduous broadleaf plantations was explored. The nonlinear relationship of SIF and GPP on the 30 min timescale transformed into a linear correlation with aggregation. With the increase in SIF, GPP gradually saturates and even declines in cork oak. We found SIF “promotion” by using intense incident radiation in cork oak and GPP “depression” or saturation in both species. GPP is more sensitive to instantaneous stresses such as intense radiation imposed high air temperature (Ta) in the midday/afternoon, and the stress threshold of cork oak is lower. We used GPP/SIF as a metric for the relationship, which is significantly higher in poplar, and found GPP/SIF of both species decrease with increasing photosynthetically active radiation (PAR). Since the difference in the amplitude of SIF between tree species was not prominent, the diversity of GPP/SIF performance was mainly caused by the divergence of GPP. The GPP/SIF of cork oak continues to decrease with increasing vapor pressure deficit (VPD), indicating that the relationship between SIF and GPP has a strong daily pattern in the constraint of micrometeorology factors. Our results show that characterizing the impact of micrometeorological conditions on the SIF-GPP relationship in a specific ecosystem is of great significance for the reliable estimation of GPP from remote sensing.

在星载平台上观测太阳诱导的叶绿素荧光 (SIF) 信号为在区域尺度上估计和监测陆地生态系统的总初级生产 (GPP) 提供了新思路。为了提高遥感 SIF 信号估计 GPP 的准确性，需要将基于地面塔的连续 SIF 信号与 GPP 相结合，探索不同生态系统中的机械联系。在连续地面观测的基础上，探讨了两种温带落叶阔叶人工林的SIF和GPP之间联系的差异以及对微气象因素的响应。SIF 和 GPP 在 30 分钟时间尺度上的非线性关系转化为与聚合的线性相关。随着 SIF 的增加，软木橡木中 GPP 逐渐饱和甚至下降。我们通过在软木橡木中使用强烈的入射辐射和在两个物种中使用 GPP“抑制”或饱和来发现 SIF“促进”。GPP对瞬时应力（例如中午/下午的高气温（Ta）强辐射）更敏感，软木橡木的应力阈值较低。我们使用 GPP/SIF 作为该关系的度量，这在杨树中显着更高，并且发现这两个物种的 GPP/SIF 随着光合有效辐射 (PAR) 的增加而降低。由于树种间SIF幅值的差异并不突出，GPP/SIF性能的差异主要是由GPP的分歧引起的。软木橡木的 GPP/SIF 随着蒸气压不足 (VPD) 的增加而继续降低，表明 SIF 和 GPP 之间的关系在微气象因素的约束下具有很强的日常模式。我们的研究结果表明，表征特定生态系统中微气象条件对SIF-GPP关系的影响对于从遥感中可靠地估计GPP具有重要意义。