Carbon uptake and tree growth are important factors for assessing productivity and long-term carbon storage. Measurements of radial stem growth are mainly performed at the individual tree scale and can be used to infer ecosystem net primary productivity (NPP). However, these measurements are spatially limited, and remote sensing provides a promising tool to track vegetation function and productivity across spatial scales, making it a viable technique for assessing variation in interannual tree growth and carbon storage. In this study we examined the correspondence between in-situ annual tree-ring width across four dominant evergreen species in the Sierra Nevada and a wide range of remotely sensed products linked to carbon uptake including NPP, gross primary productivity (GPP), net photosynthesis (PSN), normalized difference vegetation index (NDVI), near infrared reflectance of vegetation index (NIR_V), and chlorophyll/carotenoid index (CCI) from MODIS (Moderate resolution Imaging Spectroradiometer) as well as downscaled solar-induced fluorescence (SIF) products, using a 14 year dataset (2000–2014) across 62 forest sites. We show that variation of annual tree-ring width was best captured by the annual sum of MODIS GPP, with a legacy effect (5-month backwards shift). Across all forest sites, MODIS GPP with a 5-month legacy effect showed moderate correspondence with tree-ring width (r = 0.60). Within each individual site, however, the interannual correspondence between MODIS GPP with a legacy effect and tree growth was stronger (median r = 0.70 vs 0.14 without a legacy effect). The importance of legacy effects in explaining tree growth variation within sites indicates that tree growth each year is influenced by carbon uptake during the latter part of the previous growing season. Additional local environmental factors also explained annual variation in tree-ring width, including (in descending order of importance) local tree density, latitude, slope, DBH, elevation and aspect.

碳吸收和树木生长是评估生产力和长期碳储存的重要因素。径向茎生长的测量主要在单个树的尺度上进行，可用于推断生态系统的净初级生产力 (NPP)。然而，这些测量在空间上是有限的，而遥感提供了一种很有前途的工具来跟踪跨空间尺度的植被功能和生产力，使其成为评估年际树木生长和碳储存变化的可行技术。在这项研究中，我们检查了内华达山脉四种主要常绿树种的原位年轮宽度与与碳吸收相关的广泛遥感产品之间的对应关系，包括 NPP、总初级生产力 (GPP)、净光合作用。 PSN), 归一化差异植被指数 (NDVI),_V）和来自 MODIS（中分辨率成像光谱仪）的叶绿素/类胡萝卜素指数（CCI）以及缩小的太阳诱导荧光（SIF）产品，使用 14 年数据集（2000-2014）跨越 62 个森林站点。我们表明，年度树木年轮宽度的变化最好由 MODIS GPP 的年度总和捕获，具有遗留效应（5 个月后移）。在所有森林站点中，具有 5 个月遗留效应的 MODIS GPP 显示出与年轮宽度的适度对应 ( r  = 0.60)。然而，在每个单独的站点内，具有遗留效应的 MODIS GPP 与树木生长之间的年际对应关系更强（中值r = 0.70 vs 0.14 没有遗留效应）。遗产效应在解释场地内树木生长变化方面的重要性表明，每年树木的生长都受到前一个生长季节后期碳吸收的影响。其他当地环境因素也解释了年轮宽度的年度变化，包括（按重要性降序）当地树木密度、纬度、坡度、胸径、海拔和坡向。