Spatiotemporal variability in primary producer growth rates is a fundamental aspect of community structure. Understanding drivers of these patterns and their response to climate variability and change are ongoing challenges. Nutrient and light limitations often are invoked as proximate drivers of these patterns, but many other environmental and biological factors vary across spatial and temporal scales. In temperate rocky intertidal habitats, macrophytes are major space occupiers and the base of the food web, and thus their patterns of primary production relate directly to their functions and services in these communities. We investigated spatiotemporal patterns of the primary production of two species of macrophytes, the kelp Hedophyllum sessile and the surfgrass Phyllospadix scouleri, across 908 km of Oregon and California coastline. Spatiotemporal variability in macrophyte growth rates and their relationships to regional or local‐scale environmental variables (upwelling, nutrients, temperature, light, phytoplankton blooms) and climate regimes were explored. Paradoxically, we found that both warmer water temperature (e.g., warm phases of climate patterns, weaker upwelling) and increased nutrients (e.g., with stronger upwelling) increased macrophyte productivity. Kelp growth decreased with dense phytoplankton blooms, while surfgrass growth decreased with increasing air temperature. Growth rates reflected tissue elemental content in surfgrass but only weakly in kelp. Hence, as climate warms and/or if upwelling intensifies, productivity of these and perhaps other macrophytes should increase, at least until thermal conditions, particularly low tide air temperature, become too stressful.

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大型植物生产力的生物地理学：跨时空尺度的海洋和气候状况的影响

初级生产者增长率的时空变化是社区结构的基本方面。理解这些模式的驱动因素及其对气候变化和变化的响应是持续的挑战。营养和光的限制常常被认为是这些模式的直接驱动力，但是许多其他环境和生物因素在空间和时间尺度上是不同的。在温带多石的潮间生境中，大型植物是主要的空间占用者和食物网的基础，因此，它们的主要生产方式直接与其在这些社区中的功能和服务有关。我们调查了两种大型水生植物海带无柄海藻和海草Phyllospadix scouleri初级生产的时空格局。横跨908公里的俄勒冈州和加利福尼亚州海岸线。研究了大型植物生长速率的时空变异性及其与区域或局部尺度环境变量（上升，营养，温度，光照，浮游植物开花）的关系以及气候状况。矛盾的是，我们发现，水温升高（例如，气候模式的暖期，上升流减弱）和养分增加（例如，上升流增强）都增加了大型植物的生产力。随着浮游植物的密集繁殖，海带的生长减少，而随着气温的升高，海草的生长减少。生长速度反映了表面草中的组织元素含量，但仅反映了海带中的组织元素含量。因此，随着气候变暖和/或上升流加剧，这些植物以及可能的其他大型植物的生产力应至少在热条件之前有所提高，