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How do long summer days support photosynthesis in Arctic tundra plants?

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tundra biome — Polar ecosystem Southern limit of Arctic tundra and approximate line of demarcation between Low and High Arctic.

In the Arctic tundra, the continuous or nearly continuous daylight during the brief summer season is a critical driver of biological activity. This period of constant sunlight allows for the rapid growth of vascular plants, which forms the foundation for the region's biological productivity.1

Because the Arctic summer is short, plants must maximize their energy intake during this window. The persistent light enables these plants to sustain photosynthesis for extended periods without the interruption of a daily dark cycle, which typically governs biological rhythms in temperate or tropical regions. This intense, uninterrupted exposure to solar radiation supports the rapid development of vegetation, which is essential for the survival of local herbivores like caribou and geese. Additionally, the removal of annual vegetative growth by grazing animals can further support this cycle by exposing new plant growth to direct sunlight and promoting soil heating, which helps accelerate nutrient recycling.21