{"id":2390,"date":"2026-09-30T01:28:00","date_gmt":"2026-09-29T16:28:00","guid":{"rendered":"https:\/\/onepress.co.kr\/index.php\/briefing\/2026-09-30-coast-redwood-heat-photosynthesis-en\/"},"modified":"2026-09-30T01:28:00","modified_gmt":"2026-09-29T16:28:00","slug":"2026-09-30-coast-redwood-heat-photosynthesis-en","status":"publish","type":"briefing","link":"https:\/\/onepress.co.kr\/index.php\/briefing\/2026-09-30-coast-redwood-heat-photosynthesis-en\/","title":{"rendered":"Coast redwood photosynthesis slowed above 86\u00b0F"},"content":{"rendered":"

2026-09-30 01:28 KST<\/strong><\/p>\n

Coast redwoods, the world\u2019s tallest trees, failed to cool some leaves adequately during hot conditions and slowed photosynthesis.<\/p>\n

The evidence comes from three summers in one California forest plus leaf experiments. It does not calculate when the species dies or represent every habitat.<\/p>\n

How it was measured<\/h2>\n

Researchers tracked leaf temperature and photosynthesis-related signals over three summers, including 2022 and 2024, in Mendocino County. In the laboratory they exposed leaves to temperatures up to 110\u00b0F to test whether performance declined even when carbon dioxide remained available.<\/p>\n

Would more water solve it<\/h2>\n

On days above 86\u00b0F, some leaves were almost 20\u00b0F warmer than the air. Stomata can close and restrict carbon dioxide, yet laboratory tests also found reduced photochemistry and net photosynthesis while stomata remained open. Heat stress was therefore not only a water-supply issue.<\/p>\n

\"Coast
This AI-generated image explains the topic; it is not a photograph of an actual event, observation or field site.<\/figcaption><\/figure>\n

Where the warning is strongest<\/h2>\n

Coast redwoods are adapted to cool coastal conditions averaging about 59\u00b0F. Trees at the already warmer, drier central, southern and eastern edges of the range may face greater disruption during heatwaves. The study did not directly measure long-term population loss.<\/p>\n

Questions still open<\/h2>\n

Researchers do not yet know recovery time, the accumulated effect of repeated heatwaves on growth and reproduction, or the upper temperature for survival. Long-term comparisons across sites and tree ages are needed before setting management thresholds.<\/p>\n

Primary source and independent checks<\/h2>\n

Primary source: JGR Biogeosciences \uc6d0 \ub17c\ubb38<\/a><\/p>\n

Institutional explanation: UC Davis \uc5f0\uad6c \uc124\uba85<\/a><\/p>\n

Independent check: EurekAlert \uc11c\uc9c0\u00b7\uc5f0\uad6c \ubc94\uc704 \ud655\uc778<\/a><\/p>\n

Read in other languages<\/h2>\n

\ud55c\uad6d\uc5b4<\/a> \u00b7 English<\/a> \u00b7 Espa\u00f1ol<\/a> \u00b7 \u65e5\u672c\u8a9e<\/a> \u00b7 Ti\u1ebfng Vi\u1ec7t<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Across three summers in a Mendocino forest and follow-up experiments, some redwood leaves ran nearly 20\u00b0F hotter than the air above 86\u00b0F and photosynthetic performance fell. The study did not define a mortality threshold for the whole species.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"class_list":["post-2390","briefing","type-briefing","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/briefing\/2390","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/briefing"}],"about":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/types\/briefing"}],"wp:attachment":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/media?parent=2390"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}