{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,21]],"date-time":"2026-10-21T20:12:55Z","timestamp":1792613575899,"version":"4.5.0"},"reference-count":44,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2025,4,20]],"date-time":"2025-04-20T00:00:00Z","timestamp":1745107200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2025,4,20]],"date-time":"2025-04-20T00:00:00Z","timestamp":1745107200000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["nph.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["New Phytologist"],"published-print":{"date-parts":[[2025,6]]},"abstract":"<jats:title>Summary<\/jats:title>\n                  <jats:p>\n                    A synthesis of free\u2010air CO\n                    <jats:sub>2<\/jats:sub>\n                    enrichment (FACE) experiments describing the response of forest net primary productivity (NPP) to elevated atmospheric CO\n                    <jats:sub>2<\/jats:sub>\n                    published in 2005 has provided a valuable benchmark for ecosystem models used to address the impact of future atmospheric CO\n                    <jats:sub>2<\/jats:sub>\n                    levels on forest productivity and the feedback to the atmosphere and climate change. However, that analysis was limited to young, temperate zone tree plantations, and its applicability to other biomes can be questioned. Now, after 20\u2009years, this new analysis includes two sites in much older, mature forests and expanded and updated analyses from the original sites. The original conclusion from 2005 remains valid with only a minor modification. After normalizing to a common CO\n                    <jats:sub>2<\/jats:sub>\n                    enrichment of 41%, NPP increased 21.8% in elevated CO\n                    <jats:sub>2<\/jats:sub>\n                    across a wide range of forest productivity. The response declined with increasing mean annual temperature, but did not decline with forest age as expected. The response of wood production (18.2%) was somewhat less than that of NPP, but there was no evidence of a CO\n                    <jats:sub>2<\/jats:sub>\n                    effect on carbon allocation between long\u2010 and short\u2010term carbon pools. This analysis should inform and generate testable hypotheses for new FACE experiments such as the AmazonFACE experiment in a tropical forest.\n                  <\/jats:p>","DOI":"10.1111\/nph.70162","type":"journal-article","created":{"date-parts":[[2025,4,21]],"date-time":"2025-04-21T01:58:01Z","timestamp":1745200681000},"page":"1952-1959","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Forest productivity response to elevated\n                    <scp>CO<\/scp>\n                    <sub>2<\/sub>\n                    in\u00a0free\u2010air\n                    <scp>CO<\/scp>\n                    <sub>2<\/sub>\n                    enrichment experiments: the 23\u00a0percent solution, revisited"],"prefix":"10.1111","volume":"246","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0238-9828","authenticated-orcid":false,"given":"Richard J.","family":"Norby","sequence":"first","affiliation":[{"name":"Environmental Sciences Division Oak Ridge National Laboratory  Oak Ridge TN 37830 USA"},{"name":"Ecology and Evolutionary Biology University of Tennessee  Knoxville TN 37996 USA"},{"name":"Birmingham Institute of Forest Research University of Birmingham  Edgbaston B15 2TT UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,4,20]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1469-8137.2004.01224.x"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/B978-012505295-5\/50022-7"},{"key":"e_1_2_11_4_1","first-page":"86","volume-title":"Carbon and the biosphere. 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