Kiona Ogle<\/strong>, who recently moved to NAU from Arizona State University, also contributed to the design and analysis of the study.<\/p>\n\u201cWhat we\u2019ve found is that recovery takes a while,\u201d Koch said. \u201cFor most forested ecosystems, growth following a dry year is slower than expected.\u201d Now Schwalm will help other modeling groups build this nuanced reality into better models, Koch said.<\/p>\n
Koch, meanwhile, will conduct research to \u201cunderstand more of the mechanistic basis of this legacy effect of drought.\u201d He and collaborators will use data they\u2019ve collected over dozens of areas in the Four Corners region.<\/p>\n
\u201cWe can define drought and study its impacts to trees in more detail when looking at specific regional sites,\u201d Koch said. \u201cThis may help us understand why some trees survive while others die. And it will improve predictions of the impacts of future droughts on forest carbon sequestration.\u201d<\/p>\n
The implications of the global study relate to climate change and the anticipated increase in drought frequency and duration.<\/p>\n
Forest trees play a big role in buffering the impact of human-induced climate change by removing massive amounts of carbon dioxide emissions from the atmosphere and incorporating the carbon into woody tissues. The finding that drought stress sets back tree growth for years suggests that Earth\u2019s forests are capable of storing less carbon than climate models have calculated.<\/p>\n
Lead author William R.L. Anderegg at the University of Utah led a team that carefully measured the recovery of tree stem growth after severe droughts since 1948 at more than 1,300 forest sites around the earth using records from the International Tree Ring Data Bank. Tree rings provide a convenient history of wood growth and track carbon uptake of the ecosystem in which the tree grew.<\/p>\n
The researchers found that a few forests showed positive effects, that is, observed growth was higher than predicted after drought, most prominently in parts of California and the Mediterranean region. But in the majority of the world\u2019s forests, trees struggled for years after experiencing drought.<\/p>\n
On average, trunk growth took 2 to 4 years to return to normal. Growth was about 9 percent slower than expected during the first year of recovery, and remained 5 percent slower in the second year. Long-lasting effects of drought were most prevalent in dry ecosystems, and among pines and tree species with low hydraulic safety margins.<\/p>\n","protected":false},"excerpt":{"rendered":"
In forests around the world, drought leaves a legacy that endures even after the rains return. Three Northern Arizona University researchers contributed to a study published this week in Science that showed surviving trees took an average of two to four years to recover and resume normal growth rates after droughts ended. The finding runs…<\/a><\/p>\n","protected":false},"author":46,"featured_media":38089,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[997,11],"tags":[474,253,1012,1015,1013,1014,38,24],"class_list":["post-38090","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-homepage","category-research-academics","tag-christopher-schwalm","tag-climate-change","tag-drought","tag-forest-health","tag-george-koch","tag-kiona-ogle","tag-nau","tag-northern-arizona-university"],"acf":[],"_links":{"self":[{"href":"https:\/\/in.nau.edu\/news\/wp-json\/wp\/v2\/posts\/38090","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/in.nau.edu\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/in.nau.edu\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/in.nau.edu\/news\/wp-json\/wp\/v2\/users\/46"}],"replies":[{"embeddable":true,"href":"https:\/\/in.nau.edu\/news\/wp-json\/wp\/v2\/comments?post=38090"}],"version-history":[{"count":0,"href":"https:\/\/in.nau.edu\/news\/wp-json\/wp\/v2\/posts\/38090\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/in.nau.edu\/news\/wp-json\/wp\/v2\/media\/38089"}],"wp:attachment":[{"href":"https:\/\/in.nau.edu\/news\/wp-json\/wp\/v2\/media?parent=38090"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/in.nau.edu\/news\/wp-json\/wp\/v2\/categories?post=38090"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/in.nau.edu\/news\/wp-json\/wp\/v2\/tags?post=38090"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}