{"id":39321,"date":"2025-05-16T11:00:27","date_gmt":"2025-05-16T09:00:27","guid":{"rendered":"https:\/\/resoilfoundation.org\/?p=39321"},"modified":"2025-05-22T17:22:58","modified_gmt":"2025-05-22T15:22:58","slug":"drought-heat-carbon-sequestration","status":"publish","type":"post","link":"https:\/\/resoilfoundation.org\/en\/environment\/drought-heat-carbon-sequestration\/","title":{"rendered":"Drought and extreme heat reduce carbon sequestration capacity in plants"},"content":{"rendered":"<h2>Plant respiration and decomposition of organic matter increase carbon emissions offsetting additional sequestration associated with extended growing season, a study by the Autonomous University of Barcelona finds<\/h2>\n<p style=\"text-align: center;\">by Matteo Cavallito<\/p>\n<p>&nbsp;<\/p>\n<p>The increase in extreme weather events caused by climate change alters the balance in the <strong>Earth&#8217;s carbon cycle<\/strong> and affects vegetation development. This is shown, in particular, by the 2022 heat wave that reduced the total storage capacity of the element by plants by more than a quarter. This is stated in a <a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/10.1029\/2024GB008163\" target=\"_blank\" rel=\"noopener\">research<\/a> published in the journal Global Biogeochemical Cycles.<\/p>\n<p>Rising temperatures, the authors point out, extended the growing season of plant species by initially increasing carbon uptake. This effect, however, <strong>was subsequently offset<\/strong> by a simultaneous increase in CO\u2082 release from decomposition of organic matter and plant respiration.<\/p>\n<div class='avia-iframe-wrap'>\n<blockquote class=\"wp-embedded-content\" data-secret=\"VoTYg1XLLJ\"><p><a href=\"https:\/\/resoilfoundation.org\/en\/articles\/heat-drought-carbon-forest\/\">Heat and drought drive carbon loss in tropical forests<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&#8220;Heat and drought drive carbon loss in tropical forests&#8221; &#8212; Re Soil Foundation\" src=\"https:\/\/resoilfoundation.org\/en\/articles\/heat-drought-carbon-forest\/embed\/#?secret=SXg6Hs6cus#?secret=VoTYg1XLLJ\" data-secret=\"VoTYg1XLLJ\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/div>\n<h5>Southwestern Europe is particularly vulnerable<\/h5>\n<p>\u201cHeat and drought events are increasing in frequency and intensity, posing significant risks to natural and agricultural ecosystems with uncertain effects on the <strong>net ecosystem CO2 exchange<\/strong>,\u201d explains the study conducted by the <a href=\"https:\/\/www.uab.cat\/web\/sala-de-premsa-icta-uab\/detall-noticia\/droughts-and-heatwaves-reduce-plants-ability-to-absorb-co2-1345819915004.html?detid=1345952637410\" target=\"_blank\" rel=\"noopener\">Autonomous University of Barcelona<\/a>. To understand the impact of these events, the researchers developed a model to analyze <a href=\"https:\/\/resoilfoundation.org\/en\/agricultural-industry\/light-photoreceptor-plant-growth\/\" target=\"_blank\" rel=\"noopener\">photosynthesis<\/a> and vegetation respiration taking into account the effects of soil moisture.<\/p>\n<blockquote><p>The authors also used <strong>satellite data on solar-induced fluorescence<\/strong>, a reliable indicator of photosynthetic activity, to validate the models by confirming how <strong>carbon exchange<\/strong> between ecosystems and the atmosphere is highly sensitive to extreme events.<\/p><\/blockquote>\n<p>The study results show that the water balance and timing of extreme events are critical to understanding ecosystem responses. Some regions such as <strong>southwestern Europe<\/strong>, which include various climate types, appear particularly vulnerable to these changes, according to the authors.<\/p>\n<div id=\"attachment_39310\" style=\"width: 2138px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-39310\" class=\"size-full wp-image-39310\" src=\"https:\/\/resoilfoundation.org\/wp-content\/uploads\/2025\/05\/area-studio.jpg\" alt=\"La ricerca ha analizzato i flussi di carbonio nello spazio di un ventennio (2001-22) in Portogallo, Spagna, Italia e sud della Francia. Immagine: R. Segura-Barrero et al. \u201cHeat and Drought Events Alter Biogenic Capacity to Balance CO2 Budget in South-Western Europe\u201d, Global Biogeochemical Cycles, Volume39, Issue1 January 2025 e2024GB008163 https:\/\/doi.org\/10.1029\/2024GB008163 Attribution-NonCommercial-NoDerivatives 4.0 International CC BY-NC-ND 4.0 Deed\" width=\"2128\" height=\"1294\" srcset=\"https:\/\/resoilfoundation.org\/wp-content\/uploads\/2025\/05\/area-studio.jpg 2128w, https:\/\/resoilfoundation.org\/wp-content\/uploads\/2025\/05\/area-studio-300x182.jpg 300w, https:\/\/resoilfoundation.org\/wp-content\/uploads\/2025\/05\/area-studio-1030x626.jpg 1030w, https:\/\/resoilfoundation.org\/wp-content\/uploads\/2025\/05\/area-studio-768x467.jpg 768w, https:\/\/resoilfoundation.org\/wp-content\/uploads\/2025\/05\/area-studio-1536x934.jpg 1536w, https:\/\/resoilfoundation.org\/wp-content\/uploads\/2025\/05\/area-studio-2048x1245.jpg 2048w, https:\/\/resoilfoundation.org\/wp-content\/uploads\/2025\/05\/area-studio-1500x912.jpg 1500w, https:\/\/resoilfoundation.org\/wp-content\/uploads\/2025\/05\/area-studio-705x429.jpg 705w\" sizes=\"auto, (max-width: 2128px) 100vw, 2128px\" \/><p id=\"caption-attachment-39310\" class=\"wp-caption-text\">The research analyzed carbon fluxes over two decades (2001-22) in Portugal, Spain, Italy and southern France. Image: R. Segura-Barrero et al. \u201c<a href=\"https:\/\/doi.org\/10.1029\/2024GB008163\" target=\"_blank\" rel=\"noopener\">Heat and Drought Events Alter Biogenic Capacity to Balance CO2 Budget in South-Western Europe<\/a>\u201d, Global Biogeochemical Cycles, Volume39, Issue1 January 2025 e2024GB008163 Attribution-NonCommercial-NoDerivatives 4.0 International CC BY-NC-ND 4.0 Deed<\/p><\/div>\n<h5>Extreme events reduce sink capacity by a quarter<\/h5>\n<p>The research analyzed carbon fluxes over the space of a 20-year period (2001-22) in <strong>Portugal, Spain, Italy and southern France<\/strong>. Data from 10 biogeographic regions showed that ecosystems in continental and humid climates are more affected by heat waves and droughts than those in Mediterranean areas. Which, in fact, seems to better adapt to these events. Overall, current warming and drying trends could cause imbalances between photosynthesis and respiration. Thus compromising the role of ecosystems in carbon sequestration.<\/p>\n<blockquote><p>In this scenario, extreme events such as the 2022 heat wave, for example, caused <strong>a reduction in uptake of more than 26 percent<\/strong>, temporarily reversing the role of ecosystems from \u201csequesters\u201d to sources of net CO\u2082 emissions.<\/p><\/blockquote>\n<p>In the two decades under review, hot and dry periods reduced photosynthesis to a greater extent than respiration resulting in a <strong>decrease in net uptake<\/strong>. Positive spring anomalies did not compensate for summer losses. All this confirms the vulnerability of the carbon budget to extreme events. With direct implications for the role of ecosystems in mitigating climate change.<\/p>\n<div class='avia-iframe-wrap'>\n<blockquote class=\"wp-embedded-content\" data-secret=\"YoAsIEjTTO\"><p><a href=\"https:\/\/resoilfoundation.org\/en\/articles\/ultrasound-device-drought-plant\/\">Ultrasound device measures the impact of drought on plants<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&#8220;Ultrasound device measures the impact of drought on plants&#8221; &#8212; Re Soil Foundation\" src=\"https:\/\/resoilfoundation.org\/en\/articles\/ultrasound-device-drought-plant\/embed\/#?secret=ZpCG45GvPQ#?secret=YoAsIEjTTO\" data-secret=\"YoAsIEjTTO\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/div>\n<h5>Improving monitoring of carbon fluxes<\/h5>\n<p>The results, the authors conclude, \u201chighlight the vulnerability of the south-western Europe&#8217;s carbon sink capacity to potential shifts in climate change, especially more frequent and intense droughts.\u201d In light of the observed imbalance, the researchers therefore stress the need to <strong>improve monitoring of carbon fluxes<\/strong> expecially in vulnerable areas. And to strengthen policies for adaptation and protection of crucial ecosystems.<\/p>\n<blockquote><p>\u201cWater balance plays a more important role in the interannual anomalies of the gross ecosystem exchange and r<strong>espiration during the growing season<\/strong> in the semi-arid Iberian and Tyrrhenian-Adriatic <a href=\"https:\/\/en.wikipedia.org\/wiki\/Sclerophyll\" target=\"_blank\" rel=\"noopener\">sclerophyllous<\/a> regions,\u201d the study continues.<\/p><\/blockquote>\n<p>However, \u201cthis analysis reveals a higher drought influence on gross ecosystem exchange anomalies than on ecosystem respiration anomalies in temperate humid regions such as the Atlantic, Western Europe, and the Po Basin.\u201d Thus, the researchers stress the importance of studying the combined impact of heat and drought events on photosynthesis, ecosystem respiration. And, ultimately, on the Earth&#8217;s carbon budget.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Plant respiration and decomposition of organic matter increase carbon emissions offsetting additional sequestration associated with extended growing season, a study by the Autonomous University of Barcelona finds<\/p>\n","protected":false},"author":4,"featured_media":39325,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[144,134],"tags":[220,187,222,229,204,237,188,322],"class_list":["post-39321","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-environment","category-articles","tag-carbon","tag-climate","tag-desertification","tag-drought","tag-ecosystems","tag-organic-matter","tag-research","tag-suolo-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Drought 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