{"id":39141,"date":"2026-04-29T02:51:44","date_gmt":"2026-04-29T00:51:44","guid":{"rendered":"https:\/\/www.co2news.sk\/?p=39141"},"modified":"2026-04-29T02:52:45","modified_gmt":"2026-04-29T00:52:45","slug":"the-invisible-threat-beneath-our-feet-as-long-term-warming-releases-even-the-most-resilient-carbon-from-forest-floors","status":"publish","type":"post","link":"https:\/\/www.co2news.sk\/en\/2026\/04\/29\/the-invisible-threat-beneath-our-feet-as-long-term-warming-releases-even-the-most-resilient-carbon-from-forest-floors\/","title":{"rendered":"The invisible threat beneath our feet: How long-term warming is releasing even the most resilient carbon from forest soils"},"content":{"rendered":"

Forests are often referred to as the lungs of our planet, but their greatest climate treasure is hidden where we don't usually see it - underground.. Forest soils are key reservoirs in the global carbon cycle, storing up to 47 % of total carbon in temperate regions alone, surpassing the stocks stored in both above-ground vegetation and the atmosphere.<\/strong>. This soil organic matter (SOM) thus serves as a critical buffer against climate change and maintains soil fertility. However, rising global temperatures are fundamentally disrupting this delicate balance.<\/p>\n

The longest experiment of its kind<\/strong><\/p>\n

To understand exactly what happens to soil as temperatures continue to rise, scientists used data from the longest-running experiment<\/span><\/a> with global soil warming. At Prospect Hill in the famous Harvard Forest in Massachusetts, dominated by trees such as red oak, paper birch and red maple, the soil has been artificially and continuously heated since 1991. Using underground resistance cables, the soil temperature is constantly maintained at 5 \u00b0C above the normal ambient temperature. This unique 32-year experiment has provided researchers with a space to examine the impact of chronic heat on the long-term dynamics of soil organic matter.<\/p>\n

The myth of indestructible carbon<\/strong><\/p>\n

Natural organic matter in soil consists of a variety of compounds derived from dead plants and microbes. It has long been thought that certain chemicals, particularly root-derived carbon (called suberin) and plant waxes, are particularly resistant to microbial degradation. These include long-chain aliphatic lipids known as n-alkanes<\/em>. Because of their chemical structure and hydrophobic nature, they are difficult for microorganisms to digest, which has led them to be considered a stable store of carbon in the soil. Many current climate predictions rely on this carbon remaining permanently locked up in the soil, curbing global warming.<\/p>\n

Shocking findings after 32 years of warming<\/strong><\/p>\n

However, after three decades of chronic heat, a finding has emerged that refutes these assumptions. Long-term warming has significantly accelerated the degradation of previously resistant forms of organic matter<\/strong>. Measurements showed that in the heated mineral soil layer, the concentrations of these stable, long-chain n-alkanes (especially those directly associated with plant roots) decreased by more than 50 % compared to the control, unheated areas. The compounds that should have persisted in the soil the longest thus surprisingly became vulnerable and gradually disappeared.<\/p>\n

Microbes have changed their "diet"\u201e<\/strong><\/p>\n

The main players in this unexpected disappearance of stable carbon are soil microorganisms. At the beginning of warming, soil microbes very quickly decomposed and consumed available and easily digestible carbon, such as cellulose. As preferred food sources decreased over time, microbes had to adapt. They underwent a fundamental restructuring in their resource use: they began to focus on the degradation of chemically more complex, more persistent compounds, such as n-alkanes, which they would not normally attack<\/strong>.<\/p>\n

Evidence for this metabolic change is the observed molecular chain. In the aerobic decomposition of n-alkanes, bacteria use specific enzymes to oxidize the terminal methyl variant, forming alcohols (n-alkanols<\/em>). In the heated layer, the scientists noted a significant increase in these intermediate decomposition products. Interestingly, despite the change to a more difficult-to-access food source, specific indicators in the microbial cell membranes (lipid ratios) did not indicate that the microorganisms were under increased stress. They successfully and without harm acclimatized their functioning to the new conditions.<\/p>\n

Different behavior of different soil layers<\/strong> However, it is necessary to add that the changes differ at different soil depths. While in the deeper, mineral layer (up to 10 cm) there was intensive decomposition of stable carbon from the roots, on the surface itself (in the forest litter layer) the situation looked a little different. Increased temperature stimulated trees to produce more fallen leaves, thus providing the surface layer with a new supply from plant sources, which partially masked the overall loss of soil mass.<\/strong>. However, in mineral soil, where long-term storage of stable carbon protected by minerals was assumed, its alarming decline was confirmed.<\/p>\n

A crucial message for future climate models<\/strong><\/p>\n

The implications of this study are alarming. The research clearly shows that the stability of organic matter in soil is not guaranteed only by its internal chemical composition, but depends primarily on environmental conditions and the current capacity of microbes to decompose it. If climate change can force microbes to break down and release even the most stable carbon stocks from roots into the atmosphere, many current climate models are likely overestimating the ability of soil to act as a long-term sink for emissions.<\/strong>. Accurate models will now have to take into account that in a warming world, even seemingly "indestructible" carbon is not safe from starving microbes. JRi&CO2AI\u00a0<\/strong><\/em><\/p>","protected":false},"excerpt":{"rendered":"

Forests are often referred to as the lungs of our planet, but their greatest climate treasure is hidden where we don't usually see it - underground.<\/p>","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-39141","post","type-post","status-publish","format-standard","hentry","category-klimaticka-zmena"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.co2news.sk\/en\/wp-json\/wp\/v2\/posts\/39141","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.co2news.sk\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.co2news.sk\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.co2news.sk\/en\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/www.co2news.sk\/en\/wp-json\/wp\/v2\/comments?post=39141"}],"version-history":[{"count":3,"href":"https:\/\/www.co2news.sk\/en\/wp-json\/wp\/v2\/posts\/39141\/revisions"}],"predecessor-version":[{"id":39144,"href":"https:\/\/www.co2news.sk\/en\/wp-json\/wp\/v2\/posts\/39141\/revisions\/39144"}],"wp:attachment":[{"href":"https:\/\/www.co2news.sk\/en\/wp-json\/wp\/v2\/media?parent=39141"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.co2news.sk\/en\/wp-json\/wp\/v2\/categories?post=39141"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.co2news.sk\/en\/wp-json\/wp\/v2\/tags?post=39141"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}