Our planet\u2019s soils contain enough of the subterranean fungi that sustain plant life and help regulate the climate to stretch from the Earth to the sun almost three-quarters of a billion times, a groundbreaking new study has found.<\/p>\n
Arbuscular mycorrhizal fungi are networks of tubular cells called hyphae that sustain life on Earth by forming critical partnerships with more than 70% of plants. The networks, which have been forming for about 475 million years, provide nutrients and water in exchange for the carbon produced by the plants, and help to regulate the climate by drawing carbon into soils.<\/p>\n
And yet, despite their importance, very little is known about their distribution and density across natural ecosystems. This was one of the reasons that the Society for the Protection of Underground Networks (Spun) was set up in 2021 by a global network of scientists and researchers.<\/p>\n
Now, in a new study published in Science<\/a> and referred to as \u201cone of the most exciting of my career\u201d by one researcher, a Spun team have used machine-learning models with data from more than 16,000 soil cores from around the world to produce the first ever global map of arbuscular mycorrhizal fungi networks.<\/p>\n They calculated that the fungi networks, if stretched end to end, would reach a length of 110 quadrillion kilometres, which is almost 750m times the distance from the Earth to the sun.<\/p>\n \u201cThere could be up to 10 metres (32ft) of mycorrhizal network in just a teaspoon of soil,\u201d said Dr Justin Stewart, lead author of the study.<\/p>\n Maps showing densities of arbuscular mycorrhizal fungi in different parts of the world<\/a><\/p>\n The study also documents potential threats to this life-giving infrastructure, with the researchers finding that, on average, network densities in cropland are 47.3% lower than in wild ecosystems.<\/p>\n \u201cA lot of large-scale agriculture practices harm fungal networks,\u201d said Stewart. \u201cThe most apparent way is with something like tilling, where you go into a soil and literally rip it up.\u201d Fertilisers or fungicides can also \u201cdisrupt the symbiosis between the plants and the fungi\u201d.<\/p>\n The scientists warned that the consequences of the loss of fungal networks could be wide ranging. Lower-density fungal networks reduce the soil\u2019s ability to store carbon and distribute nutrients, and the networks also protect waterways from nitrogen, phosphorus and other chemicals.<\/p>\n \u201cIf they disappear, there\u2019s going to be a lot more chemicals going into waterways,\u201d said Dr Toby Kiers, an author of the study, who called the study one of the most exciting of her life. \u201cUltimately, the aim of the research is to help scientists and decision-makers understand where fungal systems are thriving and where they are threatened. We will be presenting these data to governments at the upcoming desertification Cop<\/a> in Mongolia in August.\u201d<\/p>\n Through their mapping, the researchers found that grasslands contained the densest hyphal systems. Regions including the Everglades in Florida, the Sudd flooded grasslands of South Sudan, and prairie and steppe ecosystems globally were all found to have \u201cexceptionally high\u201d density.<\/p>\n However, the study highlights that these regions are often poorly protected and are becoming increasingly degraded.<\/p>\n The researchers also called for closer collaboration between farmers and fungi. Stewart noted that current crop yields were artificially boosted by heavy fertiliser use. He argued that if farmers were encouraged to protect and support soil fungi, plants could obtain more nutrients naturally, reducing the need for fertilisers, while the fungi would help transfer more carbon deep into the soil, improving carbon storage.<\/p>\n Kiers said: \u201cThere\u2019s a big movement now to not only restore communities above ground, the things that you can see, the plants and animals, but also to restore underground fungal communities. And this dataset allows us to have benchmarks for what a healthy microbial community can look like.\u201d<\/p>\n The biologist and co-author Dr Merlin Sheldrake said the study helped to find \u201cways that we can better work with fungi to help address many of the unfolding challenges of our times, from food security to climate change\u201d.<\/p>\n","protected":false},"excerpt":{"rendered":"Our planet\u2019s soils contain enough of the subterranean fungi that sustain plant life and help regulate the climate…\n","protected":false},"author":2,"featured_media":730644,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[49,48,66],"class_list":["post-730643","post","type-post","status-publish","format-standard","has-post-thumbnail","category-science","tag-ca","tag-canada","tag-science"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/posts\/730643","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/comments?post=730643"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/posts\/730643\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/media\/730644"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/media?parent=730643"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/categories?post=730643"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/tags?post=730643"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}