Under one square meter of soil you can find up to 1.5 kilograms of organisms
Mosses, lichens and associated microorganisms that live on the soil surface, called biological soil crust, are a fundamental component of biodiversity in arid regions that provide important functions and ecosystem services
Alicante (Spain). Thursday, January 14th, 2021
A quarter of all known species live in the soil. Life above
If you asked people which group of animals is the most abundant on earth, hardly anyone would know the right answer. Ants? Fish? No, and not humans either. The answer is nematodes, also known as roundworms. Four out of five animals on earth belong to this group, and the reason hardly anyone is aware of the fact is that they live underground, invisible to us. Together with thousands of other soil organisms, they quietly, discreetly and constantly perform enormously important services for the world above them.
The soil is one of the most species-rich habitats in existence. Living under one square meter of healthy soil you can find up to 1.5 kilograms of organisms: among others, roundworms, earthworms, springtails, mites and insect larvae. There is also a multitude of microorganisms including bacteria, protists and fungi. They eat and transform living and dead animal and plant material into nutrients which become the basis for growth and new life. Without soil organisms, no plants would be able to grow and no humans could live.
It is therefore more astonishing that soils have so far hardly featured in international strategies for protecting biodiversity. The authors of the new article in Science see this as a big problem: “If we do not protect soils for the next generations, aboveground biodiversity and food production cannot be guaranteed either”. Their appeal goes out to the 196 nations who are currently negotiating a new strategy to protect biodiversity within the framework of the UN Convention on Biological Diversity (CBD).
Healthy soils are becoming increasingly rare. They suffer the burden of intensive cultivation with heavy machinery, fertilisers and pesticides, are compacted, built over or are lost due to wind and water erosion. Global warming is putting them under additional pressure. According to the German Heinrich Böll Foundation, around 24 billion tons of fertile soil are lost worldwide every year. As a result, the soils’ wide variety of services, such as water purification and protection against plant diseases, gradually decline. In addition, soils are the most important carbon reservoir on earth and therefore help slow global climate warming.
According to the researchers, these services are given far too little attention in the political debate. "Up to now, soil conservation has been mostly reduced to the impacts related to soil erosion and its importance for agriculture", said first author Dr Carlos Guerra (iDiv, MLU). "It's about time that soil conservation policies consider the protection of soil organisms and ecosystem functions more than just for food production and other productive systems. Soil biodiversity monitoring and conservation can support the achievement and tracking of many sustainability goals, targeting areas such as climate, food and biodiversity protection."
"Protection measures have so far mainly focused on life above ground, for example in the designation of protected areas", said senior author Dr Diana Wall from Colorado State University. However, since these do not necessarily benefit underground biodiversity, the specific needs of the biotic communities in the soil have to be taken into account.
According to the authors of the article, soil biodiversity and the ecosystem services that depend on it receive little attention in the political debate. "This is particularly evident in the arid
semi-arid and dry-subhumid areas of our planet, which cover over 40% of the terrestrial surface but whose soil biodiversity has hardly been studied" indicates Fernando T. Maestre, Distinguished Researcher at the University of Alicante and participant in the study. “In Spain, soil protection policies are mainly focused on combating desertification and pollution and more recently the proposal for a Law for the protection of soils of high agrological value and other soils of agricultural interest is on the table (122/000321 ) ”, indicates Professor María Jesús Iglesias Briones, from the University of Vigo who asserts that “it’s time that this kind of conservation policies take into consideration that soils are alive and specifically include the protection of edaphic organisms and functions they carry out and not only to ensure that industrial, urban and agricultural activities continue to operate at the same level ”.
“Soil organisms might not be the most beautiful on earth, yet soil biodiversity provides soil fertility, regulates the climate, breaks down the waste we produce and regulates food production. Without them, life would not exist on earth as we know it
In order to be able to decide which regions of the world are particularly in need of protection, and which protective measures are appropriate, sufficient information must be available on the status and trends of biodiversity in soils. Since this has not been the case so far, the researchers launched the SoilBON monitoring network. "We want to move biodiversity in soils into the focus of conservation efforts. To do this, we must provide policymakers with the necessary information to support decision-making", said senior author Prof Nico Eisenhauer, research group leader at iDiv and Leipzig University. "SoilBON will produce and support the production of the relevant data to achieve this goal."
The purpose of Soil BON is to help gather equivalent soil data, comprehensively and over extended periods of time. What is required is an internationally recognised standard which sets out what is to be recorded and how. The researchers propose a holistic system for this: the so-called Essential Biodiversity Variables (EBVs). EBVs are key parameters for measuring biodiversity. The concept was developed by, among others, iDiv and includes criteria such as soil respiration, nutrient turnover and genetic diversity. Indicators are derived from the EBVs which then serve as a basis for soil status evaluation and subsequent decisions regarding the level and type of protection necessary for the soils.
According to the researchers, their proposed monitoring and indicator system will enable the worldwide condition of soils and their capacity to function to be recorded efficiently and monitored long term. They emphasise that it also serves as an important early warning system; with its help, it will be possible to identify, at an early stage, whether existing nature conservation goals can be achieved with current measures.
Carlos A. Guerra, Richard D. Bardgett, Lucrezia Caon, Thomas W. Crowther, Manuel Delgado-Baquerizo, Luca Montanarella, Laetitia M. Navarro, Alberto Orgiazzi, Brajesh K. Singh, Leho Tedersoo, Ronald Vargas-Rojas, Maria J. I. Briones, François Buscot, Erin K. Cameron, Simone Cesarz, Antonis Chatzinotas, Don A. Cowan, Ika Djukic, Johan van der Hoogen, Anika Lehmann, Fernando T. Maestre, César Marín, Thomas Reitz, Matthias C. Rillig, Linnea C. Smith, Franciska T. de Vries, Alexandra Weigelt, Diana H. Wall & Nico Eisenhauer (2020): Tracking, targeting, and conserving soil biodiversity - A monitoring and indicator system can inform policy, Science, DOI: 10.1126/science.abd7926
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