Flux continu

Metals and metalloids are ubiquitous in soils, originating from bedrock and from human activities and infrastructure. These compounds can be toxic to humans and other organisms, and their soil distribution and concentrations at global scale are not well known. Hou et al. analyzed data from more than 1000 regional studies to identify areas of metal toxicity and explore drivers of these trends. They estimate that 14 to 17% of cropland exceeds agricultural thresholds for at least one toxic metal.

Depleted soil leads to reduced yields, forcing farmers to rely on fertilizers that raise food production costs, consumer prices.

Soils are known to be an enormous reservoir of carbon and represent an important and dynamic part of the global carbon cycle. However, this reservoir is under constant threat due to a combination of issues, including mismanagement, climate change and intensive agricultural production which has led to depletion of soil organic carbon. Understanding and fostering soil carbon sequestration reviews the wealth of research on important aspects of soil carbon sequestration, including its potential in mitigating and adapting to climate change and improving global food security. The collection explores our understanding of carbon sequestration in soils, detailing the mechanisms and abiotic factors that can affect the process, as well as the socioeconomic, legal and policy issues that can arise as a result of this use. In its extensive exploration of soil carbon cycling and capture, the book highlights how an informed understanding of carbon sequestration in a variety of soil types can contribute to achieving a more su

Climate change affects the Arctic and sub-Arctic regions by exposing previously frozen permafrost to thaw, unlocking soil nutrients, changing hydrological processes, and boosting plant growth. As a result, sub-Arctic tundra is subject to a shrub expansion, called “shrubification”, at the expense of sedge species. Depending on the intrinsic foliar properties of these plant species, changes in foliar mineral element fluxes with shrubification in the context of permafrost degradation may influence topsoil mineral element composition. Despite the potential implications of changes in topsoil mineral element concentrations for the fate of organic carbon, this remains poorly quantified. Here, we investigate vegetation foliar and topsoil mineral element composition (Si, K, Ca, P, Mn, Zn, Cu, Mo, V) across a natural gradient of permafrost degradation at a typical sub-Arctic tundra at Eight Mile Lake (Alaska, USA). Results show that foliar mineral element concentrations are higher (up to 9 times; Si, K, Mo for all spec

Protéger les sols, une urgence pour 2010 et au-delà En 2010, déclarée Année internationale de la biodiversité par les Nations unies, la biodiversité des sols constitue un pan entier de la biodiversité mondiale trop souvent négligé. La santé des sols dépend de l’étendue des formes de vie qu’ils abritent: des bactéries aux champignons, en passant par des insectes minuscules, les lombrics (ou vers de terre) ou les taupes. Ensemble, ils procurent des avantages incommensurables pour la vie sur Terre. Cette biodiversité joue un rôle essentiel sur l’atténuation du changement climatique, le stockage et la purification de l’eau, la fourniture d’antibiotiques et la prévention de l’érosion. Le bien-être de toutes les plantes et animaux terrestres dépend de la complexité des processus qui se déroulent dans les sols.

Microplastics are deposited in river floodplains and carried down to deeper levels, according to a study published in the journal Science of the Total Environment. Local topography, frequency of floods, and soil characteristics can affect the amount of plastic particles that are deposited and potentially carried into deeper soil.

Food supply expert paints grim global picture hunger 05.23.2022 By Arvin Donley NEW YORK, NEW YORK, US — Global wheat inventories currently stand at about 10 weeks of global consumption, a food supply expert said during a special meeting of the United Nations Security Council on May 19. Sara Menker, chief executive officer of Gro Intelligence, an organization that gathers and analyzes global food and agricultural data, said she disputes official government agency estimates that put global wheat inventories at 33% of annual consumption, countering inventories are closer to 20%. “It is important to note that the lowest grain inventory levels the world has ever seen are now occurring while access to fertilizers is highly constrained, and drought in wheat growing regions around the world is the most extreme it’s been in over 20 years,” Menker said. “Similar inventory concerns also apply to corn and other grains. Government estimates are not adding up.” Menker told the security council that while much of the blame

Certains producteurs de tomates sous serres chauffées se voient obligés d'arrêter le chauffage pour éviter la faillite. En cause : la multiplication par 10 des prix du gaz depuis le début de la guerre sur le sol ukrainien le 24 février.

Satisfying the increased demand for food is placing pressure on the world’s water, land and soil resources. Agriculture has its part to play in alleviating these pressures and contributing positively to climate and development goals. Sustainable agricultural practices can lead to direct improvements in the state of land, soil and water, and generate ecosystem benefits as well as reduce emissions from land. Accomplishing all these requires accurate information and a major change in how we manage the resources. It also requires complementing efforts from outside the natural resources management domain to maximize synergies and manage trade-offs.

Agricultural pesticide use and its associated environmental harms is widespread throughout much of the world. Efforts to mitigate this harm have largely been focused on reducing pesticide contamination of the water and air, as runoff and pesticide drift are the most significant sources of offsite pesticide movement. Yet pesticide contamination of the soil can also result in environmental harm.