160 results for group: journal-article


Effects of Rock Powder Additions to Cattle Slurry on Ammonia and Greenhouse Gas Emissions

Maria Eunice Paulade Souza, André Mundstock Xavierde Carvalho, Daniely de Cássia Deliberali, Ivo Jucksch, George Gardner Brown, Eduardo Sá Mendonça, Irene Maria Cardoso Abstract For several decades, farmers have been mixing rock powders with livestock slurry to reduce its NH3 emissions and increase its nutrient content. However, mixing rock powders with slurry is controversial, and there is currently no scientific evidence for its effects on NH3 and greenhouse gas (GHG) emissions or on changes in its nutrient content due to element release from rock powders. The major aim of this study was therefore to analyze the effects of mixing two ...

Urban Farming with Enhanced Rock Weathering As a Prospective Climate Stabilization Wedge

Fatima Haque, Rafael M. SantosRafael M. Santos Abstract With no single carbon capture and sequestration solution able to limit the global temperature rise to 1.5−2.0 °C by 2100, additional climate stabilization measures are needed to complement current mitigation approaches. Urban farming presents an easy-to-adopt pathway toward carbon neutrality, unlocking extensive urban surface areas that can be leveraged to grow food while sequestering CO2. Urban farming involves extensive surface areas, such as roofs, balconies, and vertical spaces, allowing for soil presence and atmospheric carbon sequestration through air-to-soil contact. In this ...

Prospects for CO2 mineralization and enhanced weathering of ultramafic mine tailings from the Baptiste nickel deposit in British Columbia, Canada

Ian M.Power, Gregory M.Dipple, Peter M.D.Bradshaw, Anna L.Harrison Abstract The Baptiste deposit is located within the Decar nickel district in British Columbia, Canada and is a promising candidate for a CO2 sequestration demonstration project. The deposit contains awaruite (nickel-iron alloy) hosted in an ultramafic complex, which is dominated by serpentine [Mg3Si2O5(OH)4; ∼80 wt.%] and contains reactive brucite [Mg(OH)2; 0.6–12.6 wt.%]. Experiments were conducted using metallurgical test samples and pulps from cores with the aim of determining the potential for this deposit to sequester CO2 via direct air capture of atmospheric CO2 and ...

Large carbon sink potential of secondary forests in the Brazilian Amazon to mitigate climate change

Viola H. A. Heinrich, Ricardo Dalagnol, Henrique L. G. Cassol, Thais M. Rosan, Catherine Torres de Almeida, Celso H. L. Silva Junior, Wesley A. Campanharo, Joanna I. House, Stephen Sitch, Tristram C. Hales, Marcos Adami, Liana O. Anderson & Luiz E. O. C. Aragão Abstract Tropical secondary forests sequester carbon up to 20 times faster than old-growth forests. This rate does not capture spatial regrowth patterns due to environmental and disturbance drivers. Here we quantify the influence of such drivers on the rate and spatial patterns of regrowth in the Brazilian Amazon using satellite data. Carbon sequestration rates of young secondary ...

Exploring cross-national public support for the use of enhanced weathering as a land-based carbon dioxide removal strategy

Elspeth Spence, Emily Cox & Nick Pidgeon Abstract This study explores how public attitudes across three countries influence support towards terrestrial enhanced weathering, whereby silicate minerals are applied to agricultural land to remove carbon dioxide from the atmosphere. An online survey was administered in Australia (N = 1000), the UK (N = 1000), and the USA (N = 1026) where there are ongoing field trials of this technique. Findings are similar across all three countries with many participants unfamiliar with enhanced weathering and unsure about supporting the use of enhanced weathering. Results show that positive affect is the main ...

Direct measurement of CO2 drawdown in mine wastes and rock powders: Implications for enhanced rock weathering

Amanda R.Stubbs, Carlos Paulo, Ian M.Power, Baolin Wang, Nina Zeyen, Siobhan A.Wilson Abstract Enhanced rock weathering (ERW) sequesters CO2 via solubility and mineral trapping and can be implemented by the mining industry to reduce their net greenhouse gas emissions. Kimberlite residues from Venetia Diamond Mine in South Africa, as well as powdered forsterite, serpentinite, wollastonite skarn, and 10 wt.% brucite mixed with quartz sand, were tested as potential feedstocks for ERW. A CO2 flux system directly measured CO2 removal rates and sensors tracked laboratory conditions and pore water saturation during a series of 2-week experiments. With ...

Bedrock Weathering Controls on Terrestrial Carbon-Nitrogen-Climate Interactions

Pawlok Dass, Benjamin Z. Houlton, Yingping Wang, David Wårlind, Scott Morford Abstract Anthropogenic nitrogen deposition is widely considered to increase CO2 sequestration by land plants on a global scale. Here, we demonstrate that bedrock nitrogen weathering contributes significantly more to nitrogen-carbon interactions than anthropogenic nitrogen deposition. This working hypothesis is based on the introduction of empirical results into a global biogeochemical simulation model over the time period of the mid-1800s to the end of the 21st century. Our findings suggest that rock nitrogen inputs have contributed roughly 2–11 times more to plant ...

Global Beiogeochemical Cycles

Anthropogenic nitrogen deposition is widely considered to increase CO2 sequestration by land plants on a global scale. Here, we demonstrate that bedrock nitrogen weathering contributes significantly more to nitrogen-carbon interactions than anthropogenic nitrogen deposition. This working hypothesis is based on the introduction of empirical results into a global biogeochemical simulation model over the time period of the mid-1800s to the end of the 21st century. Our findings suggest that rock nitrogen inputs have contributed roughly 2–11 times more to plant CO2 capture than nitrogen deposition inputs since pre-industrial times. Climate change ...

Remineralizing soils? The agricultural usage of silicate rock powders: A review

Philipp Swoboda Thomas F.Döring Martin Hamer Abstract Soil nutrient depletion threatens global food security and has been seriously underestimated for potassium (K) and several micronutrients. This is particularly the case for highly weathered soils in tropical countries, where classical soluble fertilizers are often not affordable or not accessible. One way to replenish macro- and micronutrients are ground silicate rock powders (SRPs). Rock forming silicate minerals contain most nutrients essential for higher plants, yet slow and inconsistent weathering rates have restricted their use in the past. Recent findings, however, challenge past ...

Testing the ability of plants to access potassium from framework silicate minerals

David A C Manning, Joana Baptista, Mallely Sanchez Limon, Kirsten Brandt Abstract The availability of K, essential for plant growth, from syenite (a silicate rock in which potassium feldspar is the dominant mineral; N 90 wt%), and phlogopite mica has been demonstrated using carefully designed plant growth pot experiments in which the only added source of K was the mineral of interest, with no loss of nutrients through drainage. Using pure quartz sand as a soil, both growth (increase in diameter) of leek plants and K-content of the plant material showed a dose-dependent positive response to the application (114–43000 mg K/pot) of milled ...