University of Lausanne, Institute of Earth Surface Dynamics, CH-1015 Lausanne, Switzerland.
University of Lausanne, Institute of Earth Surface Dynamics, CH-1015 Lausanne, Switzerland.
Sci Total Environ. 2024 Dec 1;954:176297. doi: 10.1016/j.scitotenv.2024.176297. Epub 2024 Sep 14.
Terrestrial enhanced rock weathering (ERW) is a promising carbon dioxide removal technology that consists in applying ground silicate rock such as basalt on agricultural soils. On top of carbon sequestration, ERW has the potential to raise the soil pH and release nutrients, thereby improving soil fertility. Despite these possible co-benefits, concerns such as heavy metal pollution or soil structure damage have also been raised. To our knowledge, these contrasted potential effects of ERW on soil fertility have not yet been simultaneously investigated. This field trial aimed at assessing the impact of ERW on biological, physical, and chemical soil properties in a temperate agricultural context. To do so, three vineyard fields in Switzerland were selected for their distinct geochemical properties and were amended with basaltic rock powder at a dose of 20 tons per hectare (2 kg.m). On each field, basaltic rock powder was either applied one year before the sampling campaign, one month before the sampling campaign, or not applied (control) for a total of 27 plots with 9 repetitions of each level. Overall, basaltic rock powder addition had a predominantly positive to neutral effect on soil fertility. Most soil properties showed no significant change either 1 month or 1 year post application. Nevertheless, our study highlighted a significant increase in earthworm abundance (+71 % on average), soil respiration (+50 %) and extractable sodium concentration (+23 %) as early as 1 month post application. The higher soil respiration raises the question of CO losses from organic matter mineralization that could limit ERW's efficiency. The increase in sodium raises concerns about a sodification risk potentially damaging soil fertility. These elements now require further investigation before enhanced rock weathering can be considered a viable and secure carbon dioxide removal technology.
陆地增强岩石风化 (ERW) 是一种很有前途的二氧化碳去除技术，它包括在农业土壤上施用地面硅酸盐岩石，如玄武岩。除了碳封存之外，ERW 还有可能提高土壤 pH 值并释放养分，从而提高土壤肥力。尽管有这些可能的共同效益，但也有人担心重金属污染或土壤结构破坏等问题。据我们所知，ERW 对土壤肥力的这些对比潜在影响尚未同时进行研究。本田间试验旨在评估 ERW 在温带农业背景下对土壤生物、物理和化学性质的影响。为此，选择了瑞士的三个葡萄园，因为它们具有不同的地球化学特性，并以 20 吨/公顷（2kg/m）的剂量添加玄武岩粉末。在每个田间，玄武岩粉末要么在采样前一年施用，要么在采样前一个月施用，要么不施用（对照），共 27 个地块，每个水平重复 9 次。总体而言，玄武岩粉末的添加对土壤肥力有积极到中性的影响。大多数土壤特性在施用后 1 个月或 1 年内均无显著变化。然而，我们的研究强调了施用后 1 个月就出现了蚯蚓丰度（平均增加 71%）、土壤呼吸（增加 50%）和可提取钠浓度（增加 23%）的显著增加。较高的土壤呼吸引发了关于有机物质矿化过程中 CO 损失的问题，这可能限制了 ERW 的效率。钠的增加引发了对潜在损害土壤肥力的钠化风险的担忧。在增强岩石风化被认为是一种可行和安全的二氧化碳去除技术之前，这些因素需要进一步研究。
