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Influence of parent material mineralogy on forest soil nutrient release rates across a nutrient richness gradient
Geoderma ( IF 5.6 ) Pub Date : 2024-10-31 , DOI: 10.1016/j.geoderma.2024.117081
Alexandrea M. Rice, Nicolas Perdrial, Victoria Treto, Anthony W. D’Amato, Grace A. Smith, Justin B. Richardson

The influence of parent material mineralogy on nutrient release rates in wood production forests remains poorly understood, despite its importance for sustainable forest management. This study investigated how parent material mineralogy impacts soil nutrient abundance and release rates. We studied three forests in Vermont and New Hampshire across a Ca and Mg richness gradient within the soil parent material. We found that both exchangeable and total nutrient concentrations followed the nutrient richness gradient with exchangeable Ca concentrations highest at the rich (758 mg/kg) and lowest at the poor (51.3 mg/kg) sites. Exchangeable Mg concentrations were higher at the rich (41.5 mg/kg) and moderate (42.9 mg/kg) sites relative to the poor (7.04 mg/kg) sites. Total concentrations of Ca were highest at the rich sites (13 mg/g) compared to the moderate (5.73 mg/g) and poor (5.89 mg/g). Total Mg concentrations were higher at the rich (27.3 mg/g) than the moderate (9.47 mg/g) and poor (3.07 mg/g) sites. Using τ values throughout the soil profile compared to the parent material, we found that all three forests were moderate to weakly depleted in Ca, Mg, and K in the upper 30 cm, but P was slightly enriched due to biological uplift. Additionally, we found that calculated field nutrient release rates did not significantly differ among forest nutrient status (p > 0.05), indicating the limited effects from across parent materials. We also conducted a follow up batch reactor experiment at varying pH conditions (4, 5, 6) with organic acids (NaCl, catechol, and citric acid). As expected, pH 4 had the highest Mg release rate (2.19 mg/m2/day) compared to pH 5 (1.27 mg/m2/day), and pH 6 (0.888 mg/m2/day), but surprisingly no effect on Ca release rates, suggesting the more acidic soils of the base cation poor soils results in higher release rates. Our results highlight the dominant contributions of parent material mineralogy has on Ca and Mg release rates, but also that weathering of primary minerals can sustain forest ecosystem productivity.

中文翻译:


母质矿物学对养分丰富度梯度上森林土壤养分释放速率的影响



尽管母质矿物学对可持续森林管理很重要,但对木材生产林养分释放率的影响仍然知之甚少。本研究调查了母质矿物学如何影响土壤养分丰度和释放速率。我们研究了佛蒙特州和新罕布什尔州的三片森林,研究了土壤母质中 Ca 和 Mg 富度梯度。我们发现可交换营养物质浓度和总营养物质浓度都遵循营养丰富度梯度,可交换 Ca 浓度在富矿区最高 (758 mg/kg),在贫穷矿区最低 (51.3 mg/kg)。相对于贫乏 (4.04 mg/kg) 地点,富 (41.5 mg/kg) 和中等 (42.9 mg/kg) 地点的可交换 Mg 浓度较高。与中度 (5.73 mg/g) 和差 (5.89 mg/g) 相比,富位点 (13 mg/g) 的 Ca 总浓度最高。富 (27.3 mg/g) 站点的总 Mg 浓度高于中度 (9.47 mg/g) 和贫乏 (3.07 mg/g) 站点。与母质相比,在整个土壤剖面中使用 τ 值,我们发现所有三片森林在上部 30 cm 的 Ca、Mg 和 K 均处于中度至轻度枯竭状态,但由于生物隆起,P 略有富集。此外,我们发现计算的田间养分释放速率在森林养分状况之间没有显著差异 (p > 0.05),表明不同母材料的影响有限。我们还在不同 pH 条件 (4、5、6) 下使用有机酸(NaCl、邻苯二酚和柠檬酸)进行了后续间歇式反应器实验。正如预期的那样,与 pH 5(2.19 mg/m2/天)和 pH 6(0.888 mg/m2/天),但令人惊讶的是,对 Ca 释放速率没有影响,这表明碱阳离子贫瘠土壤的酸性土壤导致释放速率更高。我们的结果强调了母体材料矿物学对 Ca 和 Mg 释放速率的主要贡献,但也强调了原生矿物的风化可以维持森林生态系统的生产力。
更新日期:2024-10-31
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