The surface area and reactivity of granitic soils: I. Dissolution rates of primary minerals as a function of depth and age deduced from field observations
The surface area and reactivity of granitic soils: I. Dissolution rates of primary minerals as a function of depth and age deduced from field observations
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花岗岩土壤的表面积和反应性： I. 根据现场观测推导出的原生矿物溶解速率与深度和年龄的函数关系
DOI：
10.1016/j.geoderma.2014.08.004
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发表时间：
2015
期刊：
影响因子：
6.1
通讯作者：
E. Oelkers
中科院分区：
文献类型：
--
作者：
Samuel A. Parry;M. Hodson;S. Kemp;E. Oelkers
表面积归一化的溶解速率的主要矿物在两个不同的花岗岩土壤位于1）达特穆尔国家公园，英格兰和2）格伦染料，苏格兰被确定为深度的函数。每种土壤取样深度约为1 m。最大土壤年龄的基础上14 C分析的胡敏素部分的土壤是15,600年和4400年的达特穆尔和格伦染料土壤剖面，分别。在B和C层中，测得的土壤矿物的BET表面积接近5 m2/g，但在接近表面处减小至小于1 m2/g。检索的几何表面积归一化矿物溶解速率是最快的表面和在rock-土壤界面，这种行为被解释为干从一个组合的方法来平衡的土壤沃茨与深度和更快的溶解速率的新鲜与风化表面。在土壤表面，矿物的相对溶解速率顺序为石英>长石>云母，石英的几何表面积溶解速率最快可达2.6 ~ 4.1 × 10− 13 mol/m2/s。正如在过去的一些研究中所观察到的，在这项研究中获得的基于现场的速率显着低于实验室研究中获得的相应速率，这表明后者的速率可能无法准确地描述土壤中原生矿物的反应性。
Surface area-normalised dissolution rates of the primary minerals in two distinct granitic soils located in 1) the Dartmoor National Park, England and 2) Glen Dye, Scotland were determined as a function of depth. Each soil was sampled to a depth of ~ 1 m. The maximum soil ages based on14C analysis of the humin fraction of the soil are 15,600 and 4400 years for the Dartmoor and Glen Dye soil profiles, respectively. The measured BET surface areas of the soil minerals are close to 5 m2/g in the B and C horizons, but decrease to less than 1 m2/g close to the surface. Retrieved geometric surface area normalised mineral dissolution rates are most rapid at the surface and at the bedrock–soil interface; this behaviour is interpreted to stem from a combination of the approach to equilibrium of the soil waters with depth and more rapid dissolution rates of fresh versus weathered surfaces. At the soil surface, the relative mineral dissolution rate order is found to be quartz > feldspar > mica, with quartz geometric surface area dissolution rates as fast as 2.6 to 4.1 × 10− 13mol/m2/s. As observed in a number of past studies, field based rates obtained in this study are significantly slower than corresponding rates obtained from laboratory studies, suggesting that these latter rates may not accurately describe the reactivity of primary minerals in soils.
影响因子：
5
作者：
K. Norton;F. Blanckenburg
通讯作者：
K. Norton;F. Blanckenburg
影响因子：
5.8
作者：
Bonneville, Steeve;Smits, Mark M.;Benning, Liane G.
通讯作者：
Benning, Liane G.