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Effects of increasing water activity on the relationship between water vapor sorption and clay content
Soil Science Society of America Journal ( IF 2.9 ) Pub Date : 2021-02-20 , DOI: 10.1002/saj2.20236 Xue Song 1 , Chong Chen 1 , Emmanuel Arthur 2 , Markus Tuller 3 , Hu Zhou 4 , Tusheng Ren 1
Soil Science Society of America Journal ( IF 2.9 ) Pub Date : 2021-02-20 , DOI: 10.1002/saj2.20236 Xue Song 1 , Chong Chen 1 , Emmanuel Arthur 2 , Markus Tuller 3 , Hu Zhou 4 , Tusheng Ren 1
Affiliation
The dependence of the relationship between hygroscopic water content (θh) and clay content on water activity is not well understood. Here, we determined the correlation coefficients between θh (or the slope of soil water vapor adsorption isotherms, Svai) and clay content at nine water activity levels (i.e., 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, and 0.9) and investigated the evolution of correlation coefficients with increasing water activity for 65 soils with mixed and illitic clay mineralogy. The correlation coefficient between θh0.1 (water content at a water activity of 0.1) and clay content was the lowest (.82) due to the differences in soil-specific hydration processes. At the water activity range from 0.1 to 0.6, the Svai showed stronger correlations (r = .91–.93) with clay content than θh0.1 because the multilayer sorption controlled by van der Waals force is related to clay content. When water activity increased from 0.1 to 0.6, the observed strong correlation between Svai and clay content resulted in an increase of correlation coefficient between θh and clay content from .82 to .96. Compared with the correlation (r = .96) between θh and clay content at the beginning of condensation process, a weaker correlation (r = .87–.92) between Svai and clay content was observed during condensation process, which led to a slight strengthening of the correlation between θh and clay content at high water activities (>0.6). This was explained by the different clay particle properties and water activity thresholds for initiation of condensation.
中文翻译:
增加水分活度对水蒸气吸附和粘土含量之间关系的影响
吸湿性含水量 (θ h ) 和粘土含量之间的关系对水分活度的依赖性尚不清楚。在这里,我们确定了 θ h(或土壤水蒸气吸附等温线的斜率,S vai)与九个水分活度水平(即,0.1、0.2、0.3、0.4、0.5、0.6、0.7、0.8)下粘土含量之间的相关系数, 和 0.9) 并研究了 65 种混合和伊利石粘土矿物的相关系数随水分活度增加的演变。θ h0.1之间的相关系数(水分活度为 0.1 时的含水量)和粘土含量最低(0.82),这是由于土壤特定水化过程的差异。在 0.1 到 0.6 的水分活度范围内,S vai与粘土含量的相关性 ( r = .91-.93) 比 θ h0.1 更强,因为范德华力控制的多层吸附与粘土含量有关。当水分活度从 0.1 增加到 0.6 时,观察到的S vai和粘土含量之间的强相关性导致 θ h和粘土含量之间的相关系数从 0.82 增加到 0.96。与 θ h之间的相关性 ( r = .96)相比和凝结过程开始时的粘土含量,在凝结过程中观察到S vai和粘土含量之间的相关性较弱(r = .87-.92),这导致 θ h与粘土含量之间的相关性略微加强高水分活度 (>0.6)。这可以通过不同的粘土颗粒特性和凝结开始的水活度阈值来解释。
更新日期:2021-02-20
中文翻译:
增加水分活度对水蒸气吸附和粘土含量之间关系的影响
吸湿性含水量 (θ h ) 和粘土含量之间的关系对水分活度的依赖性尚不清楚。在这里,我们确定了 θ h(或土壤水蒸气吸附等温线的斜率,S vai)与九个水分活度水平(即,0.1、0.2、0.3、0.4、0.5、0.6、0.7、0.8)下粘土含量之间的相关系数, 和 0.9) 并研究了 65 种混合和伊利石粘土矿物的相关系数随水分活度增加的演变。θ h0.1之间的相关系数(水分活度为 0.1 时的含水量)和粘土含量最低(0.82),这是由于土壤特定水化过程的差异。在 0.1 到 0.6 的水分活度范围内,S vai与粘土含量的相关性 ( r = .91-.93) 比 θ h0.1 更强,因为范德华力控制的多层吸附与粘土含量有关。当水分活度从 0.1 增加到 0.6 时,观察到的S vai和粘土含量之间的强相关性导致 θ h和粘土含量之间的相关系数从 0.82 增加到 0.96。与 θ h之间的相关性 ( r = .96)相比和凝结过程开始时的粘土含量,在凝结过程中观察到S vai和粘土含量之间的相关性较弱(r = .87-.92),这导致 θ h与粘土含量之间的相关性略微加强高水分活度 (>0.6)。这可以通过不同的粘土颗粒特性和凝结开始的水活度阈值来解释。