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Land-Use Change and Environmental Properties Alter the Quantity and Molecular Composition of Soil-Derived Dissolved Organic Matter
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2021-05-20 , DOI: 10.1021/acsearthspacechem.1c00033 Huan Tong 1 , Andre J. Simpson 1 , Eldor A. Paul 2 , Myrna J. Simpson 1
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2021-05-20 , DOI: 10.1021/acsearthspacechem.1c00033 Huan Tong 1 , Andre J. Simpson 1 , Eldor A. Paul 2 , Myrna J. Simpson 1
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Dissolved organic matter (DOM) is a major pool of actively cycling organic carbon in soils, and can be exported to aquatic environments. The quantity and chemistry of DOM vary with different environmental factors, such as soil properties and climate. Accordingly, the amount and composition of DOM in soil and that which is exported to aquatic systems are likely altered by land-use change, but these aspects have not been studied with various environmental factors and associated land-use gradients in detail. To address this, both native and cultivated soil samples from North and South America were used to extract soil-derived DOM. DOM samples were isolated and analyzed for total organic carbon concentration and solution-state nuclear magnetic resonance spectroscopy. The concentration of dissolved organic carbon (DOC) was significantly correlated with soil organic carbon concentration (r = 0.869, p < 0.01, n = 14) and relative soil organic matter degradation state (r = −0.578, p < 0.05, n = 14). Land-use change decreased the controls of environmental factors on the concentration of DOC but enhanced the correlations between DOM aromaticity and mean annual precipitation (r = −0.957, p < 0.01, n = 7) and sand concentration (r = −0.867, p < 0.05, n = 7). This study found that land-use conversion and environmental conditions alter the quantity and quality of DOM distinctly and uniquely. Here, we identified the main factors that regulate the formation of soil DOM and its potential mobility in soil profiles as well as export to aquatic ecosystems.
中文翻译：
土地利用变化和环境特性改变土壤来源溶解有机物的数量和分子组成
溶解有机质 (DOM) 是土壤中活跃循环有机碳的主要池，可以输出到水生环境中。DOM 的数量和化学性质随土壤性质和气候等不同环境因素而变化。因此，土壤中 DOM 的数量和组成以及输出到水生系统的 DOM 的数量和组成可能会因土地利用变化而改变，但这些方面尚未与各种环境因素和相关的土地利用梯度进行详细研究。为了解决这个问题，来自北美和南美的本地和栽培土壤样本都被用来提取土壤衍生的 DOM。DOM 样品被分离并分析总有机碳浓度和溶液态核磁共振波谱。r = 0.869, p < 0.01, n = 14) 和相对土壤有机质降解状态 ( r = -0.578, p < 0.05, n = 14)。土地利用变化降低了环境因素对 DOC 浓度的控制，但增强了 DOM 芳香性与年平均降水量 ( r = -0.957, p < 0.01, n = 7) 和沙子浓度 ( r = -0.867, p < 0.05, n= 7）。本研究发现，土地利用转换和环境条件明显而独特地改变了 DOM 的数量和质量。在这里，我们确定了调节土壤 DOM 形成及其在土壤剖面中的潜在流动性以及向水生生态系统输出的主要因素。
更新日期：2021-06-17
中文翻译：
土地利用变化和环境特性改变土壤来源溶解有机物的数量和分子组成
溶解有机质 (DOM) 是土壤中活跃循环有机碳的主要池，可以输出到水生环境中。DOM 的数量和化学性质随土壤性质和气候等不同环境因素而变化。因此，土壤中 DOM 的数量和组成以及输出到水生系统的 DOM 的数量和组成可能会因土地利用变化而改变，但这些方面尚未与各种环境因素和相关的土地利用梯度进行详细研究。为了解决这个问题，来自北美和南美的本地和栽培土壤样本都被用来提取土壤衍生的 DOM。DOM 样品被分离并分析总有机碳浓度和溶液态核磁共振波谱。r = 0.869, p < 0.01, n = 14) 和相对土壤有机质降解状态 ( r = -0.578, p < 0.05, n = 14)。土地利用变化降低了环境因素对 DOC 浓度的控制，但增强了 DOM 芳香性与年平均降水量 ( r = -0.957, p < 0.01, n = 7) 和沙子浓度 ( r = -0.867, p < 0.05, n= 7）。本研究发现，土地利用转换和环境条件明显而独特地改变了 DOM 的数量和质量。在这里，我们确定了调节土壤 DOM 形成及其在土壤剖面中的潜在流动性以及向水生生态系统输出的主要因素。
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