Purpose

Study the effect of both silt and clay fractions on stabilizing organic carbon and total nitrogen in soils of some old cultivated fruit orchards in Sohag, Egypt.

Methods

Eleven surface soil samples (0–15 cm) were collected. Silt (63–2 μm) and clay (< 2 μm) fractions were separated from soils and analyzed for cation exchange capacity (CEC), organic carbon (OC), total nitrogen (TN), specific surface area (SSA), X-ray diffraction (XRD) and Fourier Transform Infrared (FTIR) spectroscopic analysis were determined using the standard analysis methods.

Results

The silt and clay were responsible for 77.49 to 93.34% of soil CEC. The SSA of clay was twice the silt, and the phyllosilicates (%) average was 29.83% and 62.70% in silt and clay. Other minerals, such as quartz, feldspar, and carbonate minerals, were detected in these fractions. The phyllosilicate species of clay were smectite-illite mixed layers (44.4–88.9%), Smectite (1.0–6.4% except one sample recorded 45.7%), Kaolinite (3.7–10.5%) and kaolinite/smectite mixed layers (2.0–8.2%). The average OC-silt and clay were 6.79 and 8.96 g OC kg⁻¹ soil (38.01 and 50.28% of soil OC). On average, the total nitrogen (TN) in silt and clay particles was 0.817 and 1.156 g N kg⁻¹ soil (35.88 and 50.66% of soil TN). The OC and N content significantly and positively correlated with CEC, SSA, and phyllosilicates in the fine fractions.

Conclusion

Results showed that the soil's capacity to sequester OC and N is affected significantly by its fine particles' content, characteristics, and mineralogy.

中文翻译：

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埃及 Sohag 省尼罗河漫滩部分老果园土壤中淤泥和粘土组分在有机碳和氮稳定中的作用

目的

研究淤泥和粘土部分对稳定埃及 Sohag 一些老栽培果园土壤中有机碳和总氮的影响。

方法

收集了 11 个表层土壤样本（0-15 厘米）。从土壤中分离出淤泥 (63–2 μm) 和粘土 (< 2 μm) 部分，并分析阳离子交换容量 (CEC)、有机碳 (OC)、总氮 (TN)、比表面积 (SSA)、X-使用标准分析方法确定射线衍射 (XRD) 和傅里叶变换红外 (FTIR) 光谱分析。

结果

淤泥和粘土占土壤 CEC 的 77.49% 至 93.34%。粘土的SSA是粉土的两倍，粉土和粘土的页硅酸盐（%）平均值分别为29.83%和62.70%。在这些馏分中检测到其他矿物，例如石英、长石和碳酸盐矿物。粘土的层状硅酸盐种类为蒙脱石-伊利石混合层（44.4-88.9%）、蒙脱石（1.0-6.4%，其中一个样品记录为 45.7%）、高岭石（3.7-10.5%）和高岭石/蒙脱石混合层（2.0-8.2%） ). 平均 OC-淤泥和粘土分别为 6.79 和 8.96 g OC kg ^-1土壤（土壤 OC 的 38.01 和 50.28%）。平均而言，淤泥和粘土颗粒中的总氮 (TN) 分别为 0.817 和 1.156 g N kg ^-1土壤（土壤总氮的 35.88% 和 50.66%）。OC 和 N 含量与细粒中的 CEC、SSA 和层状硅酸盐显着正相关。

结论

结果表明，土壤吸收 OC 和 N 的能力受其细颗粒含量、特性和矿物学的显着影响。