晋陕蒙地区土壤质地重构对土壤水力性质的影响. (Chinese)

[Objective] The effects of soil texture reconstruction on soil hydraulic properties in the Shanxi-Shaanxi-Inner Mongolia region, and the improvement effect of different amounts of arsenic sandstone on sandy loess were studied, in order to providing theoretical basis for the restoration work of sandy land in the region. [Methods] Pisha sandstone and sandy loess were combined in different ratios, and the saturated water conductivity, soil water characteristic curve, available soil water-holding capacity, and other indexes were measured. [Results] ① As the proportion of Pisha sandstone increased (0%~100%), the content of sand particles (0.05~2 mm) in the reconstructed soil decreased by 8.1%~33.5%, while the content of silt particles (0.002~0.05 mm) and clay particles (＜0.002 mm) increased by 5.2%~21.0% and 2.9%~12.5%, respectively. When the content of Pisha sandstone in the reconstructed soil reached 75%, the reconstructed soil texture changed from sandy loam to loam. The Ks value of the reconstructed soil at 10 ℃ was 4.07×10 -6 m/s, which is similar to the K s value of a typical Huangmian soil under natural field conditions; ② The effects of Pisha sandstone content on the soil water characteristic curve occurred primarily in the range of high suction. When the ratio of sandy loess to Pisha sandstone was 25∶75, the soil water-holding capacity was the largest among seven ratio treatments; ③ The soil water retention capacity of reconstructed soil tended to increase as the proportion of Pisha sandstone increased. Saturated water content (θ s ) and residual water content (θ r ) values also increased. [Conclusion] The available soil water-holding capacity of the reconstituted soil was greater than observed for the other treatments when the ratio of sandy loess to Pisha sandstone was 25∶75 (soil bulk density was 1.41 g/cm³). This ratio is recommended as an optimal soil reconstruction method for this region. [ABSTRACT FROM AUTHOR]

[目的] 探究晋陕蒙地区土壤质地重构对土壤水力性质的影响, 评价砒砂岩不同添加量对砂黄土的改良效果, 为该区沙化土地修复工作提供理论依据. [方法] 将砒砂岩与砂黄土按照不同配比进行重构, 研究其饱和导水率、土壤水分特征曲线、土壤有效持水量等指标. [结果] ①随着砒砂岩比例的增加(0%～100%), 重构土中砂粒(0.05～2 mm)含量下降8.1%～33.5%, 粉粒(0.002～0.05 mm)和黏粒(＜0.002 mm)含量分别增加5.2%～21.0%, 2.9%～12.5%. 当砒砂岩与砂黄土比例达到75∶25时, 重构土壤质地由砂壤土转变为壤土; 当砒砂岩与砂黄土按照25∶75比例混合时, 该处理在10 ℃时的Ks为4.07×10 -6 m/s, 与黄土高原地区典型的黄绵土田间自然状态下的Ks值相近; ②砒砂岩添加量对土壤水分特征曲线的影响主要在高吸力段, 当砒砂岩与砂黄土的比例为25∶75时, 土壤水分有效性相对较高; ③随着砒砂岩含量增加土壤保水性能呈现上升趋势, 砒砂岩的添加比例越高, 重构土壤饱和含水量(θ s )和残余含水量(θ r )越大. [结论] 砒砂岩与砂黄土按25∶75比例重构(土壤容重1.41 g/cm³)土壤有效持水量显著高于其他处理, 是晋陕蒙地区土壤改良的有效方法. [ABSTRACT FROM AUTHOR]

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