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首页> 外文期刊>Soil Science Society of America Journal >Soil Saturation Extract Composition and Sulfate Solubility in a Tropical Semiarid Soil
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Soil Saturation Extract Composition and Sulfate Solubility in a Tropical Semiarid Soil

机译：热带半干旱土壤的饱和土壤浸出物组成和硫酸盐溶解度

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Soil solution is the major source of plant nutrients, nutrient cycling in ecosystems, and pollutant transformation and transport in soil. I examined the composition of soil saturation extract of a cultivated and an uncultivated savanna Alfisol to determine the relations of Ca2+, Mg2+, and K+ concentrations in soil solution with exchangeable Ca, Mg, and K; and to determine the solubility relations of SO4 for which there is little information in savanna soils. The soil saturation extract had ionic strength (I) below 0.001 except for one field under intensive fertilization with NPK fertilizer and farmyard manure (FYM) whose ionic strength was between 0.001 and 0.002 at a depth below 40 cm due to leaching. The Ca2+, Mg2+, and K+ in the soil saturation extract correlated weakly with exchangeable Ca, Mg, and K respectively, but K+ intensity was fairly well predicted by percentage of K saturation of cation-exchange capacity (CEC), whereas the intensities of Ca2+, Mg2+, and SO42- in soil solution were best predicted by electrolytic conductivity of the saturation extract. The K activity ratios in solution defined as aK/(aCa + aMg)1/2 were <0.01 in the cultivated soil, suggesting a preponderance of K adsorbed to edge rather than planar sites. The Ca2+ activity ratios defined as aCa/[aCations] were <0.15 for the cultivated soil, indicating possible Ca deficiency. The SO2-4 activities in solution were in apparent equilibrium with basaluminite in the cultivated fields, whereas in the uncultivated field, SO2-4 activities were in apparent equilibrium with alunite.
机译：土壤溶液是植物养分的主要来源，是生态系统中养分的循环以及土壤中污染物转化和迁移的主要来源。我检查了已耕和未耕大草原Alfisol的土壤饱和提取物 的组成，以确定 Ca 2 + ，Mg 的关系。钙，镁和钾可交换的土壤溶液 中的2 + 和K + 浓度；并确定稀树草原土壤中SO 4 的溶解度 关系。土壤饱和浸出液的离子强度（I）低于 0.001，但在 NPK肥料和农家肥（FYM）的强施肥下，其离子强度 在40 cm以下深度处在0.001至0.002之间，这是由于浸出引起的。 Ca 2 + ，Mg 2 + 和K <土壤饱和度提取物中的sup> + 分别与可交换的Ca，Mg和K弱相关，但K + 的强度为通过阳离子交换容量（CEC）的K饱和度 的百分比可以很好地预测，而 Ca 2 + ，Mg 的强度用饱和提取液的 的电导率可以最好地预测土壤溶液中的2 + 和SO 4 2-。溶液中的K活性 比率定义为 a K /（ a Ca + a Mg） 1 / 2 在耕作土壤中为<0.01 ，表明钾吸附的 在边缘而不是平面位置上占优势。耕作土壤中 a Ca / [ a 阳离子]定义的 的Ca 2 + 活度比<0.15 ，表示 可能的钙缺乏。溶液中的SO 2- 4 活性在种植的 区域与玄武岩明显平衡，而在在未耕地中，SO 2- 4 活性 与亚矾石明显处于平衡状态。

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