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首页> 外文期刊>Arabian journal of geosciences >The spatial distribution of potassium status and clay mineralogy in relation to different land-use types in a calcareous Mediterranean environment
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The spatial distribution of potassium status and clay mineralogy in relation to different land-use types in a calcareous Mediterranean environment

机译：地中海钙质环境中钾素状况和粘土矿物学与不同土地利用类型的空间分布

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摘要

In order to investigate changes caused in clay mineralogy and potassium (K) status by different land-use types, 42 soils samples (0-30 cm) were monitored and analyzed. Soil samples belonging to Reference Soil Groups of Cambisols and Vertisols were collected from three neighboring land uses involving cropland (under long-term continuous cultivation), grassland, and forestland. The soils reflected an alkaline and calcareous aspect as were characterized by high pH (mean of 7.1 to 7.5) and calcium carbonate equivalent (mean of 35 to 97 gkg-1) in the three land-use types. X-ray diffraction patterns of the clay fraction showed that the soils were mainly composed of illite, smectite, chlorite, and kaolinite. Chlorite and kaolinite remained unweathered irrespective of land use and soil types, soil processes, and physicochemical attributes assessed. Some changes in the XRD diffractograms of illite and smectite (the intensity or the position of peaks) were observed in the cultivated soils compared to those of the adjoining grassland that may explain the dynamics of the K trapped in illite interlayer sites. Potassium issues reflected a heterogeneous response to changes in land-use types. In light of this, a pronounced variation in soluble K (4-22 mgkg~(-1)), exchangeable K (140-558 mgkg~(-1)), and non-exchangeable K (135-742 mgkg~(-1)) appeared among the land-use types for both Cambisols and Vertisols, corresponding to variability in clay content, nature and type of clay mineral (mainly illite and smectite), cation exchange capacity (CEC), and soil organic carbon (SOC). In general, the largest amounts of soluble K and exchangeable K were recorded in the forestland, whereas the highest contents of non-exchangeable K were found in the grassland for both Cambisols and Vertisols. Exchangeable K, available K, CEC, and clay contents in the soils with higher smectite values (25-50 %) were significantly different (P≤0.05) compared to those of the lower smectite values (10-25 %). This suggests that smectite is a major source for surface sorption of K in the studied soils.
机译：为了调查不同土地利用类型引起的粘土矿物学和钾（K）状况变化，对42个土壤样本（0-30厘米）进行了监测和分析。属于坎比亚索尔和韦尔蒂索尔参考土壤群的土壤样品是从三个相邻的土地利用（包括长期耕作），草地和林地中采集的。在三种土地利用类型中，土壤表现出碱性和钙质特征，其特征在于高pH（平均7.1至7.5）和碳酸钙当量（平均35至97 gkg-1）。粘土组分的X射线衍射图表明，土壤主要由伊利石，绿土，绿泥石和高岭石组成。不论土地使用和土壤类型，土壤过程以及所评估的理化属性如何，亚氯酸盐和高岭石都不会风化。与毗邻草地相比，在耕作土壤中观察到了伊利石和蒙脱石的XRD衍射图的某些变化（强度或峰的位置），这可能解释了伊利石层间位点中捕获的K的动态。钾问题反映了对土地利用类型变化的不同反应。鉴于此，可溶性钾（4-22 mgkg〜（-1）），可交换钾（140-558 mgkg〜（-1））和不可交换钾（135-742 mgkg〜（-）明显变化。 1））出现在Cambisols和Vertisols的土地利用类型中，对应于粘土含量，粘土矿物的性质和类型（主要是伊利石和蒙脱石），阳离子交换容量（CEC）和土壤有机碳（SOC）的变化。 。通常，林地中可溶性K和可交换K的量最大，而草地上的坎比索和韦尔提索中不可交换K的含量最高。蒙脱石值较高（25-50％）的土壤中的交换性钾，速效钾，CEC和粘土含量与蒙脱石值较低（10-25％）的土壤相比有显着差异（P≤0.05）。这表明绿土是研究土壤中钾表面吸附的主要来源。

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