Information on the spatial distribution of plant nutrients is a prerequisite to predict their behaviour and to monitor the fertility in a watershed. This study was conducted to evaluate variations of plant available potassium (PAK) and non-exchangeable potassium (NEK) of a watershed with different land use and parent materials. Eight hundred soil samples were taken from 0–30 and 30–60 cm depths across the Kazova watershed of 20?656?ha in size. Average PAK was 152.8 mg/K kg in surface layers and 167.2 mg/kg in subsurface layers. NEK was 925 mg K/kg in surface and 167.2 mg K/kg in subsurface layers. All forms of K were the lowest in soils formed over serpentinite. Soils in pastures had the highest PAK and NEK. Both K forms were positively related to clay content. Spatial variability patterns of PAK and NEK were similar and consistent at both soil depths. The variation in parent material and land use is considered as the main cause for large variations of potassium forms.
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机译：有关植物养分空间分布的信息是预测其行为并监测流域肥力的前提。进行这项研究以评估具有不同土地利用和母本材料的流域植物有效钾（PAK）和不可交换钾（NEK）的变化。在20到656公顷公顷的Kazova流域中，从0–30和30–60 cm深度采集了800个土壤样品。表层的平均PAK为152.8 mg / K kg，表层的平均PAK为167.2 mg / kg。表面的NEK为925 mg K / kg，地下的NEK为167.2 mg K / kg。在蛇纹石上形成的所有土壤中，钾的含量最低。牧场的土壤中PAK和NEK最高。两种钾形态均与粘土含量成正相关。在两种土壤深度，PAK和NEK的空间变异性模式相似且一致。母本材料和土地用途的变化被认为是钾形态发生较大变化的主要原因。
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