ABSTRACT Understanding the spatial characteristics of soil properties would be helpful in recognizing their relationship and the development of site-specific management techniques. The paper aims to identify any spatial heterogeneity of the P-related properties in a plot scale and to explain the main mechanisms influencing this variability in the upper layer of arable Luvisols. Samples were collected from the upper soil horizon in April and August 2008. The content of the total (PTOT), available (PAVAIL), inorganic (PINORG) and organic (PORG) form of P and the acid (ACP) and alkaline (ALP) phosphatase activity were assessed. The ALP was significantly higher in April than in August, while the ACP did not differ between the sampling dates. The PINORG was significantly higher in August than in April, while the other P forms did not differ seasonally. The PORG content, PAVAIL concentration and ALP activity in April revealed a moderate spatial variability, while the PAVAIL content and ACP in August showed a strong variability. No significant relationship was found between any P form and the phosphatase activity. The results are essential to predict the contribution of internal factors in the total variability of soil properties that can interfere with the influence of soil management practices.

中文翻译：

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与磷酸酶活性相关的土壤磷含量的空间格局和季节变化：以 Luvisols 为例

摘要 了解土壤特性的空间特征将有助于认识它们的关系和特定地点管理技术的发展。本文旨在确定地块尺度上 P 相关特性的任何空间异质性，并解释影响可耕地 Luvisols 上层这种变异性的主要机制。样品于 2008 年 4 月和 8 月从上层土壤层收集。 P 的总含量 (PTOT)、有效 (PAVAIL)、无机 (PINORG) 和有机 (PORG) 形式以及酸 (ACP) 和碱 (ALP) ) 磷酸酶活性进行了评估。4 月份的 ALP 显着高于 8 月份，而 ACP 在采样日期之间没有差异。8 月份的 PINORG 显着高于 4 月份，而其他 P 形式没有季节性差异。4 月份 PORG 含量、PAVAIL 浓度和 ALP 活性呈现出适度的空间变异性，而 8 月份 PAVAIL 含量和 ACP 呈现出较强的变异性。未发现任何 P 形式与磷酸酶活性之间存在显着关系。结果对于预测内部因素对土壤特性总变异性的贡献至关重要，这些因素可能会干扰土壤管理实践的影响。