Lu Chun, Sugihara Soh, Noma Satoshi, Tanaka Haruo, Tajima Ryosuke, Matsumoto Shingo, Hirose Dai, Zhang Xueyan, Wang Ning, Ban Takuya
United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan.
Institute of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan.
Plants (Basel). 2025 Jan 11;14(2):189. doi: 10.3390/plants14020189.
Phosphorus (P) availability in soils is often constrained by its accumulation in non-labile phosphorus (NLP) forms, limiting its accessibility to plants. This study examines how soil physical properties, chemical characteristics, and climatic conditions influence phosphorus fractionation and the transformation of NLP into plant-available labile phosphorus (LP). Utilizing global structural equation modeling (SEM), we found that silt content enhances organic phosphorus fractions, including NaHCO-Po and NaOH-Po. In the upper 30 cm of soil, pH decreases the availability of NaHCO-Po and NaOH-Po while stabilizing NLP, highlighting its essential role in phosphorus cycling under acidic conditions. In deeper soil layers, pH facilitates phosphorus mobilization from NLP pools, with effects varying across fractions. Long-term studies on Japanese soils reveal that pH and electrical conductivity (EC) management significantly promote NLP-to-LP conversion, primarily through NaOH-Po, thereby improving phosphorus use efficiency. These findings underscore the critical importance of prioritizing chemical property management over physical modifications to optimize nutrient cycling, preserve soil fertility, and reduce reliance on external phosphorus inputs in agricultural systems. Our study emphasizes the need for integrated approaches to achieve sustainable phosphorus management in both natural and managed ecosystems.
土壤中磷（P）的有效性常常受到其以非活性磷（NLP）形式积累的限制，从而限制了植物对其的获取。本研究考察了土壤物理性质、化学特征和气候条件如何影响磷的分级以及NLP向植物可利用的活性磷（LP）的转化。利用全球结构方程模型（SEM），我们发现粉粒含量会增加有机磷组分，包括碳酸氢钠提取态有机磷（NaHCO-Po）和氢氧化钠提取态有机磷（NaOH-Po）。在土壤上层30厘米处，pH值会降低NaHCO-Po和NaOH-Po的有效性，同时使NLP稳定，突出了其在酸性条件下磷循环中的重要作用。在更深的土壤层中，pH值促进了磷从NLP库中的活化，不同组分的影响各异。对日本土壤的长期研究表明，pH值和电导率（EC）管理显著促进了NLP向LP的转化，主要是通过NaOH-Po，从而提高了磷的利用效率。这些发现强调了在农业系统中优先进行化学性质管理而非物理改良对于优化养分循环、保持土壤肥力以及减少对外部磷输入的依赖至关重要。我们的研究强调了在自然和管理生态系统中采用综合方法实现可持续磷管理的必要性。
