Soil nutrient stoichiometry impacts on soil organic carbon stocks in long-term phosphorus fertilisation experiments

作者：Parag Bhople, David P. Wall, Karl G. Richards, Timothy J. Clough, Fiona Brennan, Gary Lanigan, Mart Ros, Anke M. Herrmann, Ingeborg Frøsig Pedersen, Lars Elsgaard, Naoise Nunan, Christoph Müller, Kristina Kleineidam, Sergio E. Morales, Daniel S. Goll, Giulia Bondi · 发表于：Geoderma · 年份：2025 · DOI：10.1016/j.geoderma.2025.117538 · 被引用次数：4 · 研究领域：Soil Carbon and Nitrogen Dynamics、Soil and Water Nutrient Dynamics、Soil Geostatistics and Mapping

Managing agroecosystems to enhance soil organic carbon (SOC) storage is important for mitigating climate change. However, the transformation of SOC is intimately connected to nutrient cycling, particularly nitrogen (N) and phosphorus (P). While P constraints on plant growth are known, their effects on carbon (C) and N cycling remain uncertain. The study uses several long-term experiments (LTEs) to determine the importance of N-P interactions and the optimal C:N:P stoichiometry for long-term SOC stocks in managed agricultural systems. The aim was to determine the influence of multi-decadal P fertilisation on SOC stocks and stoichiometric interactions of C, N and P in agricultural soils (up to 50 cm) across different soil textural classes and land uses. For this, the soils were sampled at three depths 0–10, 10–30 and 30–50 cm from six LTEs in Europe (three grasslands and three arables) to determine soil physico-chemical properties. The results showed comparable SOC stocks in contrasting P treatments across land uses. In grasslands, SOC stocks at 0–50 cm depth ranged from 9.7 to 40.6 t C ha −1 while in arable sites, they were between 11.0 and 48.3 t C ha −1 . The SOC stocks did not vary significantly across P treatments indicating that long-term P fertilisation did not affect C storage. Grassland sites had higher SOC stocks in the 0–10 cm, while at arable sites they were higher at 10–30 cm depths. The maximum predicted SOC stock of 30.9 t C ha −1 was with SOC/TN (total nitrogen)...