Messiga Aimé Jean, Ziadi Noura, Jouany Claire, Virkajärvi Perttu, Suomela Raija, Sinaj Sokrat, Bélanger Gilles, Stroia Ciprian, Morel Christian
Environmental and Resource Studies Program, Trent University, 1600 West Bank Drive, Peterborough, ON, K9J 7B8, Canada,
Ambio. 2015 Mar;44 Suppl 2(Suppl 2):S252-62. doi: 10.1007/s13280-015-0628-x.
We analyzed the linearity of relationships between soil test P (STP) and cumulative phosphorus (P) budget using data from six long-term fertilized grassland sites in four countries: France (Ercé and Gramond), Switzerland (Les Verrières), Canada (Lévis), and Finland (Maaninka and Siikajoki). STP was determined according to existing national guidelines. A linear-plateau model was used to determine the presence of deflection points in the relationships. Deflection points with (x, y) coordinates were observed everywhere but Maaninka. Above the deflection point, a significant linear relationship was obtained (0.33 < r (2) < 0.72) at four sites, while below the deflection point, the relationship was not significant, with a negligible rate of STP decrease. The relationship was not linear over the range of STP encountered at most sites, suggesting a need for caution when using the P budget approach to predict STP changes in grasslands, particularly in situations of very low P fertilization. Our study provides insights and description of a tool to improve global P strategies aimed at maintaining STP at levels adequate for grassland production while reducing the risk of P pollution of water.
我们利用来自四个国家六个长期施肥草地站点的数据，分析了土壤有效磷（STP）与累积磷（P）收支之间关系的线性，这四个国家分别是法国（埃尔塞和格拉蒙德）、瑞士（莱维耶尔）、加拿大（勒维）以及芬兰（马宁卡和锡卡约基）。STP是根据现有的国家指南测定的。采用线性-平台模型来确定这些关系中拐点的存在情况。除了马宁卡之外，在其他各个站点均观测到了具有（x, y）坐标的拐点。在拐点之上，四个站点获得了显著的线性关系（0.33 < r² < 0.72），而在拐点之下，该关系不显著，STP的下降速率可忽略不计。在大多数站点所遇到的STP范围内，这种关系并非线性，这表明在使用磷收支方法预测草地中STP的变化时需要谨慎，尤其是在低磷施肥的情况下。我们的研究提供了一种工具的见解和描述，以改进旨在将STP维持在足以支持草地生产的水平同时降低磷污染水体风险的全球磷策略。
