School of Resources, Environment and Architectural Engineering, Chifeng University, Chifeng 024000, Inner Mongolia, China.
Academy of Agricultural Sciences, Chifeng University, Chifeng 024000, Inner Mongolia, China.
Ying Yong Sheng Tai Xue Bao. 2021 Nov 15;32(11):4004-4010. doi: 10.13287/j.1001-9332.202111.028.
Soil phosphorus (P) could be categorized into organic and inorganic forms, with diffe-rent capabilities of nutrient supply. Exploring soil P components through liquid P-NMR would provide an important theoretical basis for soil P nutrition regulation. This study addressed the characteristic of P in alfalfa (Medicago sativa) soil via the pot experiment. There were two scenarios of treatments with conventional and dry water combined with different P fertilizer levels (P-P: 0, 0.025, 0.05, 0.1, and 0.2 g PO·kgsoil). The characteristics of P components in alfalfa soil under water-fertilizer coupling conditions were measured by liquid P-NMR. Results showed that under different water and fertilizer treatments, soil inorganic P was mainly composed of inorganic orthophosphate, pyrophosphate and inorganic polyphosphate. Inorganic orthophosphate was the dominant component of inorganic P, which could be reduced by drought. High P application (P) could increase the contents of soil inorganic polyphosphates and inorganic pyrophosphates. Among the organic P components, monoester orthophosphate was dominant, the conversion and utilization of which in alfalfa soil were affected by drought. Overall, the rational management of water and fertilizer could effectively regulate the conversion and utilization of P nutrients in alfalfa soil in Eastern Inner Mongolia.
土壤磷（P）可分为有机和无机形式，具有不同的养分供应能力。通过液体 P-NMR 探索土壤 P 成分将为土壤 P 营养调节提供重要的理论基础。本研究通过盆栽试验探讨了紫花苜蓿（Medicago sativa）土壤 P 的特征。有两种处理方案，分别是常规处理和干水结合不同磷肥水平（P-P：0、0.025、0.05、0.1 和 0.2 g PO·kgsoil）。通过液体 P-NMR 测量水肥耦合条件下紫花苜蓿土壤中 P 成分的特征。结果表明，在不同水肥处理下，土壤无机 P 主要由无机正磷酸盐、焦磷酸盐和无机多磷酸盐组成。无机正磷酸盐是无机 P 的主要成分，干旱会降低其含量。高 P 施用量（P）会增加土壤无机多磷酸盐和无机焦磷酸盐的含量。在有机 P 成分中，单酯正磷酸盐占主导地位，其在紫花苜蓿土壤中的转化和利用受干旱影响。总的来说，水肥的合理管理可以有效调节内蒙古东部紫花苜蓿土壤中 P 养分的转化和利用。
