新型高效磷肥的研发是从根本上解决当前农学与土壤环境学发展瓶颈的新思路。有机结合态磷肥施入土壤后抗固定性能强，反应活性高，是当今磷肥改性增效技术发展的主流方向。阐明有机结合态磷肥输入土壤后的归趋特征及赋存形态转化，对提高磷肥利用率、降低农田磷素富集及农业面源污染至关重要。但目前该方面的研究尚不多见。本项目拟基于室内模拟盆栽试验，利用磷-33同位素示踪技术追踪有机结合态磷肥在土壤不同活性磷库-微生物-作物系统中量化归趋的时空特征，结合液相磷-31核磁共振、同步辐射X射线吸收近边结构谱（bulk/μ-XANES）、微区X射线荧光光谱（μ-XRF）等前沿技术从分子水平上表征有机肥料磷初始形态及施入土壤后赋存形态的转化特征，揭示有机结合态磷肥高效性的深层机制，为农业可持续发展、农田土壤磷素优化管理、农业面源污染减排提供前瞻性理论依据。

Developing new phosphorus (P) fertilizers with enhanced property and function is a fundamental way to solve the current bottleneck problems within the agronomy and soil-environmental science. Organically-bonded P fertilizers with low sorption capacity show high activity and mobility in soils after application, and thus become popular in the field of enhanced P fertilizer development. Clarifying the fate and turnover of organically-bonded P fertilizers in soils after application is critical to improve fertilizer efficiency, decrease soil P accumulation, and control agricultural non-point pollution. However, research in this field is not well-documented until now. In this program based on pot experiment, we intend to measure the distribution of organically-bounded P fertilizers between the soil labile/non-labile P fractions, growing crops and microbial P pools as well as its spatial-temporal features by P-33 isotope tracer technique. Cutting-edge spectroscopes at the molecular level, including P-31 NMR, bulk/μ-XANES, μ-XRF, are combined to probe P speciation of organically-bonded P fertilizer, as well as the P turnover and transformation after its application. Results will reveal the deep mechanisms of the enhanced efficiency for the organically-bonded P fertilizers, which provide forward-looking basis for sustainable development of agriculture, optimized management of agricultural soil P, and controlled agricultural non-point source discharge.