白洋淀沟壕系统水陆交错区生物质磷形态特征研究

利用液相³¹P核磁共振的分析方法，研究了白洋淀水陆交错区中生物质磷（Biogenic-P）的形态特征.结果表明：不同类型水陆交错区磷含量差异较大，水陆交错区中间土壤总磷（TP）含量最高，为1342.81~2444.90 mg·kg^-1；水陆交错区Biogenic-P含量为437.65~1309.20 mg·kg^-1，占TP含量的25.62%~60.26%；使用液相³¹P-NMR技术共检测到7类磷化合物，其中，Biogenic-P共计检测到6种，包括磷酸单酯（Mono-P）、DNA磷（DNA-P）、焦磷酸盐（Pyro-P）、磷脂（Lipids-P）、多聚磷酸盐（Poly-P）和膦酸盐（Phon-P）；水陆交错区Biogenic-P以Mono-P为主，含量为372.94~1086.96 mg·kg^-1，TP含量平均值是全国土壤磷含量平均值的3.41倍；水陆交错区界面土壤与中间土壤相较沉积物和边缘土壤Biogenic-P含量更高；从水陆交错区的中间土壤到沉积物，Biogenic-P含量变化趋势与总有机质（OM）含量变化趋势相反.基于液相³¹P核磁共振技术，本文对白洋淀沟壕系统水陆交错区中Biogenic-P形态特征与分布提出了新的认识，有助于深入理解水陆交错区磷的生物地球化学循环过程，为流域磷输入的控制提供理论支撑.

Morphological characteristics of biogenic phosphorus in aquatic-terrestrial ecotone of Baiyangdian

The morphological characteristics of biogenic phosphorus (Biogenic-P) in aquatic-terrestrial ecotone of Baiyangdian were studied by solution phosphorus nuclear magnetic resonance (³¹P-NMR). The results showed that the phosphorus (P) concentration in aquatic-terrestrial ecotone varied greatly in different geographical regions, the highest total phosphorus (TP) concentration was found in the soil from the middle of aquatic-terrestrial ecotone, which ranged from 1342.81 to 2444.90 mg·kg^-1. The content of biogenic-P in aquatic-terrestrial ecotone was between 437.65 to 1309.20 mg·kg^-1, accounting for 25.62% to 60.26% of the TP content. Seven kinds of P compounds were detected in aquatic-terrestrial ecotone by ³¹P-NMR, among which, six kinds of P compounds were detected in biogenic-P including phosphate monoesters (Mono-P), deoxyribonucleic acid (DNA-P), pyrophosphate (Pyro-P), phospholipids (Lipids-P), polyphosphate (Poly-P) and phosphonates (Phon-P). Mono-P was the main component of biogenic-P in aquatic-terrestrial ecotone, with the concentration ranged from 372.94 to 1086.96 mg·kg^-1. Biogenic-P was dominated by Mono-P in aquatic-terrestrial ecotone, with the concentration between 372.94 and 1086.96 mg·kg^-1. The average TP concentration in aquatic-terrestrial ecotone was 3.41 times higher than the national average soil P content. The concentration of biogenic-P in the interface and intermediate soils in aquatic-terrestrial ecotone was higher than that in the sediment and marginal soil. From the soil in the interlaced area to the sediments in aquatic-terrestrial ecotone, the variations of biogenic-P concentration showed the opposite tendency compared with OM. Based on the solution ³¹P-NMR technology, this paper offers some new understanding on the morphological characteristics and distribution of biogenic-P in aquatic-terrestrial ecotone of the Baiyangdian, which will help to understand the phosphorus biogeochemical cycle process in aquatic-terrestrial ecotone and provide theoretical support for the control of phosphorus input to the basin.