基于液相31P核磁共振技术的不同地理区域湖泊沉积物生物质磷(Biogenic-P)形态特征研究

利用液相~(31)P核磁共振分析方法,研究了我国不同地理区域湖泊表层沉积物中生物质磷(Biogenic-P)的形态特征.结果表明,不同地理区域湖泊表层沉积物磷含量差异较大,湖泊沉积物中的总磷在184.37～1089.41 mg·kg~(-1)之间,青藏高原的青海湖总磷含量最高,达到1089.41 mg·kg~(-1).使用~(31)P-NMR技术在湖泊沉积物中共检测到4类磷化合物,其中生物质磷检测到3类磷化合物,分别为:磷酸单酯(Mono-P)、DNA磷(DNA-P)、焦磷酸盐(Pyro-P),其中以磷酸单酯为主,含量在5.57～399.18 mg·kg~(-1)之间.随着我国外源性磷的有效控制,内源性磷成为了磷主要的来源,在磷的内源负荷中,生物质磷矿化释放的磷将会影响水体整体生产力,本研究基于液相~(31)P核磁共振技术,对我国不同区域湖泊沉积物中磷形态的分布有了一些新的认识,可为深入认识磷在不同区域湖泊中转化提供支持,有助于深入研究不同区域湖泊磷生物地球化学循环过程,同时为认识我国不同区域湖泊沉积物中磷形态特征提供数据支持.

Morphological characteristics of Biomass phosphorus (Biogenic-P) in lake sediments in different geographic regions based on liquid 31P nuclear magnetic resonance spectroscopy

The morphological characteristics of biogenic phosphorus (Biogenic-P) in surface sediments of lakes in different geographical regions of China were studied by liquid ³¹P-NMR. The results show that the contents of phosphorus in lake sediments varied greatly in different geographical regions. The total phosphorus in lake sediments ranged from 184.37~1089.41 mg·kg^-1.The total phosphorus content of Qinghai Lake Tibetan Plateau is the highest, reaching 1089.41 mg·kg^-1. Four kinds of phosphorus compounds were detected in lake sediments by ³¹P-NMR. Among them, three kinds of phosphorus compounds were detected in biomass phosphorus, namely, Mono-P, DNA-P and Pyro-P. The content of phosphorus monoester was mainly 5.57~399.18 mg·kg^-1.With the effective control of exogenous phosphorus, endogenous phosphorus has become the main source of phosphorus in the water column. In the endogenous load of phosphorus, the phosphorus released by the mineralization of biomass phosphorus will affect the overall productivity of water. Based on Liquid ³¹P NMR technology, we have some new understandings of the distribution of phosphorus forms in lake sediments in different regions of China, which can provide insights in understanding the transformation of phosphorus in lakes, and help to further study the phosphorus bio-earth of lakes. Meanwhile, it helps to understand the phosphorus biogeochemical cycle in lakes and to provide data support for understanding the phosphorus morphological characteristics in lake sediments.