Stable Isotopes and Bayesian Modeling Methods of Tracking Sources and Differentiating Bioavailable and Recalcitrant Phosphorus Pools in Suspended Particulate Matter
Stable Isotopes and Bayesian Modeling Methods of Tracking Sources and Differentiating Bioavailable and Recalcitrant Phosphorus Pools in Suspended Particulate Matter
复制标题
DOI：
10.1021/acs.est.8b05057
复制
发表时间：
2019-01-01
影响因子：
11.4
通讯作者：
Jaisi, Deb P.
中科院分区：
文献类型：
--
作者：
Mingus, Kristi A.;Liang, Xiaomeng;Jaisi, Deb P.
由于缺乏合适的方法，对流域内不同磷库的来源及其生物有效性的认识受到限制。在这项研究中，磷酸盐氧同位素比值和贝叶斯建模的指纹元素作为两种新的方法，以确定来源和相对悬浮在水中的颗粒P池的连续性，从陆地到口的沿海河口切萨皮克湾。颗粒磷库的大小，相对比例和氧同位素值的比较分析表明，碳酸氢钠-磷库的生物有效性，而氢氧化钠-磷和盐酸-磷库的磷迁移沿着小溪。农田土壤，河岸，河流底部沉积物的颗粒P的主要来源和他们的贡献显着变化的上游和下游地区的小溪。贝叶斯模型的基础上指纹元素表明，潮汐在形成颗粒物的河口来源在河口地区和进口上游发挥了重要作用。这些研究结果提供了新的见解的起源和命运的颗粒P和保真度的同位素和指纹方法在源跟踪的P在潮汐影响的流域。
Understanding the sources of different phosphorus (P) pools and their bioavailability under imposed biogeochemical environments in a watershed is limited largely due to the lack of appropriate methods. In this research, phosphate oxygen isotope ratios and Bayesian modeling on fingerprinting elements were applied as two novel methods to identify sources and relative recalcitrancy of particulate P pools suspended in water in the continuum of sources from land to the mouth of a coastal estuary to the Chesapeake Bay. Comparative analyses of sizes, relative ratios, and oxygen isotope values of particulate P pools in the creek water suggested that the NaHCO3-P pool was bioavailable, whereas NaOH-P and HCl-P pools were recalcitrant during P transport along the creek. Agricultural field soil, streambank, and river bottom sediments were major sources of particulate P and their contributions varied significantly at the headwater and downstream regions of the creek. Bayesian modeling based on fingerprinting elements suggested that tides played a major role in forming particulate matter from estuarine sources at the creek mouth region and importing it upstream. These findings provide new insights into the origin and fate of particulate P and the fidelity of isotope and fingerprinting methods in source tracking of P in tidally influenced watersheds.