CAREER:Mineralogical and Biogeochemical Control of Phosphorus Transformation during Soil Development

职业：土壤发育过程中磷转化的矿物学和生物地球化学控制

• 批准号: 1752903
• 负责人: Mengqiang Zhu
• 金额: $ 67.62万
• 依托单位: University of Wyoming
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-08-15 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1752903&HistoricalAwards=false
• 关键词: CAREER; Mineralogical; Biogeochemical; Control; Phosphorus

Phosphorus (P) cycling and bioavailability in soils shapes ecosystem structure and function. At a given soil developmental stage during soil formation, the P chemical composition provides a useful context for evaluating contemporary cycling of P, carbon and other nutrients, and for determining how changes in P availability might affect diverse ecosystem processes, such as primary productivity. In this project, the PI and his team will address transformation of P composition in soils and its coupling to organic carbon cycling during long-term ecosystem development. The proposed work will transform the current understanding of P dynamics and its coupling to carbon cycling in terrestrial ecosystems. This work also has important implications for P utilization in agriculture and will advance the understanding of P fate after P fertilizer application. The proposed education work will have broad impacts on Earth Science education of various levels of students in the state of Wyoming through developing courses, curriculum and STEM activities, and preparing earth science teachers. The research, education and outreach components of this proposal have been developed synergistically to maximize the impact on the PI's, as well as existing on-campus outreach organizations.The well-received Walker and Syers model describing P transformation during pedogenesis or soil development is based on operationally-defined P fractions as measured by chemical extractions, rather than P speciation. Thus, it has significant limitations in describing P biogeochemical transformation involving P interactions with minerals and organics. Moreover, the model was developed from humid environment and has limited applicability to semi-arid ecosystems as the model does not consider aeolian dust deposition as another important P input in the semi arid environment. There is, therefore, a great need to develop P speciation-based models that can accurately describe P transformation in both humid and semi-arid ecosystems. In this project, P X-ray absorption spectroscopy will be used to determine P speciation in soils, the P pools of the Walker and Syers model, and aeolian dust. Chronosequences in contrasting climate conditions and/or parent materials will be examined. A P-speciation based transformation model during ecosystem development will be proposed. To gain insights into coupled cycling of organic P and carbon facilitated by interacting with minerals, P speciation in soil organic matter associated with soil particles of different size regimes will be characterized using spectroscopic and biochemical analyses. Results are expected to have significant implications for understanding P cycling and bioavailability in terrestrial ecosystems.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

土壤中磷的循环和生物有效性决定了生态系统的结构和功能。在土壤形成过程中的特定土壤发育阶段，磷化学成分为评估当代磷、碳和其他养分的循环，以及确定磷有效性的变化如何影响不同的生态系统过程（如初级生产力）提供了有用的背景。在这个项目中，PI和他的团队将研究土壤中磷成分的转变及其在长期生态系统发展过程中与有机碳循环的耦合。这项工作将改变目前对陆地生态系统中磷动力学及其与碳循环耦合的理解。该研究对农业磷的利用也具有重要意义，并将促进对磷肥施用后磷命运的认识。拟议的教育工作将通过开发课程、课程和STEM活动，以及培养地球科学教师，对怀俄明州各级学生的地球科学教育产生广泛的影响。该提案的研究、教育和外展部分已经协同发展，以最大限度地影响PI，以及现有的校园外展组织。广受欢迎的Walker和Syers模型描述了土壤形成或土壤发育过程中的磷转化，该模型基于可操作定义的磷组分，通过化学提取来测量，而不是磷的形态。因此，在描述磷与矿物和有机物相互作用的生物地球化学转化时存在明显的局限性。此外，该模型是在湿润环境下发展起来的，由于模型没有考虑到半干旱环境下风沙沉积作为另一个重要的磷输入，因此对半干旱生态系统的适用性有限。因此，迫切需要建立基于物种的模型，以准确描述湿润和半干旱生态系统中磷的转化。在这个项目中，P x射线吸收光谱将用于确定土壤中P的形态，Walker和Syers模型中的P库以及风沙。对比气候条件和/或母材的时间序列将被检查。提出了一种基于p -物种形成的生态系统发展转化模型。为了深入了解有机磷和碳通过与矿物质相互作用促进的耦合循环，将使用光谱和生化分析来表征与不同粒径土壤颗粒相关的土壤有机质中磷的形态。研究结果对理解陆地生态系统中磷循环和生物可利用性具有重要意义。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Fate and availability of dust-borne phosphorus in a sub-humid temperate forest

• DOI: 10.1016/j.chemgeo.2021.120628
• 发表时间: 2021-11
• 期刊: Chemical Geology
• 影响因子: 3.9
• 作者: Zhuo‐Jun Zhang;Hairuo Mao;Zhiqi Zhao;Shilu Wang;Cong-Qiang Liu;Yongfeng Hu;Mengqian Zhu

Aeolian dust deposition and the perturbation of phosphorus transformations during long-term ecosystem development in a cool, semi-arid environment

• DOI: 10.1016/j.gca.2018.12.017
• 发表时间: 2019-02-01
• 期刊: GEOCHIMICA ET COSMOCHIMICA ACTA
• 影响因子: 5
• 作者: Gu, Chunhao;Hart, Stephen C.;Zhu, Mengqiang
• 通讯作者: Zhu, Mengqiang

Quantifying Uncertainties in Sequential Chemical Extraction of Soil Phosphorus Using XANES Spectroscopy

• DOI: 10.1021/acs.est.9b05278
• 发表时间: 2020-02-18
• 期刊: ENVIRONMENTAL SCIENCE & TECHNOLOGY
• 影响因子: 11.4
• 作者: Gu, Chunhao;Dam, Than;Zhu, Mengqiang
• 通讯作者: Zhu, Mengqiang

Vertical patterns of phosphorus concentration and speciation in three forest soil profiles of contrasting climate

• DOI: 10.1016/j.gca.2021.07.002
• 发表时间: 2021-10
• 期刊: Geochimica et Cosmochimica Acta
• 影响因子: 5
• 作者: Zhuo‐Jun Zhang;Zhiqi Zhao;Cong-Qiang Liu;O. Chadwick;C. Liang;Yongfeng Hu;K. Vaughan;M. Zhu