Molecular Characterization of Dissolved Organic Matter from High Altitude Meadow Soils
EMSL Project ID
51025
Abstract
Floor-irrigated high-altitude meadows in the Rocky Mountains are important agroecosystems for hay production. However, the soil has a high nitrogen (N) fixation capability due to high C/N ratios, resulting in low nitrogen fertilization efficiency. The N in the soils mainly exists at organic N (ON) and improving the mineralization of ON through soil management is one of the strategies to reduce the use of N fertilizer. The information on molecular composition of OC and ON is useful to develop an effective management practice. Dissolved organic N, which is also mineralizable N, is part of dissolved organic matter (DOM) and an important indicator of the capacity of the soil to supply N for crops. In this proposal, the PI proposed to determine the molecular composition of four DOM samples extracted from meadow soils using 12-Tesla FT-ICR-MS. The analysis is focused on dissolved ON so that positive atmospheric pressure photoionization (+ APPI) needs to be used rather than electrospray ionization (ESI). The data will be used as preliminary results for a USDA proposal which the PI is developing with his collaborators and will be submitted by August 1, 2019.
Project Details
Project type
Limited Scope
Start Date
2019-07-24
End Date
2019-09-23
Status
Closed
Released Data Link
Team
Principal Investigator