Application of scanning calorimetry to estimate soil organic matter loss after fires |
| |
Authors: | Sergey V Ushakov Divya Nag Alexandra Navrotsky |
| |
Institution: | (1) Peter A. Rock Thermochemistry Laboratory NEAT ORU, University of California at Davis, One Shields Ave, Davis, CA 95616, USA |
| |
Abstract: | The severe heating of soil during wildfires and prescribed burns may result in adverse effects on soil fertility due to organic
matter loss. No rapid and reliable procedure exists to evaluate soil organic matter (SOM) losses due to heating. Enthalpy
of SOM combustion correlates with organic matter content. Quartz is a ubiquitous mineral in soils and has a remarkably constant
composition and reversible α–β phase transition at 575 °C. We suggest that SOM content in heated and unheated soils can be
compared using the ratio of SOM combustion enthalpy on heating to the β–α quartz transition enthalpy measured on cooling of
the same sample. This eliminates the need to dry and weigh the samples, making possible field applications of the proposed
method. The feasibility of using the (ΔH
comb SOM)/(ΔH
β–α Qz) ratio was established with experiments on soil samples heated in the laboratory and the method was then used for evaluation
of SOM loss on two pile burn sites at UC Berkeley’s Blodgett Forest Research Station in Georgetown, California. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|