Using Diffuse Reflectance Spectroscopy to Quantify and Predict Soil Carbon Content in Agricultural Soils of Hawai'i
In Hawai‘i there is an increasing demand for techniques that can quantify soil carbon (C) over space and time to assess changes in fertility and C sequestration with changes in management. However, traditional analysis required for accurate assessment of soil C is so time-consuming and expensive that it limits the degree to which this variability can be characterized. Thus, there is a need for new techniques to measure C. Visible/near-infrared (VNIR)- and mid-infrared (MIR)-diffuse reflectance spectroscopy (DRS) has the potential to revolutionize soil monitoring by allowing for samples to be scanned rapidly, inexpensively, and non-destructively. The spectra can be related to laboratory measurements of C with chemometrics. This allows for better characterization of soil C across Hawai‘i’s agroecosystems. Thus, our project objectives are to:
The project tests two hypotheses:
Peer-reviewed Publications: (in progress)
Oral and poster presentations:
McDowell M.L., G.L. Bruland, J.L. Deenik, S. Grunwal and R.S. Uchida. 2010. Diffuse reflectance spectroscopy for total carbon analysis of Hawaiian soils. American Geophysical Union (AGU) Meeting, San Francisco, CA, Dec. 13-17, 2010.
Bruland G.L., M.L. McDowell, J. Deenik, R. Uchida and S. Grunwald. 2010. Using Diffuse Reflectance Spectroscopy to Assess Soil Total Carbon in Agricultural Soils of Hawaii and Other Pacific Islands. ASA-CSSA-SSSA Meeting, Long Beach, CA, Oct. 31- Nov. 4, 2010.