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Spectral Reflectance of Wheat Residue during Decomposition and Remotely Sensed Estimates of Residue Cover
USDA-ARS Hydrology and Remote Sensing Laboratory, 10300 Baltimore Avenue, Beltsville, MD 20705, USA
ASRC Management Services, USDA-FAS Office of Global Analysis, Washington, DC, 20250, USA
USDA-ARS Environmental Management and Byproduct Utilization Laboratory, Beltsville, MD 20705, USA
* Author to whom correspondence should be addressed.
Received: 23 December 2009; in revised form: 20 January 2010 / Accepted: 21 January 2010 / Published: 27 January 2010
Abstract: Remotely sensed estimates of crop residue cover (fR) are required to assess the extent of conservation tillage over large areas; the impact of decay processes on estimates of residue cover is unknown. Changes in wheat straw composition and spectral reflectance were measured during the decay process and their impact on estimates of fR were assessed. Proportions of cellulose and hemicellulose declined, while lignin increased. Spectral features associated with cellulose diminished during decomposition. Narrow-band spectral residue indices robustly estimated fR, while broad-band indices were inconsistent. Advanced multi-spectral sensors or hyperspectral sensors are required to assess fR reliably over diverse agricultural landscapes.
Keywords: crop residue cover; lignin; cellulose; reflectance spectra; cellulose absorption index; decomposition; plant litter
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Daughtry, C.S.T.; Serbin, G.; Reeves, J.B., III; Doraiswamy, P.C.; Hunt, E.R., Jr. Spectral Reflectance of Wheat Residue during Decomposition and Remotely Sensed Estimates of Residue Cover. Remote Sens. 2010, 2, 416-431.
Daughtry CST, Serbin G, Reeves JB, III, Doraiswamy PC, Hunt ER, Jr. Spectral Reflectance of Wheat Residue during Decomposition and Remotely Sensed Estimates of Residue Cover. Remote Sensing. 2010; 2(2):416-431.
Daughtry, Craig S. T.; Serbin, Guy; Reeves, James B., III; Doraiswamy, Paul C.; Hunt, Earle Raymond, Jr. 2010. "Spectral Reflectance of Wheat Residue during Decomposition and Remotely Sensed Estimates of Residue Cover." Remote Sens. 2, no. 2: 416-431.