期刊
REMOTE SENSING OF ENVIRONMENT
卷 115, 期 1, 页码 227-232出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.rse.2010.08.022
关键词
Synthetic aperture radar; L-band; Biomass; Soil moisture
资金
- National Aeronautics and Space Administration [NNG04GR24G]
- Spanish Ministry of Science and Education
- FPI [BES-2006-11684]
- Direct For Biological Sciences
- Division Of Environmental Biology [1026415] Funding Source: National Science Foundation
A study was carried out to investigate the utility of L-band SAR data for estimating aboveground biomass in sites with low levels of vegetation regrowth. Data to estimate biomass were collected from 59 sites located in fire-disturbed black spruce forests in interior Alaska. PALSAR L-band data (HH and HV polarizations) collected on two dates in the summer/fall of 2007 and one date in the summer of 2009 were used. Significant linear correlations were found between the log of aboveground biomass (range of 0.02 to 22.2 t ha(-1)) and sigma degrees (L-HH) and sigma degrees (L-HV) for the data collected on each of the three dates, with the highest correlation found using the L-HV data collected when soil moisture was highest. Soil moisture, however, did change the correlations between L-band sigma degrees and aboveground biomass, and the analyses suggest that the influence of soil moisture is biomass dependent. The results indicate that to use L-band SAR data for mapping aboveground biomass and monitoring forest regrowth will require development of approaches to account for the influence that variations in soil moisture have on L-band microwave backscatter, which can be particularly strong when low levels of aboveground biomass occur. (C) 2010 Elsevier Inc. All rights reserved.
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