气候变化领域集成服务门户(CCPortal): Vegetation optical depth at L-band and above ground biomass in the tropical range: Evaluating their relationships at continental and regional scales

CCPortal

DOI	10.1016/j.jag.2019.01.006
	Vegetation optical depth at L-band and above ground biomass in the tropical range: Evaluating their relationships at continental and regional scales
	Vittucci C.; Vaglio Laurin G.; Tramontana G.; Ferrazzoli P.; Guerriero L.; Papale D.
发表日期	2019
ISSN	15698432
起始页码	151
结束页码	161
卷号	77
英文摘要	The relationship between vegetation optical depth (VOD) retrieved by L-band SMOS radiometer and forest above ground biomass (AGB) was investigated in tropical areas of Africa and South America. VOD was retrieved from the latest version of level 2 SMOS algorithm, while reference AGB was obtained from a pantropical database, encompassing a large number of ground plot data derived from field surveys conducted on both continents. In Africa and South-America, VOD increased with AGB, reaching saturation at about 350 Mg ha −1 . The strength of the relation was improved selecting VOD data in appropriate seasons, characterized by a higher dynamic range of values. The capability of VOD data to estimate AGB was further investigated using Random Forest decision trees, adding to VOD selected climate variables from the Climatic Research Unit (temperature, potential evapotranspiration, and precipitation) and water deficit data, and validating regression tests with ground data from the reference AGB database. The results for the five analyzed years indicate that the best estimates of AGB are obtained by the joined use of VOD and potential evapotranspiration input data, but all climate variables brought an improvement in AGB estimates. AGB estimates were relatively stable for the considered period, with limited variations possibly due to changes in biomass and to data quality of VOD and of climate variables. The VOD signal and estimated AGB were also analyzed according to ecological homogeneous units (ecoregions), evidencing data clusters, partially overlapped to each other, in the VOD - AGB plane. © 2019 The Authors
英文关键词	Biomass; Ecofunctional properties; Forests; SMOS
语种	英语
scopus关键词	aboveground biomass; evapotranspiration; optical depth; radiometer; SMOS; tropical region; vegetation dynamics; Africa; South America
来源期刊	International Journal of Applied Earth Observation and Geoinformation
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156508
作者单位	University of Rome Tor Vergata, DICII, Rome, Italy; Tuscia University, DIBAF, Viterbo, Italy
推荐引用方式 GB/T 7714	Vittucci C.,Vaglio Laurin G.,Tramontana G.,et al. Vegetation optical depth at L-band and above ground biomass in the tropical range: Evaluating their relationships at continental and regional scales[J],2019,77.
APA	Vittucci C.,Vaglio Laurin G.,Tramontana G.,Ferrazzoli P.,Guerriero L.,&Papale D..(2019).Vegetation optical depth at L-band and above ground biomass in the tropical range: Evaluating their relationships at continental and regional scales.International Journal of Applied Earth Observation and Geoinformation,77.
MLA	Vittucci C.,et al."Vegetation optical depth at L-band and above ground biomass in the tropical range: Evaluating their relationships at continental and regional scales".International Journal of Applied Earth Observation and Geoinformation 77(2019).