干旱区生态环境知识资源中心(Arid): Realistic and simplified models of plant and leaf area indices for a seasonally dry tropical forest

Arid

DOI	10.1016/j.jag.2019.101992
	Realistic and simplified models of plant and leaf area indices for a seasonally dry tropical forest
	Miranda, Rodrigo de Queiroga 1; Nobrega, Rodolfo Luiz Bezerra 2,3; Beserra de Moura, Magna Soelma 2,4; Raghavan, Srinivasan 5; Galvincio, Josicleda Domiciano 1
通讯作者	Miranda, Rodrigo de Queiroga
来源期刊	INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
ISSN	0303-2434
出版年	2020
卷号	85
英文摘要	Leaf Area Index (LAI) models that consider all phenological stages have not been developed for the Caatinga, the largest seasonally dry tropical forest in South America. LAI models that are currently used show moderate to high covariance when compared to in situ data, but they often lack accuracy in the whole spectra of possible values and do not consider the impact that the stems and branches have over LAI estimates, which is of great influence in the Caatinga. In this study, we develop and assess PAI (Plant Area Index) and LAI models by using ground-based measurements and satellite (Landsat) data. The objective of this study was to create and test new empirical models using a multi-year and multi-source of reflectance data. The study was based on measurements of photosynthetic photon flux density (PPFD) from above and below the canopy during the periods of 2011-2012 and 2016-2018. Through iterative processing, we obtained more than a million candidate models for estimating PAI and LAI. To dean up the small discrepancies in the extremes of each interpolated series, we smoothed out the dataset by fitting a logarithmic equation with the PAI data and the inverse contribution of WAI (Wood Area Index) to PAL that is the portion of PAI that is actually LAI (LAI(C)). LAI(C) can be calculated as follows: LAI(C) = 1 - (WAI/PAI)). We subtracted the WAI values from the PAI to develop our in situ LAI dataset that was used for further analysis. Our in situ dataset was also used as a reference to compare our models with four other models used for the Caatinga, as well as the MODIS-derived LAI products (MCD15A3H/A2H). Our main findings were as follows: (i) Six models use NDVI (Normalized Difference Vegetation Index), SAVI (Soil-Adjusted Vegetation Index) and EVI (Enhanced Vegetation Index) as input, and performed well, with r(2) ranging from 0.77 to 0.79 (PAI) and 0.76 to 0.81 (LAI), and RMSE with a minimum of 0.41 m(2) m(-2) (PAI) and 0.40 m(2) m(-2) (LAI). The SAVI models showed values 20% and 32% (PAI), and 21% and 15% (LAI) smaller than those found for the models that use EVI and NDVI, respectively; (ii) the other models (ten) use only two bands, and in contrast to the first six models, these new models may abstract other physical processes and components, such as leaves etiolation and increasing protochlorophyll. The developed models used the near-infrared band, and they varied only in relation to the inclusion of the red, green, and blue bands. (iii) All previously published models and MODIS-LAI underperformed against our calibrated models. Our study was able to provide several PAI and LAI models that realistically represent the phenology of the Caatinga.
英文关键词	Caatinga Landsat Phenology Semi-arid Woody Area Index Leaf Area Index
类型	Article
语种	英语
国家	Brazil ; England ; USA
开放获取类型	Green Published, Green Submitted, gold
收录类别	SCI-E
WOS记录号	WOS:000501621200013
WOS关键词	SEMIARID REGION ; LAI ; CAATINGA ; MODIS ; SOIL ; EVAPOTRANSPIRATION ; ECOSYSTEMS ; PARAMETERS ; SCATTERING ; PHENOLOGY
WOS类目	Remote Sensing
WOS研究方向	Remote Sensing
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314742
作者单位	1.Univ Fed Pernambuco, Lab Sensoriamento Remoto & Geoproc, BR-50670901 Recife, PE, Brazil; 2.Univ Reading, Dept Geog & Environm Sci, Reading RG6 6AH, Berks, England; 3.Imperial Coll London, Dept Life Sci, Ascot SL5 7PY, Berks, England; 4.Brazilian Agr Res Corp, Embrapa Trop Semiarid, BR-56302970 Petrolina, PE, Brazil; 5.Texas A&M Univ, Spatial Sci Lab, College Stn, TX 77845 USA
推荐引用方式 GB/T 7714	Miranda, Rodrigo de Queiroga,Nobrega, Rodolfo Luiz Bezerra,Beserra de Moura, Magna Soelma,et al. Realistic and simplified models of plant and leaf area indices for a seasonally dry tropical forest[J],2020,85.
APA	Miranda, Rodrigo de Queiroga,Nobrega, Rodolfo Luiz Bezerra,Beserra de Moura, Magna Soelma,Raghavan, Srinivasan,&Galvincio, Josicleda Domiciano.(2020).Realistic and simplified models of plant and leaf area indices for a seasonally dry tropical forest.INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION,85.
MLA	Miranda, Rodrigo de Queiroga,et al."Realistic and simplified models of plant and leaf area indices for a seasonally dry tropical forest".INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION 85(2020).