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首页»科研成果» 2015
刘强与合作者在 BIOSYSTEMS ENGINEERING 上发表论文
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Modelling of fraction of absorbed photosynthetically active radiation
Rongyuan Liua, b, Huazhong Rena, d,*, Suhong Liua, Qiang Liuc, Xiaowen Lia
a State Key Laboratory of Remote Sensing Science, School of Geography, Beijing Normal University, Beijing 100875, China b Beijing Research Center for Information Technology in Agriculture, Beijing 100097, China c College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China d ICube Laboratory, Université de Strasbourg, CNRS, Boulevard Sébastien Brant, BP10413, 67412 Illkirch, France
ABSTRACT The Fraction of Absorbed Photosynthetically Active Radiation (FPAR) has been identified as one of the key parameters in calculating ecosystem productivity. The objective of this paper is to model the vertical profile of FPAR in the canopy using a radiative transfer model, the Modified Simultaneous Heat and Water (MSHAW) radiation model. Model analysis indicated that the vertical distribution of the canopy FPAR was dependent on the leaf area index (LAI), average leaf orientation angle (ALA), solar position, and sky conditions. In the validation of the MSHAW model with three varieties of wheat leaf profile at different growth stages, two parabolic functions were developed to approximately reconstruct the shape of the wheat leaf for the first time and, consequently, the vertical profiles of LAI and ALA used to drive the MSHAW model were estimated. The validation results indicated that the estimated FPAR was close to the measurements made with the SunScan canopy analysis system with an RMSE of approximately 0.15 for the continuous canopy. Finally, this paper also discusses a promising method to perform time normalisation on canopy FPAR data using multiple temporal remotely sensed data observations and to retrieve FPAR from remotely sensed data based on the analysis of the MSHAW model.
KEY WORDS: FPAR, Radiative transfer model, Vertical profile, MSHAW
PUBLISHED BY: BIOSYSTEMS ENGINEERING, 2015,133 81-94; 10.1016 SOURCE: http://www.sciencedirect.com/science/article/pii/S1537511015000422 |
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