Estimating FAPAR of Rice Growth Period Using Radiation Transfer Model Coupled with the WOFOST Model for Analyzing Heavy Metal StressReport as inadecuate


Estimating FAPAR of Rice Growth Period Using Radiation Transfer Model Coupled with the WOFOST Model for Analyzing Heavy Metal Stress


Estimating FAPAR of Rice Growth Period Using Radiation Transfer Model Coupled with the WOFOST Model for Analyzing Heavy Metal Stress - Download this document for free, or read online. Document in PDF available to download.

School of Information Engineering, China University of Geoscience, Beijing 100083, China





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Academic Editors: John S. Kimball, Kaiyu Guan, James Campbell and Prasad Thenkabail

Abstract Timely assessment of crop growth conditions under heavy metal pollution is of great significance for agricultural decision-making and estimation of crop productivity. The object of this study is to assess the effects of heavy metal stress on physiological functions of rice through the spatial-temporal analysis of the fraction of absorbed photosynthetically active radiation FAPAR. The calculation of daily FAPAR is conducted based on a coupled model consisting of the leaf-canopy radiative transfer model and World Food Study Model WOFOST. These two models are connected by leaf area index LAI and a fraction of diffused incoming solar radiation SKYL in the rice growth period. The input parameters of the coupled model are obtained from measured data and GF-1 images. Meanwhile, in order to improve accuracy of FAPAR, the crop growth model is optimized by data assimilation. The validation result shows that the correlation between the simulated FAPAR and the measured data is strong in the rice growth period, with the correlation coefficients being above 7.5 for two areas. The discrepancy of FAPAR between two areas of different stress levels is visualized by spatial-temporal analysis. FAPAR discrepancy starts to appear in the jointing-booting period and experiences a gradual rise, reaching its maximum in the heading-flowering stage. This study suggests that the coupled model, consisting of the leaf-canopy radiative transfer model and the WOFOST model, is able to accurately simulate daily FAPAR during crop growth period and FAPAR can be used as a potential indicator to reflect the impact of heavy metal stress on crop growth. View Full-Text

Keywords: FAPAR; coupled model; PROSAIL; WOFOST; heavy metal stress FAPAR; coupled model; PROSAIL; WOFOST; heavy metal stress





Author: Gaoxiang Zhou, Xiangnan Liu * , Shuang Zhao, Ming Liu and Ling Wu

Source: http://mdpi.com/



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