期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2009
卷号：XXXVIII-8/W3
页码：256
出版社：Copernicus Publications
摘要：The authors have developed and validated a photosynthetic-sterility model for grain production monitoring under the background of climate change and Asian economic growth in developing countries. This paper presents an application of the model to evaluate car-bon- fixation rates in yields of paddy rice, winter wheat, and maize in Asia. The validation of the model is based on carbon partition-ing in grain plants. The carbon hydrate in grains has the same chemical formula as that of cellulose in grain vegetation. The parti-tioning of carbon in plants can validate fixation amounts of computed carbon using a satellite-based photosynthesis model. The model estimates the photosynthesis fixation of rice reasonably in Japan and China. Results were validated through examination of carbon in grains, but the model tends to underestimate results for winter wheat and maize. This study also provides daily distribu-tions of the PSN, which is the CO2 fixation in Asian areas combined with a land-cover distribution classified from MODIS data, NDVI from SPOT VEGETATION, and meteorological re-analysis data by European Centre for Medium-Range Forecasts (ECMWF). The mean CO2 and carbon fixation rates in paddy areas were 25.92 (t CO2/ha) and 5.28 (t C/ha) in Japan, respectively. Comparisons between the model's values and MODIS seasonal PSNs show similar trends. The writers are preparing to compare computed photosynthesis rates with observed AsiaFlux data for the validation of this model at field sites of paddy, grassland and for-ests in Japan and Asian countries. The model is based on routine meteorological and remotely sensed data, enabling operational monitoring of crop yields
