Proceedings Paper
Numerical simulation of variance of solar radiation and its influence on wheat growth| Format | Member Price | Non-Member Price |
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Paper Abstract
The growth of crops is directly related to solar radiation whose variances influence the
photosynthesis of crops and the growth momentum thereof. This dissertation has Zhengzhou, which
located in the Huanghuai Farmland Ecological System of China, as an example to analyze the rules of
variances of total solar radiation, direct radiation and diffusive radiation. With the help of linear trend
fitting, it is identified that total radiation (TR) drops as a whole at a rate of 1.6482J/m2. Such drop has
been particularly apparent in recent years with a period of 7 to 16 years; diffusive radiation (DF) tends
to increase at a rate of 15.149 J/m2 with a period of 20 years; direct radiation (DR) tends to drop at a
rate of 15.843 J/m2 without apparent period. The total radiation has been on the decrease ever since
1980 during the growth period of wheat. Having modified relevant Parameter in the Carbon and
Nitrogen Biogeochemistry in Agroecosystems Model (DNDC) model and simulated the influence of
solar radiation variances on the development phase, leaf area index (LAI), grain weight, etc during the
growth period of wheat, it is found that solar radiation is in positive proportion to LAI and grain weight
(GRNWT) but not apparently related to development phase (DP). The change of total radiation delays
the maximization of wheat LAI, reduces wheat LAI before winter but has no apparent effect in winter
and decreases wheat LAI from jointing period to filling period; it has no apparent influence on grain
formation at the early stage of grain formation, slows down the weight increase of grains during the
filling period and accelerates the weight increase of grains at the end of filling period. Variance of
radiations does not affect the DP of wheat much.
Paper Details
Date Published: 9 October 2007
PDF: 12 pages
Proc. SPIE 6679, Remote Sensing and Modeling of Ecosystems for Sustainability IV, 66790L (9 October 2007); doi: 10.1117/12.729274
Published in SPIE Proceedings Vol. 6679:
Remote Sensing and Modeling of Ecosystems for Sustainability IV
Wei Gao; Susan L. Ustin, Editor(s)
PDF: 12 pages
Proc. SPIE 6679, Remote Sensing and Modeling of Ecosystems for Sustainability IV, 66790L (9 October 2007); doi: 10.1117/12.729274
Show Author Affiliations
Xuefen Zhang, Atmospheric Observation Technical Ctr. of CMA (China)
Nanjing Univ. of Information Science and Technology (China)
Chunyi Wang, Chinese Academy of Meteorological Science (China)
Nanjing Univ. of Information Science and Technology (China)
Chunyi Wang, Chinese Academy of Meteorological Science (China)
Zixuan Du, Henan Institute of Meteorological Science (China)
Wei Zhai, Chinese Academy of Meteorological Science (China)
Wei Zhai, Chinese Academy of Meteorological Science (China)
Published in SPIE Proceedings Vol. 6679:
Remote Sensing and Modeling of Ecosystems for Sustainability IV
Wei Gao; Susan L. Ustin, Editor(s)
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