The yield potential of crops is closely related to variety and climate. Since 1950s there have been 4-5 variety renovations of winter wheat in China’s major wheat-growing areas, with significant climate change occurring in the same period. The confounding effects of climate and
variety factors have not been separately investigated. This paper, taking Shijiazhuang as an example, estimated yield potential of five widely-used winter wheat varieties from 1955 to 2008 using the model DSSAT4.0 and the trends in accumulated temperature, solar radiation, and precipitation
at four growth stages were analyzed to investigate the effects of climate change and variety improvement on wheat yield potential. The results showed that climate change was not uniform at different growth stages and had different impacts on wheat yield potential. Except sowing-reviving period,
increasing trend of the accumulated temperature above 0 and decreasing trend of the solar radiation had significant negative effect on photothermal yield potential. Accumulated temperature during jointing-heading stage increased significantly, showing great influence on photothermal yield
potential of the varieties bred before 1990s. And Solar radiation heading-maturity period decreased significantly, showing great influence on photothermal yield potential of the varieties bred after 1990s. Rainfed yield of all varieties was lower than photothermal yield potential and significantly
affected by precipitation from reviving to maturity, indicating that water was the limiting factor in the region. Increasing of precipitation during reviving-jointing stage had significant positive effect on rainfed yield.
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Keywords:
DSSAT model;
climate change;
simulation;
wheat variety;
yield potential
Document Type: Research Article
Publication date:
15 December 2011
More about this publication?
Transations of the Chinese Society of Agricultural Engineering(TCSAE), founded in 1985, is sponsored by the Chinese Chemical Society. TCSAE has been indexed by EI Compendex, CAB Inti, CSA. TCSAE is devoted to reporting the academic developments of Agricultural Engineering mainly in China and some developments from abroad. The primary topics that we consider are the following: comprehensive research, agricultural equipment and mechanization, soil and water engineering, agricultural information and electrical technologies, agricultural bioenvironmental and energy engineering, land consolidation and rehabilitation engineering, agricultural produce processing engineering.
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