水稻花后低温寡照的时空分布特征及其对产量的影响
毕业论文关键词：中国；低温寡照；时空特征；水稻；产量变化
Temporal-spatial Variation of Post-anthesis Cold and Scant-light Stress on Rice and the Impact on Yield
Abstract：Growth and yield formation of rice is sensitive to the extreme low temperature and scant light weather during post-anthesis, but the studies of the temporal-spatial variation of low temperature and scant light and its effect on rice yield are less currently. This study analyzes the temporal and spatial variation of post-anthesis cold and scant light stress on rice and the impact on yield using historical meteorological data and the rice yield data. Based on the daily minimum temperature and sunshine time data between anthesis and maturity of 325 sites in main rice production area of China during 1960 to 2009, we studied the dynamics of cold and scant light stress indices such as cold and scant light stress days(CSdays), comprehensive index of cold and scant light stress(CI) to analyze the impact of low temperature and scant light on rice yield. The results show that, post-anthesis cold and scant light stress on rice shows significant regional differences in the spatial variation. The most serious areas are Northeast single rice sub-region(S-NE) and Huazhong double rice sub-region(D-HZ). The second are Middle-Lower Reaches of Yangzi River single rice sub-region(S-MLYtz) and South-western Plateau single rice sub-region(S-SW). The stress in Sichuan Basin single rice sub-region(S-SC) is light relatively. On temporal variation, except some parts of S-NE, S-MLYtz and S-SW, cold and scant light stress in most parts of rice production area shows a significant decreasing trend. However, the trend in different sub-regions is affected significantly by phenology shift. In addition, year to year change of cold and scant light stress only in D-HZ shows significant correlation with year to year change of yield. The correlation is not significant in other sub-regions. These results can make contributions to ensure the production of rice stably and improve food security strategy of our country.
Key words：Chinese; Low temperature and scant light; Temporal-spatial variation; Rice; Change of yield
目 录
摘要 1
关键词 1
Abstract 1
Key words 1
引言 1
1 材料与方法 2
1.1 研究区域概况与站点选择 2