Tempo-spatial Characteristics and Impact Factors of Radiation Use Efficiency of Wheat-maize Rotation System in Henan Province

doi:10.3969/j.issn.1000-6362.2016.03.007

Abstract

Abstract:

The tempo-spatial characteristics in radiation use efficiency (RUE) of wheat, maize and wheat-maize rotation system were analyzed based on crop production energy, total solar radiation during crop growing season and annual global radiation from the observed meteorological and crop data during 1981 to 2007 at 19 stations in Henan province. Subsequently, the contribution rates of the changes in global radiation and crop production energy to the change in RUE were calculated with the statistical regression method. The study further calculated the contribution rates of the changes in crop production energy of wheat and maize to the change in production energy of wheat-maize rotation system. The study results showed that RUE of wheat-maize rotation system varied from 0.75% to 1.61% in Henan province. The high value areas occurred at Tangyin in the northern Henan province and Lushi in the western Henan province, while the low value areas were in the northwestern, eastern and southern Henan province. Average RUE of wheat was 0.65%-1.63% with the highest values at Tangyin and Lushi, and following by most sites of the eastern Henan province, while the low value area in the northwestern and eastern Henan province. Average RUE of maize was 0.85%-1.81%, with the high value area at most of the sites in the northern and western Henan province except for the lowest value at Sanmenxia, while the low value area in the northwestern, eastern and the southern Henan province. RUE of wheat-maize rotation system at Ruzhou, Xiping, Xinxiang and Zhumadian showed a significant rising trend due to the decrease in annual global radiation and the increase in production energy of wheat-maize rotation system. The contribution rates of the decrease in annual total global radiation and the increase in production energy of wheat-maize rotation system to the increase in RUE were 4%-31% and 69%-96% respectively from 1981 to 2007. However, the increase in annual global radiation had a negative contribution rate on RUE of wheat-maize rotation system at Lushi. The contribution rates of the change in wheat production energy to the change in the production energy of rotation system were 65% and 90%, which were higher than those of maize with the values of 35% and 10% at Lushi and Ruzhou. However, contrasting results occurred at Xiping, Xinxiang and Zhumadian with higher contribution rates of 51%, 72% and 65% for maize than the contribution rates of 49%, 28% and 35% for wheat. In the future, improving crop production energy is still an effective method to increase radiation use efficiency and different areas should focus on diffident crops in Henan province.

Key words: Crop growing season, Global radiation, Crop production energy, Contribution rate, Resource use efficiency

CHANG Qing, WANG Jing, YU Wei-dong, WANG Na, TAN Mei-xiu. Tempo-spatial Characteristics and Impact Factors of Radiation Use Efficiency of Wheat-maize Rotation System in Henan Province[J]. Chinese Journal of Agrometeorology, 2016, 37(03): 316-325.

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