关键词: 冬灌田, CH₄, N₂O, 排放速率

Abstract: By using the 1975-2004 day-by-day observation data from 81 meteorological stations in Heilongjiang Province and the corresponding interpolated grids data, and based on WOFOST model, the climatic productivity of Beta vulgaris was simulated. The spatial characteristics of this productivity and the climatic affecting factors were analyzed. The results showed that the climatic productivity of early and mid mature varieties of B. vulgaris was increased from north to south in the central and east parts and decreased from north to south in the west part of the Province, while the climatic productivity of late mature variety was increased from north to south in the central-east and east parts, decreased from north to south in the west part, and was at middle level in the central-west part of the Province. The spatial distribution of the chief climatic factors had important effects on the climatic productivity of B.vulgaris. Taking the climatic productivity anomaly percent, variation coefficient of actual yield, and four climatic factors (average air temperature at branch and leaf exuberating phase, average air temperature at sugar accumulating phase, rainfall at root expanding phase, and daily air temperature difference between maximum and minimum at sugar accumulating phase) in the major growth phases closely related with climatic productivity as the parameters, and using dynamic clustering analysis, the possible planting areas of early, mid, and late mature varieties of B. vulgaris in Heilongjiang Province were zoned into 8, 7, and 6 planting climatic areas, respectively.

Key words: Winter-time flooded paddy field, CH₄ and N₂O, Emission rate