| Field water surplus and deficit of major crops in dryland of northern China |
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| 作者姓名： | Received date: -- Foundation item: The national key research project: Field water balance and its regulation techniques water potential productivity and its proper exploitation in typical dryland farming areas of northern China for the Ninth Five |
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| 作者单位： | Received date: 2000-01-23 Foundation item: The national key research project: Field water balance and its regulation techniques，water potential productivity and its proper exploitation in typical dryland farming areas of northern China for the Ninth Five |
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| 基金项目： | The national key research project: Field water balance and its regulation techniques, water potential productivity and its prope |
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| 摘 要： | 1 IntroductionIn natural conditions, field water surplus or deficit is different between field water requirement and field water supply by nature. Field water requirement can be expressed either as potential field evapotranspiration or as crop water requirement. Potential field evapotranspiration is also called reference crop evapotranspiration which is defined as "the rate of evapotranspiration from an extensive surface of 8 to 15 cm tall, green grass cover of uniform height, actively growing…
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Field water surplus and deficit of major crops in dryland of northern China |
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| Received date: -- Foundation item: The national key research project: Field water balance and its regulation techniques,water potential productivity and its proper exploitation in typical dryland farming areas of northern China for the Ninth Five.Field water surplus and deficit of major crops in dryland of northern China[J].Journal of Geographical Sciences,2000(3). |
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| Authors: | Received date: -- Foundation item: The national key research project: Field water balance and its regulation techniques water potential productivity and its proper exploitation in typical dryland farming areas of northern China for the Ninth Five |
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| Abstract: | The definition and classification of field evapotranspiration was discussed, based on which the calculation model for field evapotranspiration was established. Based on crop, soil measurements and mean climatic data in 1950-1980, mean field water surplus or deficit on climatic, crop and cropland basis in dryland of northern China was calculated, and the pattern of field water surplus or deficit was analyzed and discussed in this paper. |
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| Keywords: | Northern China dryland field evapotranspiration crop water requirement crop water consumption field water surplus or deficit |
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