| 赵娜娜,刘 钰,蔡甲冰.夏玉米作物系数计算与耗水量研究[J].水利学报,2010,41(8): |
| 夏玉米作物系数计算与耗水量研究 |
| Method and realization of seismic motion input of viscous-spring boundary |
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| DOI： |
| 中文关键词: ISAREG模型 作物系数 基础作物系数 土面蒸发量 |
| 英文关键词: ISAREG model crop coefficient basal crop coefficient evaporation |
| 基金项目: |
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| 中文摘要: |
| 根据北京大兴区试验基地2007—2008年夏玉米实测资料，采用基于土壤水量平衡的ISAREG模型模拟夏玉米生育期土壤含水量的变化过程，以此反推夏玉米作物系数Kc。利用2007年茎流计实测的蒸腾量T求得夏玉米生育中、后期的基础作物系数Kcb分别为0.98和0.28，以此估算2008年夏玉米中、后期的蒸腾量和土面蒸发量，并用2008年实测的土面蒸发量进行对比验证。同时，模拟和计算了2007—2008年夏玉米生育期棵间蒸发及实际蒸散发变化过程。结果表明，估算的中期基础作物系数与实测值吻合良好，而后期基础作物系数值偏小；夏玉米棵间蒸发量占作物实际蒸散发的比例在39.0%～43.6%左右。 |
| 英文摘要: |
| Crop coefficient can reflect the effects of crop biological characteristics, yield level, the condition of soil water fertilizer and the effect of management level on crop water requirement, which is the basis of calculating crop water requirement. In this paper the ISAREG model which is on the basis of soil water balance is adopted to simulate the variation process of soil water content of summer maize in the whole growth period, and the crop coefficient is back calculated according to the observed data of summer maize in Beijing Daxing Experiment Station of IWHR in the year of 2007 and 2008 . According to the observed transpiration data of sap flow, the basal crop coefficient is 0.98 and 0.28 respectively in the middle and end of growth season With the calculated basal crop coefficient values, the transpiration and evaporation can be estimated. The validity of the estimation is verified by observed data. Then the change process of evaporation and actual crop evapotranspiration of summer maize in the year of 2007 and 2008 were simulated and estimated. Results showed that the estimated mid-season crop coefficient accords well with the observed data, but the crop coefficient at the end of growth season is underestimated. The ratio of evaporation to actual crop evapotranspiration of summer maize is about 39%~43.6%. |
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