渗入土壤并储存在作物主要根系吸水层中的降雨量。其数量为降雨量扣除地面径流量和深层渗漏量。和根系吸水层的深度、土壤持水能力、雨前土壤储水量、降雨强度和降雨量等因素有关,要通过根系吸水层的水量平衡计算确定。
【Key words】 slope; limit equilibrium method; the finite element method; clinometer; displacement; water level; efficiency rainfall; grey system; grey association;
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以实际蒸发蒸腾量、有效降雨量和土壤贮水量来预报未来灌水时间。
It is based on actual evapotranspiration capacity, effective rainfall and water reserve of soil to forecast irrigation time.
这个有效的样例应用程序可以用来比较两个城市的天气数据,具体方法是在Lotus Symphony电子表格图表中以图形的方式显示平均降雨量数据。
This nontrivial sample application can be used to compare climate data for two cities through the visualization of their average rainfall data as graphs in a Lotus Symphony spreadsheet chart.
并在此基础上,以光合有效辐射、温度和降雨量作为气候指标,分析了它们与牧草长势之间的关系。
On this basis, this paper takes effective photosynthesis radiation, temperature and rainfall as climatic indexes, and analyzes their relations with pasture growth.
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