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首页> 外文期刊>Zeitschrift fur Bewasserungswirtschaft >Irrigation scheduling measurements and predictions in Shaanxi, North-West China
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Irrigation scheduling measurements and predictions in Shaanxi, North-West China

机译：中国西北地区的灌溉计划测量与预报

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Scheduling calculations and the interpretation of relative soil water changes measured by a small number of capacitance probes provided consistent guidance for managing deficit irrigation practice in N W China. Hence earlier reservations over use of capacitance probes do not appear valid in these circumstances. Only sufficient irrigation water should be supplied to achieve maximum water use efficiency/productivity for wheat and for regulated deficit irrigation of orchard crops. So, data regarding typical use was collected for a back-filled lysimeter and for a field site, using three Environscan and seven Diviner installations. Then mean data was compared with scheduling model predictions for wheat and maize. Water supply for wheat was sufficient torealize maximum water use efficiency, with minimal root water uptake helow 0.4 m depth and soil water sensors provided data for improved irrigation scheduling. Significant root water uptake by peach trees was also only appaient for a CM m soil depth Means of soil water change, for six Diviner tube and four Theta Probe measurements, were comparable to scheduling model predictions. For a large part of the study, the fraction of soil pore space subject to wetting and drying was relatively small, being 7-8%by volume. Interpretation of relative changes of soil water data was shown to be of most value in managing irrigation scheduling. These relative soil water changes were quite similar, for soil water sensors having a wide range of volume being sensed byeach instrument.
机译：通过少量电容式探头测得的日程安排计算和相对土壤水分变化的解释，为中国西北地区的亏水灌溉实践提供了一致的指导。因此，在这些情况下，较早使用电容式探针的保留似乎无效。仅应提供足够的灌溉水，以实现小麦和果园作物缺水灌溉的最大用水效率/生产力。因此，使用三个Environscan和七个Diviner装置收集了回填测渗仪和现场的典型用途的数据。然后将平均数据与小麦和玉米的调度模型预测进行比较。小麦的供水足以实现最大的水分利用效率，最低的根系吸水深度仅为0.4 m，土壤水分传感器为改善灌溉计划提供了数据。桃树对根的大量吸水也仅适用于土壤深度为CM m的情况。对于六个Diviner管和四个Theta Probe测量，土壤水分变化的平均值可与计划模型的预测相媲美。在大部分研究中，湿润和干燥的土壤孔隙空间比例相对较小，为7-8％（按体积计）。在管理灌溉计划中，解释土壤水数据的相对变化是最有价值的。这些土壤水分的相对变化非常相似，因为每种仪器都可以检测到具有大范围体积的土壤水分传感器。

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