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1 前言 在推广水稻节水灌溉技术时,其灌水下限是以根层土壤水分为指标的,因而,及时、准确地获取稻田土壤水分,就成为提高推广水稻节水灌溉技术水平的关键。 稻田土壤水和浅层地下水主要来源于降雨和灌溉,消耗于水稻蒸腾、棵间蒸发和土壤渗漏。在稻田处于无水层状态,当根层土壤水大于田间无水层状态,当根层土壤水大于田间持水量时,土壤水既向上蒸腾蒸发,又向下补给地下潜水;当根层土壤水小于田间持水量时,地下潜水则
1 INTRODUCTION In popularizing rice water-saving irrigation technology, the lower limit of irrigation is based on the root soil moisture. Therefore, timely and accurate access to paddy soil moisture is the key to improve the technology of promoting water-saving irrigation in rice. Paddy soil water and shallow groundwater mainly come from rainfall and irrigation, consumed in rice transpiration, soil evaporation and soil leakage. In the paddy field is in an anhydrous state, when the root layer of soil water is greater than the field anhydrous state, when the root layer of soil water is greater than the field capacity, the soil water both transpiration evaporate, and down to supply underground diving; when the root layer of soil water Less than the field capacity, the underground diving