| 不同耗水强度下节水灌溉稻田土壤含水率与非饱和土层厚度关系研究 |
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| 引用本文： | 陈苏燕,卫琦,徐俊增,栾雅珺.不同耗水强度下节水灌溉稻田土壤含水率与非饱和土层厚度关系研究[J].中国农学通报,2018,34(11):147-151. |
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| 作者姓名： | 陈苏燕 卫琦 徐俊增 栾雅珺 |
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| 作者单位： | 河海大学水利水电学院,河海大学水利水电学院,河海大学水利水电学院,河海大学水利水电学院 |
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| 基金项目： | 国家十三五重点研发项目子课题“基于田间地下水调控的水稻节水灌溉技术研究”( No.2016YFC0400103-3)；江苏水利科技项目“水稻灌区高效水肥管理模式研究与示范”(No.2016068)；江苏省高校优势学科建设工程资助项目。 |
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| 摘 要： | 为了探索基于土壤非饱和层厚度指导水稻节水灌溉的可能性,研究节水灌溉稻田土壤含水率与非饱和土层厚度的关系非常必要。本文通过设计盆栽试验,针对不同耗水强度开展连续观测,根据实时观测的土壤含水率与非饱和土层厚度,建立起两者之间的定量关系。结果表明：稻田日耗水强度越大,其非饱和土层厚度随时间增加的速率越大,达到最大值所需的时间越短。非饱和土层随时间增加时对应的土壤含水率则随时间下降,两者之间成负相关关系。通过建立土壤含水率与非饱和土层厚度的二次抛物线关系,结果显示将非饱和土层厚度作为水分控制指标指导灌溉精度高、切实可行。最后,将土壤含水率与非饱和土层厚度关系曲线运用到水稻控制灌溉的实践中,推算出土壤含水量下限对应的非饱和土层厚度值,确定以非饱和土层厚度为指标的控制灌溉方法,为黑龙江地区水稻节水灌溉管理技术提供参考,为下一步的水分运动模型率定及模拟更多土质和更多耗水情形下的土壤水分提供依据。
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| 关 键 词： | 玉米秸秆 玉米秸秆 腐熟剂 腐解速率 养分释放 |
| 收稿时间： | 2017/12/21 0:00:00 |
| 修稿时间： | 2018/2/22 0:00:00 |
Water-saving Irrigation Paddy Field: The Relationship Between Soil Moisture Content and the Thickness of Unsaturated Soil Layer Under Different Water Consumption Intensities |
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| Abstract: | To explore the possibility of guiding water-saving irrigation technique in paddy field based on the thickness of unsaturated soil layer, it is necessary to study the relationship between soil moisture content and the thickness of unsaturated soil. In this study, a pot experiment was carried out continuously for different water consumption intensities, and the quantitative relationship between soil moisture content and unsaturated soil thickness was established based on the real- time observation data of soil moisture content and the thickness of unsaturated soil. The results showed that: the thickness of unsaturated soil layer increased quicker
as the water consumption intensity got larger and it took less time to reach the maximum. The soil moisture content decreased with time and was negatively correlated to the thickness of unsaturated soil layer. Then, a quadratic parabola relationship between soil moisture content and the thickness of unsaturated soil layer was established and showed that it was practical and feasible to use the thickness of unsaturated soil layer as the water control index to guide the irrigation. Finally, the relationship between soil moisture content and the thickness of soil unsaturated layer was applied to the practice of water-saving irrigation, and the minimum thickness of soil unsaturated layer corresponding to the minimum water content of guiding irrigation was found in different stages of rice growth under different consumption intensities in paddy field. The study could provide certain reference for water-saving management in paddy field in Heilongjiang, and a basis of the future calibration and simulation of the soil moisture content and water consumption in soil by using water movement model. |
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| Keywords: | paddy field water consumption soil moisture content thickness of unsaturated soil layer function relationship |
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