| 引用本文: | 张曼雪,罗厚攀,陈川,等.西南季节性干旱区农田土壤水分对降雨的动态响应[J].灌溉排水学报,0,():-. |
| ZHANG Manxue,LUO Houpan,CHEN Chuan,et al.西南季节性干旱区农田土壤水分对降雨的动态响应[J].灌溉排水学报,0,():-. |
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| 摘要: |
| 【目的】探明西南季节性干旱区不同作物下农田土壤含水率对不同降雨事件的动态响应。【方法】基于田间原位观测，结合2023年4—10月降水和土壤含水率原位连续监测数据，对比分析水稻田和玉米地土壤含水率对不同强度降雨的响应规律。【结果】①不同强度降雨对农田土壤水分补给深度不同，小降雨事件（降雨强度<2 mm/h）对土壤补给深度为0~20 cm，强降雨事件（降雨强度>8 mm/h）对土壤补给深度为0~50 cm；②不同作物下农田土壤水分对降雨事件的响应存在显著差异，研究期间水稻田和玉米地的土壤水分补给速率均值分别为0.72、1.07 %/h，有效补给滞后时间均值分别为0.88、5.38 h，消退速率均值分别为0.04、0.02 %/h；③与玉米地相比，稻田对降雨响应更敏感且响应效应更强烈，这可能与作物的冠状叶片截留、根系保水能力有关，同时土壤初始含水率影响土壤水分对降雨事件的响应效应。【结论】强降雨事件能够有效补给农田土壤水分，雨强较小或无降雨时，应根据土壤墒情及时补充地面灌溉。 |
| 关键词: 土壤水分;降雨;西南季节性干旱区;农田;作物 |
| DOI： |
| 分类号:S715.3 |
| 基金项目:国家现代农业产业技术体系专项（CARS-02-18） |
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| Dynamic response of farmland soil moisture to rainfall in seasonal drought regions in Southwest China |
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ZHANG Manxue1, LUO Houpan1, CHEN Chuan1, YU Kangning1, CHEN Taiyang1, HUANG Rong1, LIU Zhandong2
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1.Sichuan Dujiangyan Water Conservancy Development Center;2.Farmland Irrigation Research Institute of CAAS and MWR
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| Abstract: |
| 【Objective】In order to investigate the dynamic response of farmland soil moisture under different crops to different rainfall events in the seasonal drought regions in Southwest China,【Method】The paper based on in-situ observation in the field and combined with the monitoring data of rainfall and soil moisture content from April to October 2023 to compared and analyzed the response of soil moisture content in paddy field and corn field to different rainfall intensities.【Result】The results showed that: (1) Different rainfall intensities have different soil water recharge depths. Light rainfall events (rainfall intensity <2 mm/h) affect the soil recharge layer from 0 to 20 cm. Heavy rainfall events (rainfall intensity<8 mm/h) affect the soil recharge layer from 0 to 50 cm; (2) The responses of soil water to rainfall events under different crops have significant differences. During the monitoring period, the mean values of effective recharge efficiency of the corn field and paddy field were 0.72%/h and 1.07%/h, the mean values of effective recharge lag time were 0.88 h and 5.38 h, and mean values of regression rates were 0.04%/h and 0.02%/h, respectively; (3) Compared with corn fields, paddy fields are more sensitive to rainfall and have a stronger response effect, which may be related to the interception of crown leaves and the water retention ability of the roots of crops. Meanwhile, the initial soil water content affects the response of soil water to rainfall events. 【Conclusion】Heavy rainfall events can effectively recharge farmland soil water. During light rainfall events or dry periods, soil moisture content should be timely supplemented by ground irrigation. |
| Key words: Soil moisture; Rainfall; Southwest Seasonal drought regions; Farmland; Crop |
