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Evaluating Responses of Crop Water Use, Soil Water Storage and Infiltration to Precipitation Using Insentek Probes

Anzhen Qin1Dongfeng Ning1ZhANDong Liu1Bin Sun2Ben Zhao1Junfu Xiao1Zugui Liu1

1. Key Laboratory of Crop Water Use and Regulation, Ministry of Agriculture, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences2. Xuchang Irrigation Experiment Station,Xuchang Water Authority

摘要:Precipitation has been shown to increase soil water storage(SWS) and soil infiltration depth(SID) while significantly restrain crop water use(i.e., crop evapotraspiration, ETc) during rainy days. However, the reducing effects on ETc and increasing effects on SWS and SID has not been well quantified due to a lack of automatic soil moisture measurement. Insentek probe is a newly developed soil moisture monitoring equipment that achieves automatic measurement of soil moisture. This enables the calculation of SWS and SID related to precipitation. Four Insentek probes were installed in four corresponding lysimeters to monitor SWS, SID and ETc for maize plants during rainy days at Xuchang Irrigation Experiment Station, in 2015 and 2016. Both lysimeter and Insentek ETc was related to precipitation in a power function. The reducing effect of precipitation on Insentek ETc was greater compared with lysimeter ETc. The relationships between SWS increment and precipitation, and between SID and precipitation were fitted to a positively linear function. The linearity indicated that per 10 mm precipitation averagely increased SID by 17.9 cm and SWS by 7.3 mm, respectively. We conclude that precipitation is an independent factor that determines ETc of maize on rainy days despite of current soil moisture status in semi–humid climate in the North China Plain.
会议名称:

2018 International Conference on Mathematics, Modelling, Simulation and Algorithms(MMSA2018)

会议时间:

2018-03-25

会议地点:

中国四川成都

  • 专辑:

    农业科技

  • 专题:

    农业基础科学; 农艺学

  • 分类号:

    S152.7

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