基于K-means聚类算法的草莓灌溉策略研究  

Investigation of Strawberry Irrigation Strategy Based on K-means Clustering Algorithm

作　　者：李莉[1] 王宏康 吴勇 陈士旺 王海华[1] SIGRIMIS N A Algorithm LI Li;WANG Hongkang;WU Yong;CHEN Shiwang;WANG Haihua;SIGRIMIS N A(Modern Precision Agriculture System Integration Research Key Laboratory,Ministry of Education,China Agricultural University,Beijing 100083,China;Key Laboratory of Agricultural Information Acquisition Technology,Ministry of Agriculture and Rural Affairs,China Agricultural University,Beijing 100083,China;Department of Agricultural Engineering,Agricultural University of Athens,Athens 11855,Greece)

机构地区：[1]中国农业大学现代精细农业系统集成研究教育部重点实验室,北京100083 [2]中国农业大学农业农村部农业信息获取技术重点实验室,北京100083 [3]雅典农业大学农业工程系,雅典11855

出　　处：《农业机械学报》2020年第1期295-302,共8页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家重点研发计划项目(2016YFD0201003-4);丽江市科技计划项目:汪懋华院士工作站

摘　　要：为进一步提高日光温室封闭式栽培下草莓灌溉水肥利用率,研究了基质含水率和温度影响下的草莓灌溉策略优化方法。采用土壤水分传感器对草莓果期基质含水率进行实时监测,通过对基质含水率随时间变化的规律分析,并结合日平均温度进行K-means聚类分析,提出一种草莓优化灌溉策略。试验结果表明,灌溉第1阶段基质含水率快速上升,在灌溉结束时达到峰值,每次灌溉基质含水率平均提高21.5个百分点;第2阶段快速下降,在20 min内基质含水率平均下降3.5个百分点;第3阶段变化趋于平稳,在30 min内基质含水率平均下降1.2个百分点。在每个灌溉周期内,含水率呈线性下降趋势,在整个果期内,其斜率随日平均温度的升高逐渐增加,由0.0114增加至0.0365。研究结果表明,根据基质含水率变化和日平均温度区间进行定量灌溉,理论上果期每株草莓仅需要4.51 L水,可节水15.4%,该方法能有效提高水肥利用率,实现节水节肥。Substrate cultivation is the development direction of greenhouse cultivation mode,and it is of great significance to study the modern precision irrigation method for substrate cultivation.On-demand irrigation is one of the main methods of modern precision irrigation.It is inseparable from real-time monitoring and feedback of water content.The water content is an important parameter in modern precision irrigation methods.Moisture sensor based on the principle of frequency domain reflection(FDR)was used in a substrate environment for monitoring water content.The moisture detection module of JZH-0 sensor adopted the principle of FDR,which had good performance on the soil moisture testing.However,it needed to be calibrated before using in different kinds of substrate.In order to further optimize the closed cultivation irrigation method in solar greenhouse and improve the water and fertilizer utilization rate,based on the theoretical research of on-demand irrigation,the existing integrated irrigation system of water and fertilizer,air temperature sensor and soil moisture sensor were mainly used for irrigation and real-time data monitoring and collection.The study on the irrigation strategy of closed greenhouse cultivation of strawberry in greenhouse was carried out by collecting the moisture content of the substrate under the experience of irrigation and the temperature in the greenhouse.The variation of moisture content of substrate in different time scales was firstly summarized.The result showed that the substrate water content of each irrigation rose rapidly,reaching a peak at the end of each irrigation time,with an average increase of about 21.5 percentage points;the second stage decreased rapidly,with an average decrease of 3.5 percentage points in 20 min;the third stage of the trendwas stabilized,with an average decrease of 1.2 percentage points in 30 min.During each irrigation cycle,the water content of the substrate showed a linear downward trend,and the slope of the substrate could better reflect the daily v

关 键 词：草莓 灌溉策略 K-MEANS聚类算法 基质含水率 日平均温度 水肥一体化 

分 类 号：S274[农业科学—农业水土工程]