眉山市晚熟柑橘园土壤水分动态变化及对不同降雨量的响应  

Reactive dynamics of soil moisture in late-ripening citrus orchards in Meishan City and their responses to varying precipitation levels

作　　者：林佳 陈龙钰 王佳林 LIN Jia;CHEN Longyu;WANG Jialin(Danleng Meteorological Bureau,Sichuan Danleng 620200,China;Qingshen Meteorological Bureau,Sichuan Qingshen 620400,China)

机构地区：[1]四川省丹棱县气象局,四川丹棱620200 [2]四川省青神县气象局,四川青神620400

出　　处：《气象研究与应用》2024年第3期106-110,共5页Journal of Meteorological Research and Application

基　　金：眉山市指导性科技计划项目(2023KJZD108)。

摘　　要：基于2023年6—9月眉山市晚熟柑橘智慧气象数字试验基地土壤水分小时观测数据,分析0~40 cm各层土壤水分时空动态变化及其对不同量级降雨的响应,确定各层土壤水分的响应阈值,并构建降雨量与土壤水分增量的对数模型。结果表明,土壤水分随土层深度呈先增加(10~20 cm层)、后减少(20~30 cm层)、再增加(30~40cm层)的趋势。10 cm、20 cm、30~40 cm土层降雨响应的阈值分别为4 mm、12 mm、20 mm,大雨量级及以上降雨事件将明显对0~40 cm各层土壤水分响应。降雨量与0~40 cm各土层土壤含水量均呈极显著相关关系,4个观测层对数函数相关系数R2值范围处于0.436~0.585(R2>0.4)。该研究结果可为晚熟柑橘优质生长、节水灌溉提供技术支持。Based on the hourly observation data of soil moisture in the late-ripening citrus smart meteorological digital test base in Meishan City from June to September in 2023,this study analyzed the spatio-temporal dynamic changes of soil moisture in each layer of 0~40 cm and its response to different magnitudes of rainfall,determined the response threshold of soil moisture in each layer,and established a logarithmic model of rainfall and soil moisture increment.The results showed that soil moisture increased firstly with soil depth of 10~20 cm,then decreased with soil depth of 20~30 cm,and then increased with soil depth of 30~40 cm.The thresholds of rainfall response in 10 cm,20 cm,and 30~40 cm layers were 4 mm,12 mm,and 20 mm respectively,and the rainfall events of heavy rain and above would obviously respond to soil moisture in each layer of 0~40 cm.Correlation analysis showed that rainfall was highly correlated with soil moisture in each layer of 0~40 cm,and the correlation coefficients of logarithmic functions of the four observation layers ranged from 0.436 to 0.585(R2>0.4).The results of this study can provide technical support for the high-quality growth and water-saving irrigation of late-ripening citrus.

关 键 词：晚熟柑橘 土壤水分 时空变化特征 降雨 响应 

分 类 号：S152.7[农业科学—土壤学]