郑州市土壤相对湿度变化特征及影响因素分析  

Analysis of Relative Soil Moisture Variation Characteristics and Influencing Factors in Zhengzhou City

作　　者：王富强[1] 王雷[1] 陈希[1] 

机构地区：[1]华北水利水电大学水利学院,郑州450045

出　　处：《节水灌溉》2015年第2期8-11,共4页Water Saving Irrigation

基　　金：国家自然科学基金项目(51379078);广东省水利科技创新项目(2011-22)

摘　　要：土壤相对湿度是表征农业旱情的重要指标之一,系统分析土壤相对湿度变化特征有助于准确预报农业干旱状况。利用1994-2013年郑州市逐旬土壤相对湿度和逐月降水、气温数据,应用统计学方法分析了郑州市土壤相对湿度变化特征,初步探明了土壤相对湿度变化与降水和气温的关系。研究结果显示,郑州市近20年土壤相对湿度呈逐年减小趋势,减小速率为每年0.44%;10、20、50cm土层土壤相对湿度最大的年份分别为2006、1996、1996年,最小的年份分别为2010、2008、1995年,土壤相对湿度呈逐年减小趋势,减小速率分别为每年0.29%、0.48%、0.13%;土壤相对湿度与降水呈正相关、与气温呈负相关,且与降水的相关性更强;随着土壤层次的增加,土壤相对湿度与降水的相关性先增强后减弱,与气温的相关性则逐渐减弱;0-20cm土层土壤相对湿度较其他层次与降水和气温的关系最密切,研究结果可为区域农业抗旱减灾工作提供参考。The relative soil moisture is an important index to characterize agriculture drought.The systematic analysis of relative soil moisture variation characteristics helps to accurately forecast agriculture drought conditions.In this paper,the statistical methods are applied to analyze the relative soil moisture variation characteristics and the relationship between relative soil moisture and precipitation and temperature is preliminarily explored by using relative soil moisture,the monthly precipitation and temperature data from1994 to 2013in Zhengzhou.The results show that the relative soil moisture of past nearly 20 years is gradually decreasing,the reducing rate is 0.44% per year;the largest value of relative soil moisture in 10,20,50 cm soil layer occurred,respectively,in the year of 2006,1996 and 1996,while the smallest value occurred,respectively,in the year of 2010,2008 and 1995,the relative soil moisture is gradually decreasing,and the reducing rates are 0.29% per year,0.48% per year,0.13% per year,respectively;the relative soil moisture is positively correlated with precipitation and negatively correlated with temperature,and shows stronger correlation with precipitation;with the increase of soil levels,the correlation between relative soil moisture and precipitation increases first and then decreases,while the correlation between relative soil moisture and temperature decreases gradually;the relationship between relative soil moisture and precipitation and temperature in 0-20cm soil layer is the most closely.This research will provide a reference for regional agricultural drought resistance work.

关 键 词：土壤相对湿度 降水 气温 相关性分析 郑州市 

分 类 号：TV213.9[水利工程—水文学及水资源]