淮北平原冬小麦土壤相对湿度变化特征及其影响因素分析

Analysis of Winter Wheat Soil Relative Humidity Characteristics and Influencing Factors in Huai⁃bei Plain

为了给淮北平原冬小麦抗旱和节水灌溉工作提供参考依据,选取1992—2013年淮北平原冬小麦土壤相对湿度旬值和逐月降水、气温数据,分析土壤相对湿度的年际变化特征,采用相关分析方法探讨不同土层土壤相对湿度与降水和气温的相关关系,并建立不同土层土壤相对湿度与降水和气温的回归方程。结果表明:淮北平原冬小麦平均土壤相对湿度以每年0.19%的速度下降,10、20、50cm土层下降速度分别为每年0.08%、0.11%、0.31%。淮北平原冬小麦土壤相对湿度与降水呈正相关,10cm土层土壤相对湿度与降水相关性最强;与气温呈负相关,20cm土层土壤相对湿度与气温相关性最强;20cm土层土壤相对湿度与降水和气温的相关性最强。

The ten-day value of soil relative humidity,monthly precipitation and air temperature data of winter wheat in Huaibei Plain from 1992 to 2013 were selected,the interannual variation characteristics of soil relative hu⁃midity were analyzed,the correlation between soil relative humidity and precipitation and air temperature in different soil layers were discussed by using correlation analysis method,and the regression equations between soil relative hu⁃midity and precipitation and air temperature in different soil layers were established.The results showed that the av⁃erage soil relative humidity of winter wheat in Huaibei Plain decreased at an annual rate of 0.19%,and the decreas⁃ing rates of 10cm,20cm and 50cm were 0.08%,0.11%and 0.31%respectively.There is a positive correlation be⁃tween the relative humidity of winter wheat and precipitation in Huaibei Plain.The relative humidity of 10cm soil lay⁃er has the strongest correlation with precipitation and negative correlation with air temperature,and the relative hu⁃midity of 20cm soil layer has the strongest correlation with air temperature.The correlation between soil relative hu⁃midity and precipitation and air temperature is the strongest in 20cm soil layer,which can provide reference for wa⁃ter-saving irrigation and drought relief of winter wheat in Huaibei Plain.