土默特右旗ET0对气象因子和相关参数的响应

Response of ET_0 to Meteorological Factors and Related Parameters in Tumote Youqi

【目的】研究ET0与气象因子和相关参数的响应性。【方法】以内蒙古包头市土默特右旗为研究区,采用ENVI5.3软件,遥感反演相关参数,分析了参考作物腾发量(ET0)与气象因素和相关参数的相关性和主成分。【结果】(1)在年尺度上,气象因素对ET0的相关性排序为:净辐射>日照时间>最高温度>相对湿度>最低温度>风速。在月尺度上,ET0在7月对最高温度和日照时间最敏感;4月ET0对相对湿度最敏感;5月对风速最敏感;净辐射与ET0相关性在4—10月都很显著;ET0与最低温度相关性不显著。在作物生长季,ET0主要受净辐射、日照时间、最高温度的影响。(2)3种相关参数NDVI、植被覆盖度、地表温度和ET0均显著正相关,NDVI的相关性最显著。(3)利用主成分分析得到主成分变量Z1、Z2代替了原始数据(最高温度、最低温度、相对湿度、日照时间、风速、NDVI、植被覆盖度、地表温度、净辐射),使复杂的研究变得简单。【结论】在作物生长季,ET0主要受净辐射、日照时间、最高温度的影响;在相关参数中,与NDVI的相关性最好。

[Objective] Study the response of ETo and meteorological factors to the related parameters. [Method] The correlation and principal components between reference evapotranspiration （ET0） and meteorological factors and related parameters were analyzed by using ENVI5.3 software in the Tumote Youqi, Baotou City, Inner Mongolia. [Result] （1）At the annual scale, the correlation of meteorological factors for ETo was： net radiation〉sunshine time〉maximum temperature〉relative humidity〉minimum temperature〉wind speed. On the month scale, ETo was most sensitive to maximum temperature and sunshine time in July; In April ETo was most sensitive to relative humidity; May was most sensitive to wind speed; net radiation and ET0 correlation was significant every month; ET0 has no significant correlation with minimum temperature. During the crop season, ETo is mainly affected by net radiation, sunshine time, and maximum temperature. （2）The correlation between NDVI, vegetation coverage, surface temperature and ETo were significant, and all of them were positively correlated, NDVI was the most significant. （3）Using the principal component analysis, the principal component variables Z1 and Z2 are substituted for the original data（maximum temperature, minimum temperature, relative temperature, sunshine time, wind speed, NDVI, vegetation coverage, surface temperature, season, ETo is mainly affected by net radiation, sunshine time the correlation with NDVI is the best. net radiation）. [Conclusion] During the growing and maximum temperature. In related parameters,