[目的]分析1960 ～2009年贵港地区气温日较差的演变趋势.[方法]利用贵港地区1960 ～2009年来具有连续完整记录的3个气象台站的平均气温、日最高和最低气温等资料,对该地区气温日较差变化特征进行了分析,研究该地区气温日较差的演变趋势.[结果]年最低气温、最高气温均呈明显上升趋势,最高气温上升幅度小于最低气温,气温日较差呈减小趋势；夏秋季气温日较差大于冬春季,各月变化呈单峰单谷型；气温日较差空间变化倾向值形成以北回归线为中心向两侧逐渐减小趋势；远离北回归线的台站极端日较差减小幅度最大,显著性强；靠近北回归线的台站极端日较差减小幅度较小,甚至呈弱增加趋势,但显著性水平不高.不同因子对日较差影响不同,日照与日较差正相关显著,总云量、相对湿度和降水量与日较差负相关显著,而与平均风速相关性不显著.[结论]该研究为了解贵港地区气候变化规律提供依据.%[ Objective] The aim was to analyze diurnal temperature range in Guigang from 1960 to 2009. [ Method] Based on the conventionalrnmeteorological data (mean daily temperature, mean max irnum temperature, and mean minimum temperature) of Guigang region during 1960 -rn2009,the Diurnal Temperature Range (DTR) and the DTR trend were studied. [Result] The annual minimum temperatures and the annualrnmaximum temperature were significantly increasing. The maximum temperature rose less than minimum temperature and spatial changes of dailyrntemperature narrowed gradually from the Tropic of Cancer to the two aides. The extreme diurnal temperature decreased mostly in stations far a-rnway from the Tropic of Cancer and the significance was strong. The extreme diurnal temperature decreased little in stations close to the Tropicrnof Cancer. Influences of different factors on daily difference varied. DTR positively correlated with sunshine duration,and negatively related torntotal cloudiness,relative humidity and precipitation. DTR had insignificant relation with average wind speed. [Conclusion] The study providedrnbasis for ihe understanding of climate changes in Guigang.
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