摘要
利用科尔沁沙地西部乌兰敖都地区1981-2004年气象资料,分析气温和降水关系.结果表明,气温呈上升趋势,降水量呈相反趋势.各季节气温升高的月份正是降水量减少的月份,同时,降水量增加的月份正是气温降低的月份.春、冬季气温有逐渐回升的趋势.年降水量波动较大,5～9月降水（279.2 mm）占全年降水量的87.7%,同期平均降水日数（52.3 d）占年降水日数的70.3%.约有80%的最长干旱持续期出现在冬春两季.夏季和全年的降水量与其平均气温呈显著负相关 （P〈0.05）,秋、春、冬季降水量与气温相关性依次逐渐减小.24 a来降水量总体下降的趋势可能与1999-2004年年降水量低于多年平均降水量有关.
The Ulanaodu region （43°02＇N, 119°39＇E） is located in the western part of the Horqln Sandland, the annual precipitation is 318.4 mm, in which the precipitation proportions in summer, spring, autumn and winter are 69.6%, 13.7%, 13.5 % and 3.2% respectively; the annual days of occurring precipitation are 74.2 days, in which the days of occurring precipitation for 0.0 mm are 16.9 days; and the aridity index and relative humidity vary in ranges of 1.0-1.8 and 50%-55% respectively. In this paper, the relationship between temperature and precipitation in the Ulanaodu region of Horqin Sandland is analyzed by using the meteorological data observed in 24 years from 1981 to 2004. The results are as follows： （1） The temperature in the Ulanaodu region of Horqin Sandland was increased, the annual temperature was increased from 6.8 ℃ in 1985 to 7.5 ℃ in 2004, whereas the precipitation was decreased; （2） The precipitation was decreased when the temperature trended to increa, and the temperature was decreased when the precipitation trended to increase; （3） The temperature in spring and winter trended to increase gradually; （4） Precipitation occurred mainly during the period from May to September, the amount and occurring days of precipitation during this period were 279.2 mm and 52.3 days and occupied 87.7% and 70.3% of annual ones, respectively; （5） About 80% of droughts occurred in winter and spring; （6） Precipitation was negatively related to average temperature in summer and all year round （P〈 0.05）, and the correlation between precipitation and temperature in autumn, spring and winter was gradually decreased in an ordinal way; （7） Precipitation in the 24 years was generally decreased, especially during the period of 1999- 2004.
出处
《干旱区研究》
CSCD
北大核心
2006年第1期104-108,共5页
Arid Zone Research
基金
科尔沁沙地典型地区荒漠化动态监测研究(00-08-05)
科尔沁沙地西部退化土地持续经营示范研究(20010103)
关键词
降水
气温
气候变化
科尔沁西部
乌兰敖都
precipitation
temperature
climate change
Horqin sandland
Ulanaodu region.
