摘要
采用甘肃黄土高原地区有连续观测值的37个气象站,1971年～2000年最新30年10cm地温数据,统计分析其在所研究区域50个县(市、区)的时间变化规律和空间分布特征.研究表明:甘肃黄土高原地区4月和10月10cm地温总体上在10℃以上,4～10月是该区域主要作物的重要生长期.其空间分布特征不服从东南部高于西北部的一般规律.4月10cm地温在空间分布上有3个高值中心:一个中心在兰州最大值为14.3℃,另一个中心天水次大值为14.1℃,第3个中心泾川高值为12.9℃.有2个低值中心,一个在东乡,中心最小值为8.3℃;另一个中心环县次小值为9.2℃.10月10cm地温在空间分布上有2个高值中心,一个中心在靖远最大值为12.3℃,另一中心天水的北道次大值为13.1℃.1个低值中心在东乡,最小值为8.1℃.其他站则随其地理位置和海拔不同而在此范围内交替变化.从时间演变规律看,20世纪70年代、80年代和90年代,研究区域4月和10月的10cm地温在时间和空间上的变化均不一致,多站平均值在9.4～14.6℃之间,且从20世纪90年代以来均有明显的升高趋势.
Using the continuous underground temperature data derived from 37 meteorological stations located in Gansu Losses Plateau from 1971 to 2000, and the distribution characteristics and time trends of the underground temperatures at 10 cm were analysed in this paper. The results showed that the mean underground temperatures at 10 cm in April and October are higher than 10℃. But the spatial distribution doesn't belong to the general principle that it is higher in the southeastern part and lower in the northwestern part. It has three high centers in April:one appears at Lanzhou with the value of 14.3℃, another at Tianshui with 14.1℃,the third one at Jingchuan with 12.9℃. It has two low centers: one appears at Dongxiang with the value of 8.3℃, the other at Huanxian with 9.2℃. It has two high centers in October: one appears at Jingyuan with the value of 12.3℃, the other at Beidao with 13.1℃, and one low center at Dongxiang with 8.1℃. The time trends of the underground temperature at 10cm in April and October are different in 1970s,1980s and 1990s,and mean value are about 9.4~14.6℃.Since 1990 s,it has a significant increasing trend.
出处
《甘肃科学学报》
2004年第3期54-57,共4页
Journal of Gansu Sciences
基金
中国科学院农业项目办公室(NK十五-2001-01)
中科院资源环境科学信息中心主任基金(2003-06)资助
关键词
甘肃
黄土高原
地温
气候
Gansu
the losses plateau
underground temperature
climate
