西北地区东部耕作层土壤湿度近22年变化分析  

Analysis of the variation of shallow soil moisture in the east of Northwest China in recent 22 years

作　　者：高蓉[1,2] 陈少勇[2] 董安祥[1] 张晓芬[2] 

机构地区：[1]中国气象局兰州干旱气象研究所,甘肃省干旱气候变化与减灾重点实验室,中国气象局干旱气候变化与减灾重点开放实验室,甘肃兰州730020 [2]白银市气象局,甘肃白银730900

出　　处：《干旱地区农业研究》2008年第6期186-190,195,共6页Agricultural Research in the Arid Areas

基　　金：科技部科研院所社会公益研究专项“西北农作物对气候变化的响应及其评价方法”(2005DIB3J100)资助

摘　　要：利用西北地区东部17个测站1981～2002年3～10月固定地点测得0～30 cm土壤湿度资料,分析了近22 a来西北地区东部耕作层土壤湿度的空间变化和时间变化。结果表明:土壤湿度自西南向东北减少;1981～2002年呈现明显下降趋势,20世纪80年代前半期处于峰值;湿度变化大多有5～6 a的周期,1986～1988年为较为一致的干旱时期;春、夏、秋三季中春季湿度最小,秋季最大;22 a中春、秋季湿度下降明显,显著减少区位于陇中。Using 0-30 cm soil moisture data per ten days during March to October from 1981 to 2002 in fixed locations of 17 meteorological stations, the temporal and spatial variations of shallow soil moisture in the east of Northwest China in recent 22 years were analyzed. The results show that soil moisture reduced from southwest to northwest. It had an obvious down tendency from 1981 to 2002, and it reached its peak in the first half of the 1980s. Soil moisture variable cycle is mostly 5 to 6 years. The period from 1986 to 1988 was a more consistent time of drought. Among spring, summer and autumn, the soil moisture in spring was the smallest and it was the largest in the autumn. In the past 22 years, soil moisture was reduced significantly in spring and autumn,especially in central Gansu.

关 键 词：土壤湿度 时空变化 西北地区东部 

分 类 号：S152.73[农业科学—土壤学]