半干旱地区流动沙地土壤湿度变异及其对降水的依赖  

Variability of Soil Moisture of Shifting Sandy Land and Its Dependence on Precipitation in Semi-arid Region

作　　者：何志斌[1] 赵文智[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000

出　　处：《中国沙漠》2002年第4期359-362,共4页Journal of Desert Research

基　　金：国家重点基础研究发展规划项目"中国北方沙漠化过程及其防治研究"(G2 0 0 0 0 4870 4);中国科学院寒区旱区环境与工程研究所知识创新课题 ( 2 10 0 49)资助

摘　　要：应用半干旱区科尔沁沙地 1983— 1990年 5～ 10月份土壤湿度定点观测资料 ,对流动沙地土壤湿度的时空变异及其与降水关系进行了研究。结果表明 :半干旱区科尔沁沙地 ,在 0～ 30 0cm的垂直剖面上 ,以 2 0cm作为一个层次 ,流动沙地土壤湿度多年平均值变化于 3 2 5 %～ 3 47% ,层次间无显著差异。在时间序列土壤湿度存在年内和年际变异 ,5月份的土壤湿度与 6～ 10月份存在显著差异 ,但 6～ 10月份之间土壤湿度差异不显著。年际间降水量变化于 2 43 3～ 5 6 7 1mm (变异系数 95 0 5 % )之间 ,流动沙地土壤湿度变化于 3 10 %～ 3 6 9% (变异系数18 6 8% )之间。 0～ 40cm土壤湿度与前月降水量不显著相关 ,但 40～ 30 0cm土壤湿度与前月降水量显著相关 。Soil moisture data from May to October during 1983 to 1990 at Naiman on Horqin Sandy Land are applied to study the temporal and spatial variability of soil moisture in shifting sandy land, and to approach its dependence on precipitation. The mean soil moisture at the depth of 0～300 cm varies between 3.25% and 3.47%, and with not significant difference between layers. On the other hand, soil moisture exhibits temporal variability. Soil moisture on May is different significantly from that on June, July, Aug. Sept. Oct. respectively. However, soil moistures on June, July, Aug. Sept. Oct. are not different significantly from each other. Although annual precipitation varied from 243.3 mm to 567.1 mm with a variance coefficient of 95.09% during 1983-1990 at Naiman, soil moisture in shifting sandy lands varied only from 3.10% to 3.69% with a variance coefficient of only 18.68%. Soil moistures at all profiles are correlated with the monthly precipitations. Furthermore, soil moisture at depth from 0 to 40 cm has not significant correlation with the precipitation in former month, but that at depth from 40 cm to 300 cm does.

关 键 词：半干旱地区 科尔沁沙地 流动沙丘 土壤湿度 降水量 数据处理 

分 类 号：S288[农业科学—农业水土工程] S152.7[农业科学—农业工程]