摘要
为预知新疆阜康绿洲农田土壤含水量长期演变规律,采用重标极差分析法计算了该农田3个不同型号中子管测的3个具有代表层次土壤含水量时间序列的Hurst指数及分形维数。结果表明:深度为10cm处Hurst指数值分别为0.8721、0.8299、0.9376;深度为80cm处为0.8840、0.9229、0.9991;深度为150cm处为0.9196、0.9282、0.9454,其标度指数均大于0.5,这揭示了这3个层次的含水量时间序列存在着相同的趋势性。另一方面,深度为10cm处分形维数值分别为1.1279、1.1160、1.0804;深度为80cm处分别为1.1701、1.0722、1.0718;深度为150cm处分别为1.0624、1.0009、1.0546,其值随着土壤深度的增加而减小,揭示了随着深度的增加土壤含水量波动幅度逐渐减弱,这也与实际相符。
To predict the long-term evolution law of soil moisture content in Xinjiang Fukang farmland. Using Rescaled Range Analysis calculates three representative levels of soil moisture time series of Hurst index and fractal dimension by three different models of neutrom Results showed., the values of Hurst at the depth of 10 cm were:0. 872 1,0. 884 0,0. 919 6;at 80 cm were:0. 829 9,0. 922 9,0. 928 2 and at 150 cm were:0. 937 6,0. 999 1,0. 945 4. On the other hand,the values of fractal dimension at the depth of 10 cm were: 1. 127 9,1. 116 0,1.080 4;at 80 cm were: 1. 170 1,1. 077 2,1. 0718 and at 150 cm were: 1.062 4,1.000 9,1. 054 6. It, s value will decrease with the increase of soil depth,which indicates that once siol depth increase,the water content will decrease. It, s also accords with the actual.
出处
《南水北调与水利科技》
CAS
CSCD
北大核心
2015年第B02期174-176,182,共4页
South-to-North Water Transfers and Water Science & Technology
基金
国家自然科学基金(11171043)
关键词
重标极差法
土壤含水量
时间序列
分形维数
rescaled range analysis
soil moisture content
the time series
fractal dimension