论文部分内容阅读
利用2006—2009年5—9月科尔沁沙地固定沙丘0~150cm土壤水体积分数监测数据及降水资料,采用偏度、峰度检验法检验了固定沙丘不同月及不同土层土壤水体积分数的正态性,并得到了其正态分布相关参数的估计值及其置信区间;同时,对不同土层、不同月及不同年间的土壤水体积分数变化和差异进行了分析。结果表明:(1)固定沙丘同一月的土壤水体积分数以显著性水平α=0.1通过正态分布的假设检验;固定沙丘土壤水体积分数的平均值范围1.82%~4.95%,主要集中在2%~4%;(2)受降水影响,固定沙丘7月土壤水体积分数较高,且与其他月的差异显著;7月土壤水体积分数均值和方差的点估计及置信水平为0.95的置信区间、统计特征均与其他月的有较大差异;(3)固定沙丘0~10cm土壤水体积分数较低,且与其他土层有显著差异;而10~30cm土壤水体积分数较高;(4)2008年土壤水体积分数较低,而2009年土壤水体积分数较高;除2007年与2008年土壤水体积分数没有显著差异外,其余年份间的土壤水体积分数均有显著差异。
Using the monitoring data of 0-150 cm soil water volume and the precipitation data from May to September in Horqin Sandy Land from May to September in 2006-2009, the skewness and kurtosis test were used to test the volume fraction of soil water in different months and different layers of fixed sand dune The normality and the estimated values and their confidence intervals of the parameters related to their normal distribution were obtained. At the same time, the changes and differences in the volume fraction of soil water in different soil layers, in different months and in different years were analyzed. The results showed that: (1) The soil water volume fraction of the same month in the fixed sand dunes was tested by the hypothesis of the normal distribution with the significance level α = 0.1. The mean value of the soil water volume fraction in the fixed dunes ranged from 1.82% to 4.95% % ~ 4%; (2) Due to the influence of precipitation, the volume fraction of soil water in fixed dunes was higher in July and significantly different from other months. The point estimate of soil water volume fraction and variance in July and the confidence level of 0.95 (3) The volume fraction of 0-10 cm soil water in the fixed sand dunes was lower and significantly different from other soil layers, while the soil water volume fraction in the 10-30 cm soil layer was higher. 4) In 2008, the volume fraction of soil water was lower, while the volume fraction of soil water in 2009 was higher. There was a significant difference in soil water volume fraction in other years except for the significant difference in the volume of soil water between 2007 and 2008.