开都河流域下游绿洲土壤粒度特征分析

Characteristics of Soil grain size in the lower reaches of Kaidu River Basin

通过野外调查,实地测点以及土壤采样分析,以开都河流域下游绿洲为研究区,利用SPSS与DPS等软件对粒度参数特征值进行统计分析。研究结果表明:研究区土壤多为由以粉砂粒为主的质地组成,三层粒级百分含量合计平均值分别达85.92%,85.54%和84.23%;研究区粒度总平均值为6.30Φ;研究区内土壤颗粒分选系数总平均值为1.55Φ,分选性差;偏度总平均值为0.02Φ,多属近对称至正偏;峰态值总平均值为1.24Φ,偏高,呈现窄和较窄峰态,表明研究区土壤成土母质来源相对比较复杂;研究区的平均粒径与分选,分选与偏度呈负相关,平均粒径与偏度正相关,分选系数与峰态呈不显著负相关;平均粒径与偏度、偏度与峰度无相关性;研究区沉积环境主要是浅海、河湖相和河流沉积。

Based on field investigation in Kaidu River Basin, the grain size parameters of soil were analyzed using SPSS and DPS software. Results of the study showed that the soil grounds of the area dominated by silt texture component,and the average values for three fractions content were 85.92%, 85.54% and 84.23%, respectively. The average main diameter was 6.30Ф. Sorting features of soil particles of the study area was 1.55Ф. Skewness was mostly very positively skewed （0.02Ф）. The kurtosis value was 1.24Ф, and was on the high side, and appeared a relatively narrow peak state, which reflecting the soil parent material in the study area was relatively complex. The main diameter and sorting feature were negatively correlated, and the same trend was observed between the sorting feature and kurtosis. The sorting feature and skewness showed no significant correlation. The mean diameter, skewness and kurtosis were uncorrelated. The sedimentary environment of the area was mainly shallow sea, rivers and lakes and sediment.