资助项目:自然资源部公益性行业科研专项项目“毛乌素沙地土地综合整治技术研究及示范应用”(201411008)
第一作者:程杰(1986—),女,重庆万州人,工程师,博士研究生,主要从事水资源系统工程、土地整理复垦、土地工程和项目管理等相关研究工作。E-mail:568761241@qq.com 通信作者:解建仓(1963—),男,陕西眉县人,教授,博士生导师,主要从事水资源及水利信息化研究。E-mail:jcxie@mail.xaut.ed
为探讨砒砂岩与沙复配成土后土壤颗粒及质地变化,采用不同比例的砒砂岩与沙(1:1,1:2,1:5)复配成土进行了小区试验。对种植N年的砒砂岩与沙混合后的复配土颗粒特征及质地变化进行了分析。结果 表明:(1)1:1复配土中粉粒(0.002~0.05 mm)含量较高,占49.37%,1:2,1:5复配土主要是砂粒(0.05~2 mm),含量分别为52.74%,75.55%。(2)复配土颗粒体积分形维数表现为1:1>1:2>1:5>0:1;(3)土壤体积分形维数和黏粒体积含量呈显著的正相关关系,而与粉粒和砂粒的体积含量相关性较小;(4)在风沙土中添加不同比例的砒砂岩后,砂土(0:1)质地逐步发生从砂土—壤砂土(1:2,1:5)—砂壤土(1:1)—粉砂壤(1:1)的转变。结论 表明:土壤颗粒越细粒,土壤颗粒体积分形维数越高,可很好地表征沙地质地结构变化; 随着种植年限的增加,1:1复配土地质地变化最为显著。砒砂岩中的黏粉粒改善了风沙土结构,表明砒砂岩可作为改良风沙土的材料。
In order to investigate the changes of soil particles and texture after the sandstone and sand were incorporated into soil, different ratios of soft rock and sandy soil(1:1, 1:2, 1:5)were used to form soils for plot experiment. The particle characteristics and texture changes of the soft rock and sandy soil-compounded soils with several years of plant growth were analyzed. The results showed that:(1)the silt content of the compound soil of 1:1(0.002~0.05 mm)was higher, accounting for 49.37%, compound soils of 1:2 and 1:5 were mainly composed of sand(0.05~2 mm), the contents was 52.74% and 75.55%, respectively;(2)the fractal dimension of compound soil particles decreased in the order 1:1>1:2>1:5>0:1;(3)there was a significant positive correlation between soil volume fractal dimension and clay volume content, correlations of soil volume fractal dimension with the volume content of silt and sand were weak;(4)while adding different proportions of soft rock in the sandy soil, the texture of sand(0:1)gradually changes from sand loamy soil(1:2, 1:5)to sand loam soil(1:1)and silty soil(1:1). The conclusions of the study indicate that the finer the grain size of the soil is, the higher the fractal dimension of the soil particle volume is, which can well characterize the structural change of the soil texture of structure of sandy land. The texture change of compounded soil(1:1)was the most significant. The clay and silt particles in sandstone improves the structure of aeolian sandy soil, which indicates that sandstone could be used as the material for improving aeolian sandy soil.