宁夏白芨滩地区风沙土理化性质初步研究

Physicochemical Property of Aeolian Sandy Soil in Baijitan in Ningxia

为了研究宁夏河东沙区白芨滩地区风沙土的理化性质,通过野外调查、采样及室内实验分析,对研究区流动沙丘、半流动沙丘及草方格固定沙丘风沙土理化性质进行了测定分析。结果表明:土壤含水量均较低,土壤含水量的平均值表现为草方格固定沙丘>半流动沙丘>流动沙丘。风沙土土壤粒度组成表现为各层均以细沙颗粒为主,中沙颗粒含量次之,极细沙含量较小。流动沙丘的表层含有非常少量的粗沙颗粒,半流动沙丘和草方格固定沙丘各层几乎没有粗沙颗粒。而草方格固定沙丘的表层含有少量的粉沙颗粒,其余各层均无粉沙颗粒。土壤容重从表层向下逐渐减小,流动沙丘和半流动沙丘容重较为接近,而草方格表层沙土容重明显较小。土壤养分流动沙丘、半流动沙丘和草方格固定沙丘的养分含量较接近,差异不显著,而且各类型沙丘养分的垂直变化无明显规律,变化不稳定。

The study selected desertification combating area of Baijitan in Ningxia, through field investigation,sampling and laboratory experiment, measured and analyzed the physicochemical property of aeolian sandy soil of mobile sand dune, semi-mobile dune and fixed dune, and preliminarily attained the following conclusions：soil moisture were all lower, and the mean value of soil water of the fixed dune semi-mobile dune mobilesand dune. The grain composition of sandy soil was dominated by fine sand, followed by middle sand, and the content of mighty fine sand was very low. A small amount of coarse sand was on the surface of mobile sand dune, and both 〉semi-mobile 〉dune and fixed dune had no coarse sand. And a small amount of silty sand was on the surface of fixed dune. Soil bulk density of sandy soil decreased little by little from surface down, and the soil bulk density of mobile sand dune and semi-mobile dune was approximate, the soil bulk density of the surface of fixed dune was lower. The soil nutrients of mobile sand dune, semi-mobile dune and fixed dune were all very low and approximate, and the vertical variation had no obvious rule and was unstable.