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选择我国西南地区代表性水耕人为土剖面,对其主要诊断层黏土矿物组成特征进行研究。采用沉降吸管法提取土壤黏粒,将其进行Mg2+饱和、Mg2+饱和加甘油处理、K+饱和加热550℃三种处理后,分别在X-射线衍射仪扫描,对所获图谱进行黏土矿物组成鉴定。实验结果显示西南地区代表性水耕人为土其诊断层黏粒黏土矿物组成特征主要为蛭石,高岭石,伊利石,混层矿物等。含少量其它黏土矿物如三水铝石,蒙脱石等。与旱地土壤比较,水耕人为土的黏土矿物组成有明显的不同。不同发育时间和水耕熟化的水耕人为土,其黏土矿物组成和数量上也有明显差异,研究结果对黏土矿物在水耕人为土系统分类上的应用具有一定的理论意义。
The representative hydroponic man-made soil profile in southwestern China was selected to study the composition of clay minerals in the main diagnostic layers. The clay particles were extracted by sedimentation pipette method, and then were subjected to Mg2 + saturation, Mg2 + saturation and glycerol treatment, K + saturated heating at 550 ℃ for three times, respectively. The clay particles were identified by X-ray diffraction. The results show that the diagnostic clay mineral composition of the representative hydroponics artificial soil in Southwest China are mainly vermiculite, kaolinite, illite and mixed mineral. With a small amount of other clay minerals such as gibbsite, montmorillonite and so on. Comparing with dryland soil, the composition of clay minerals in hydroponic artificial soil is obviously different. The hydroponic man-made soil with different developmental stages and hydroponics has obvious difference in the composition and quantity of clay minerals. The research results have certain theoretical significance for the application of clay minerals in the system classification of hydroponic artificial soil.