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选取湘东丘陵区四种典型母质发育土壤(酸性紫色土、花岗岩红壤、板岩红壤和第四纪红土红壤),采集剖面(深至母岩/母质层)样品,应用傅里叶变换红外光谱仪研究灼烧去除有机质处理、土层深度和母质类型对土壤中红外吸收光谱特征的影响,分析吸收光谱与土壤理化性质的关系。结果表明,去除有机质后,特征区的中红外吸收值升高,反映矿物质对红外吸收谱线的强烈影响。在剖面上,底土(60~80 cm或100~120 cm)的中红外吸收值高于表土(0~20 cm),与土壤有机质含量的剖面分布相反。四种土壤的中红外光谱均属典型的高岭石图谱。砂粒、粘粒含量与红外吸收值的相关性最好,砂粒含量的最大相关系数(0.51)出现在3700、913和720~540 cm~(-1)附近,粘粒含量的最大相关系数(0.54)出现在1100~694 cm~(-1);本研究表明,原土的中红外吸收光谱特征主要受矿物质的支配,可以很好地反映土壤质地的状况,指示土壤质量变化。
Four typical parent material development soils (acidic purple soil, red soil of granite, slate red soil and lateritic laterite laterite) were selected from the hilly region of eastern Hunan Province to collect the samples (depth to the parent rock / parent material), and Fourier transform infrared spectroscopy The effects of burning organic matter removal, soil depth and parent material types on the infrared absorption spectra of soils were studied. The relationship between absorption spectra and soil physical and chemical properties was analyzed. The results showed that after removal of organic matter, the mid-infrared absorption of the characteristic area increased, reflecting the strong influence of minerals on the infrared absorption spectrum. In the profile, the mid-infrared absorption value of the bottom soil (60-80 cm or 100-120 cm) was higher than that of the top soil (0-20 cm), which was opposite to that of the soil organic matter. The mid-infrared spectra of the four soils are typical kaolinite patterns. The correlation between sand content, clay content and infrared absorption value was the best. The maximum correlation coefficient (0.51) of sand content appeared around 3700, 913 and 720 ~ 540 cm -1, and the maximum correlation coefficient of clay content (0.54 ) Appears at 1100 ~ 694 cm -1. This study shows that the mid-infrared absorption spectrum of native soil is mainly dominated by minerals, which can well reflect the soil texture and indicate the change of soil quality.