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为了研究盐城滩涂不同植物带土壤剖面有机质含量及其分布规律,分析比较了滩涂互花米草(Spartina alterniflora)滩涂、光滩、芦苇(Phragmites australis)滩涂土壤剖面和不同粒径中有机质含量的分布特征;利用傅里叶红外光谱技术,研究了不同植物带对土壤胡敏酸结构和功能基团的影响。结果表明,互花米草滩涂土壤中有机质含量最大,其他依次为芦苇滩涂、光滩;在垂直方向,土壤有机质含量由表层向深层递减。土壤胡敏酸和富里酸含量与有机质含量变化趋势相同。剖面土壤0.2~0.02 mm粒径的土壤颗粒占所有粒径土壤颗粒的比例最高,光滩40~60 cm土层、互花米草滩涂40~60 cm土层、芦苇滩涂20~40 cm土层的0.2~0.02 mm粒径的土壤颗粒比例分别达到91.2%、85.5%和84.1%。土壤胡敏酸的红外图谱结果显示,不同生态带胡敏酸的光谱吸收峰值位置和幅度大部分一致,在500~1 500 cm-1处吸收峰的数量和幅度有显著差异,表明不同生态带土壤的胡敏酸结构存在差异。互花米草滩涂土壤有机质和胡敏酸含量显著高于芦苇滩涂,且两者都显著高于光滩,表明植物促进土壤有机质和胡敏酸的积累,不同种植物带来的积累速率不同。
In order to study the organic matter content and distribution of soil profile in Yancheng shoal of different plantation soils, the distribution of organic matter in soil profile and different particle size of Spartina alterniflora, Phragmites australis was analyzed. The effects of different plant belts on soil humic acid structure and functional groups were studied by Fourier transform infrared spectroscopy. The results showed that the soil organic matter content of Spartina alterniflora was the largest, followed by reed beach and light beach. In the vertical direction, soil organic matter decreased from surface to deep. Soil humic acid and fulvic acid content and organic matter content trends the same. The proportion of soil particles with the diameter of 0.2-0.02 mm in soil profile was the highest in all soil particle sizes. The soil layer of 40-60 cm in Guangtan, 40-60 cm in Spartina alterniflora and 20-40 cm in reed beach The proportion of soil particles with diameter of 0.2-0.02 mm reached 91.2%, 85.5% and 84.1% respectively. The results of infrared spectroscopy of soil humic acid showed that most of the spectral absorption peaks and amplitudes of humic acids in different ecological zones were mostly consistent with each other. The number and amplitude of absorption peaks at 500-1 500 cm-1 were significantly different, indicating that different ecological zones Soil humic acid structure differences. The content of soil organic matter and humic acid in Spartina alterniflora was significantly higher than that in reed tidal flat, and both were significantly higher than those in light beach, indicating that plants promoted the accumulation of soil organic matter and humic acid, and the accumulation rates of different plants were different.