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采集崇明岛典型河岸带不同区域土壤剖面样品,测定了河岸带土壤溶解性有机碳(dissolved organic carbon,DOC)和溶解有机质(dissolved organic matter,DOM)的荧光光谱,通过平行因子分析分析了河岸带土壤溶解有机质组成和垂直分布特征,探讨了土壤中p H和盐度对河岸带土壤有机质分布的影响,为溶解性有机质的迁移提供依据。结果表明:土壤DOC从表层到底层呈现逐步减少的趋势,表层土壤DOC从陆上区向缓冲区有累积效果,而河岸带的破坏使得这种累积效果消失。土壤DOM分布特征与DOC分布基本一致,其中类腐殖质组分占总量的90%左右,类蛋白质占10%左右,表层土壤(0~30 cm)类腐殖质物质含量明显高于底层土壤(40~60 cm)含量(P<0.01),类蛋白质物质随土壤剖面垂直深度变化不明显。土壤DOM含量随p H升高而减少;在低盐度范围内,土壤类蛋白组分随盐度的升高而增加,类腐殖质组分不受盐度影响。
The samples from different regions of the typical riparian zone of Chongming Island were collected to measure the fluorescence spectra of dissolved organic carbon (DOC) and dissolved organic matter (DOM) in the riparian zone. By using the parallel factor analysis, The composition and vertical distribution of soil dissolved organic matter were discussed. The effects of p H and salinity in the soil on the distribution of soil organic matter in the riparian zone were discussed, which provided the basis for the migration of dissolved organic matter. The results showed that the DOC tended to decrease gradually from the surface to the bottom, and the surface soil DOC had a cumulative effect from the land area to the buffer zone. The destruction of the riparian zone made the cumulative effect disappear. The distribution characteristics of soil DOM are basically consistent with the distribution of DOC, of which the humic components account for about 90% of the total, about 10% for the protein, and the content of the humus for the top soil (0 ~ 30 cm) is obviously higher than that of the bottom soil (40 ~ 60 cm) (P <0.01). The protein-like substances did not change obviously with the vertical depth of soil profile. Soil DOM content decreased with the increase of p H. In the low salinity range, soil protein fractions increased with the increase of salinity, and humus-like components were not affected by salinity.