摘要
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。
Soil samples were collected from the typical riparian zone in Chongming Island, China. Dissolved organic carbon （DOC） content and excitation-emission matrix （EEM） fluorescence spectrum of soil dissolved organic matter （DOM） were measured using parallel factor analysis （PARAFAC）, and the effect of the soil physical and chemical properties on the distribution of soil DOM was discussed. Results indicated that soil DOC content decreased from the surface to subsurface, and increased from the upland to the buffer zone in the surface layer. 90% of soil DOM was humic-like substance, and 10% was protein-like substance. Humic-like substance （0-30 cm） in surface was much more than that in subsurface, and protein- like substance didn＇t change by depth. Soil DOM decreased with the increasing pH; in a lower salinity, soil DOM and protein-like substance increased with the increasing salinity, while humic-like substance didn＇t change.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2015年第6期8-13,共6页
Environmental Science & Technology
基金
上海市科委计划项目(13231203703)
关键词
崇明岛
河岸带
溶解性有机质
三维荧光光谱
平行因子分析
Chongming Island
riparian zone
dissolved organic matter （DOM）
excitation-emission matrix （EEM）
parallel factor analysis
