东台市海岸滩涂土壤有机碳的时空变化

发布时间：2018-11-21 09:35

【摘要】：海岸滩涂是一种特殊的土地利用类型,土壤有机质含量较低,固碳能力巨大。对海岸滩涂土壤有机碳时空变化规律进行研究,对于了解土壤碳库源汇转化、调节气候变化,具有重要的现实意义。本文应用地统计学与地理信息系统相结合的方法,结合《江苏省海岸线变迁图》,研究了东台市海岸滩涂近6000年以来不同土层(0～5cm、5～10cm、10～20cm、20～30cm、30～40cm、40～60cm、60～80cm、80～100cm、0～100cm)土壤有机碳含量的时空变化特征。结果显示:(1)研究区土壤有机碳平均含量变化范围为(2.01～10.16)g/kg;(2)不同土层土壤有机碳呈现出强烈的空间自相关、中等强度的自相关以及恒定变异;(3)根据普通克里金插值结果,堤西地区的水稻土有机碳含量介于(5.75～16.87)g/kg,堤东地区的潮盐土有机碳含量介于(1.12～4.70)g/kg之间;(4)各剖面深度土层土壤有机碳含量呈现随土壤年代的更新而递减的条带状变化特征,并伴有局部化、斑块化等特征;(5)千年尺度下土壤有机碳含量年均变化值约为0.0017g(/kg?年),百年尺度下约为0.0055g(/kg?年),十年尺度下约为0.0048g(/kg?年)。该文研究表明,东台市海岸滩涂土壤有机碳含量随着围垦年限的减少、土层深度的增加而呈现递减趋势,并存在一定的时空变异性。
[Abstract]:Coastal beach is a special type of land use, soil organic matter content is low, carbon sequestration capacity is huge. The study on the temporal and spatial variation of soil organic carbon in coastal tidal flat is of great practical significance for understanding the source and sink transformation of soil carbon pool and regulating climate change. In this paper, using the method of geostatistics and geographic information system (GIS), combined with the "Coastal transition Map of Jiangsu Province", we have studied the different soil layers (0 ~ 5 cm ~ 5 ~ 10 ~ 10 cm ~ (10) ~ 20 cm ~ (20) ~ (20) ~ (30) ~ (30) ~ (30) ~ (40) cm ~ (-1) in Dongtai coastal beach in the past 6000 years. The temporal and spatial variation characteristics of soil organic carbon content were studied. The results showed that: (1) the average content of soil organic carbon varied from (2.01g / kg) to 10.16 g / kg, (2) soil organic carbon in different soil layers showed strong spatial autocorrelation, moderate intensity autocorrelation and constant variation. (3) according to the results of ordinary Kriging interpolation, the organic carbon content of paddy soil in Dixi area was (5.75 ~ 16.87) g / kg, and that of tidal saline soil in east part of dike area was (1.12 ~ 4.70) g/kg. (4) the soil organic carbon content in the deep soil layers of each profile showed the characteristics of strip variation, localization, patch and so on, which decreased with the renewal of soil age. (5) the average annual variation of soil organic carbon content is about 0.0017g (/ kg?) at the millennium scale. About 0. 0055g (/ kg?) on a centennial scale. About 0. 0048 g (/ kg?) on a 10-year scale. The study shows that the soil organic carbon content of Dongtai coastal beach soil decreases with the decrease of reclamation years and the depth of soil layer increases, and there is a certain temporal and spatial variability.
【作者单位】：南京财经大学公共管理学院;南京信息工程大学地理与遥感学院;南京工业大学测绘科学与技术学院;
【基金】：国家自然科学基金项目(41201215;41401629) 江苏高校优势学科建设工程资助项目
【分类号】：S153.6

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