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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。
Coastal tidal flat is a special type of land use with low soil organic matter content and huge carbon sequestration capacity. Studying on the temporal and spatial variation of soil organic carbon in the coast beach has important practical significance for understanding the source and sink transformation of soil carbon pool and regulating climate change. In this paper, the geostatistics and geography information system combined with the “Jiangsu Province coastline changes map”, the study of the Dongtai coast beach in different soil layers (0 ~ 5cm, 5 ~ 10cm, 10 ~ 20cm, 20 ~ 30cm, 30 ~ 40cm, 40 ~ 60cm, 60 ~ 80cm, 80 ~ 100cm, 0 ~ 100cm) The results showed that: (1) the average content of soil organic carbon in the study area varied from (2.01 to 10.16) g / kg; (2) Soil organic carbon in different soil layers showed strong spatial autocorrelation, moderate intensity autocorrelation and constant variation ; (3) Based on the results of ordinary Kriging interpolation, the organic carbon content of paddy soils in the Tiesi region ranges from 5.75 to 16.87 g / kg, kg; (4) The soil organic carbon content of soil layers at various depths showed the stripe-like change characteristic with the renewal of soil age, accompanied by the characteristics of localization and plaque; (5) Soil The annual average change of organic carbon content is about 0.0017g (/ kg? Year), about 0.0055g (/ kg? Year) at the centennial scale and about 0.0048g (/ kg? Year) at the ten-year scale. The study shows that the soil organic carbon content of coastal tidal flat in Dongtai City decreases with the decrease of reclamation age and the depth of soil layer, and has some spatial and temporal variability.