Precise knowledge of the soil organic carbon (SOC) stocks under various land uses is needed to meet the Kyoto Protocol and for the sustainability of natural resources. The purpose of the present study was to (1) gauge the depth and spatial distribution of the soil bulk density (BD), soil organic carbon (OC) stocks, and soil organic matter (OM) among the various land uses in the northern Nile Delta in Egypt; (2) estimate the soil carbon sequestration rate (CSR) under different land uses in the region; and (3) establish baseline data for SOC stocks in future studies on the dynamics of SOC. The study area was divided into ten sampling zones to represent each land use in the northern Nile Delta. Each sampling zone was further divided into four sampling sites to represent virgin lands and fish farms, and twelve sites were used to represent three crop types and four cultivation histories. The crops included clover, (Trifolium alexandrinum L.), sugar beet (Beta vulgaris L.), and rice, (Oryza sativa L.) and the years spanned were 5, 15, 30 and 50. The effects of the crop type on the SBD, SOC content, and SOC stocks were significant. In general, the SOC stocks increase as the number of years of cultivation increased. Thematic maps were produced using Geographical Information Systems (GIS) mapping. The Inverse Distance Weighted (IDW) technique in ArcGIS10.4 software revealed that the spatial pattern of the SBD, OC content, and stocks conformed to the soil analysis results. The SOC stocks of the croplands and fish farms were 1.6 and 1.5 times higher, respectively, compared to those of virgin land. Rice cropland had the lowest SBD (1.34 g cm⁻³) and the highest OC stocks (7.46 g C kg⁻¹). The conversion of virgin land into croplands or fish farms actively contributed to the carbon storage rate (CSR).

为了满足《京都议定书》和自然资源的可持续性，需要对各种土地利用下的土壤有机碳（SOC）储量有确切的了解。本研究的目的是（1）在尼罗河北部各种土地用途中测量土壤容重（BD），土壤有机碳（OC）储量和土壤有机质（OM）的深度和空间分布埃及三角洲；（2）估算该地区不同土地利用下的土壤碳固存率（CSR）；（3）在未来关于SOC动态的研究中建立SOC存量的基准数据。研究区域分为十个采样区，以代表尼罗河三角洲北部的每种土地利用。每个采样区又分为四个采样点，分别代表处女地和养鱼场，十二个地点被用来代表三种作物类型和四种耕种历史。作物包括三叶草，（Trifolium alexandrinum L.），甜菜（Beta vulgaris L.）和水稻（Oryza sativa L.）的年限分别为5、15、30和50。作物类型对SBD，SOC含量，和SOC存量很大。通常，随着种植年限的增加，SOC储量也随之增加。专题图是使用地理信息系统（GIS）绘制的。ArcGIS10.4软件中的距离反比加权（IDW）技术表明，SBD，OC含量和储量的空间格局符合土壤分析结果。与原始土地相比，农田和养鱼场的SOC分别高出1.6倍和1.5倍。稻田的SBD最低（1.34 g cm ^-3）和最高的OC库存量（7.46 g C kg ^-1）。原始土地转化为农田或养鱼场对碳储存率（CSR）起到了积极作用。