| 苟富刚,蔡露明,陆徐荣.连云港耕地土壤有机碳时空分异及影响因素[J].农业环境科学学报,2024,43(10):2363-2374. |
| 连云港耕地土壤有机碳时空分异及影响因素 |
| Spatial-temporal variation and influencing factors of soil organic carbon in arable soils of Lianyungang |
| 投稿时间：2023-10-24 |
| DOI：10.11654/jaes.2023-0876 |
| 中文关键词: 有机碳 耕地 土壤类型 用地类型 人类活动 |
| 英文关键词: organic carbon cultivated land soil type land type human activity |
| 基金项目:省市合作项目连云港城市地质调查(20170821);江苏省人民政府和自然资源部项目(EG0006) |
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| 中文摘要: |
| 为了揭示连云港耕地土壤有机碳（SOC）的时空分布特征及影响因素，选取连云港市耕地土壤作为研究对象，采取表层（0~20cm）土壤及深层（150~200 cm）土壤样品，进行了SOC、总氮（TN）及总磷（TP）的测试。结果表明：2004年SOC含量在中等级分布频率最高，2019年SOC含量在中、中上、高、极高4个等级上均广泛分布。近15 a（2004—2019年）耕地浅表SOC含量增加了0.57个百分点，有机碳密度增加了1.34 kg·m-2，SOC储量增加了1.36 Tg，平均固碳速率为7.26×104 kg·km-2·a-1。不同类型土壤固碳速率差异较大，平均固碳速率表现为灰潮土>滨海盐土>砂姜黑土>棕潮土>棕壤>粗骨土。不同用地类型土壤的SOC含量差异大，平均固碳速率为水田>旱地>水浇地。近15 a研究区土壤C∶N∶P（SOC∶TN∶TP）稍有提高，说明SOC含量空间异质性稍有提高，研究区土壤C∶N∶P数值与江西耕地土壤等相比明显偏低，表明土壤微生物对SOC矿化分解速率较快，研究区耕地土壤环境不利于碳的储存。 |
| 英文摘要: |
| In order to reveal the spatial and temporal distribution characteristics and influencing factors of soil organic carbon（SOC）in Lianyungang arable land, soil samples from the surface layer（0-20 cm）and deep layer（150-200 cm）were collected and tested for SOC, total nitrogen（TN）, and total phosphorus（TP）. The results showed that the SOC content was in the medium had the highest frequency of distribution in 2004. SOC content was widely distributed in four classes：medium, upper medium, high, and very high in 2019. The shallow surface SOC of the arable land increased by 0.57 percentage point, organic carbon density increased by 1.34 kg · m-2, SOC reserves increased by 1.36 Tg, and the average rate of carbon sequestration was 7.26×104 kg·km-2·a-1 in the last 15 years（2004—2019）. The rate of carbon sequestration in soils varied considerably between soil types, with the order of grey tidal soils>coastal saline soils>sandy ginger black soils>brown tidal soils>brown loam>coarse bone soils. The SOC content of soils varied greatly between land types, and the average rate of carbon sequestration was in the order of paddy field>dryland>watered land. Soil C∶N∶P（SOC∶TN∶TP）in the study area had slightly increased over the last 15 years, indicating a slight increase in spatial heterogeneity of SOC content. Soil C∶N∶P values in the study area were significantly lower compared to arable soils in Jiangxi etc, indicating rapid mineralization and decomposition of SOC by soil microorganisms. The arable soil environment in the study area was not conducive to carbon storage. |
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