土地整理背景下土壤有机碳组分的空间与垂向特征  

Spatial and vertical characteristics of soil organic carbon fractions under the context of land consolidation

作　　者：苏磊[1] 康嘉炜 吴萍 凌云[1] 李娟英[1,4] SU Lei;KANG Jiawei;WU Ping;LING Yun;LI Juanying(College of Oceanography and Ecological Science,Shanghai Ocean University,201306,Shanghai,China;Shanghai Center for Construction Land and Land Preparation,200003,Shanghai,China;Technology Innovation Center for Land Spatial Eco-restoration in Metropolitan Area,MNR,200003,Shanghai,China;Shanghai Engineering Research of River and Lake Biochain Construction and Resource Utilization,201702,Shanghai,China)

机构地区：[1]上海海洋大学海洋科学与生态环境学院,上海201306 [2]上海市建设用地和土地整理事务中心,上海200003 [3]自然资源部大都市区国土空间生态修复工程技术创新中心,上海200003 [4]上海河湖生物链构建与资源化利用工程技术研究中心,上海201702

出　　处：《中国水土保持科学》2025年第2期157-170,共14页Science of Soil and Water Conservation

基　　金：自然资源部大都市区国土空间生态修复工程技术创新中心开放性创新项目“全域土地整治中不同土地利用类型的碳储量变化及GEP核算研究”(CXZX202307)。

摘　　要：本研究旨在厘清土地利用类型与土壤有机碳及其组分结构和含量的变化,以指导土地整理方案并增加土壤碳库和水土保持性能。通过化学分析对上海市10个乡镇的土壤理化性质、土壤有机碳及其组分质量分数、空间与垂直分布进行研究。结果表明:1)土地整理对土壤理化参数的影响较小,土壤有机碳质量分数的地理差异显著。2)种养结合和林湿复合等复合土地利用类型的土壤有机碳质量分数显著大于单一土地利用类型,且土壤溶解性有机碳和土壤微生物量碳的质量分数变化趋势与土壤有机碳类似。3)上层土壤有机碳显著高于下层,呈现出从上至下的埋藏模式。4)整理时间<36个月的样品中土壤有机碳和土壤溶解性有机碳质量分数在上下层间的差异显著高于其他样品。综上,土地整理需考虑区域历史土地用地特点,积极采取复合用地整理,以提高土壤碳库。减少对深层土壤扰动,避免释放已封存的碳。建议对土地整理后土壤有机碳数据进行中、长期监控,以准确评估土地整理活动对于土壤有机碳质量分数的长期影响。[Background]Soil is one of the largest carbon pools.It plays a crucial role in the global carbon cycle and has a profound impact on climate change.Since 2010,Shanghai have gradually initiated land consolidation,integrating farmland improvement,construction land reorganization,and ecological protection and restoration.Changes in land use types are one of the key factors influencing the carbon cycle in terrestrial ecosystems.During the land consolidation in Shanghai,it is crucial to clarify the variations in land use types and their impact on soil organic carbon(SOC),as well as the structure and content of its components.[Methods]Based on the context of comprehensive land consolidation in Shanghai,we selected 10 towns undergoing land consolidation as experimental sites.In August and September 2023,samples were collected from five single land use types:woodland,cropland,grassland,building land,and water,as well as from composite land use types such as combination of planting and farming and forest-wetland composite.For each land use type,soil profiles were established at two depths:the upper layer(0-20 cm)and the lower layer(20-40 cm),resulting in the collection of 61 sampling sites and 122 soil samples.Soil bulk density was measured with the cutting ring method,soil pH with the electrode method,and soil moisture content with the drying method.SOC was determined by potassium dichromate oxidation external heating method.Soil dissolved organic carbon(DOC)was extracted using K_(2)SO_(4) as the extractant and measured with the total organic carbon analyzer,while soil microbial biomass carbon(MBC)was measured using the chloroform fumigation-extraction method.[Results]1)The soil moisture content in samples from different land use types in Shanghai ranged from 19.88% to 34.45%,while soil pH values varied between 7.44 and 8.21,indicating a generally weakly alkaline condition.Soil bulk density ranged from 1.29 to 1.54 g/cm^(3),with land consolidation having a minimal impact on the basic physicochemical parameters of the soil

关 键 词：土壤有机碳 土地利用类型 土地整理 空间特征 垂直分布 

分 类 号：X825[环境科学与工程—环境工程]