黄河三角洲土地利用对土壤氮素及其转化的影响  

Effects of Land Use on Soil Nitrogen and Its Transformation in Yellow River Delta

作　　者：吕学军[1,2] 陈印平[1] 刘庆[1] 

机构地区：[1]滨州学院山东省黄河三角洲生态环境重点实验室,山东滨州256603 [2]滨州学院建筑与城乡规划系,山东滨州256603

出　　处：《水土保持通报》2011年第4期78-81,共4页Bulletin of Soil and Water Conservation

基　　金："十一五"国家科技支撑计划项目"盐碱地改良沿海防护林体系研究与示范"(2009BADB2B05);山东省自然科学基金项目"基于GIS的黄河三角洲农田土壤有机碳时空变异及其环境响应特征"(ZR2009BL003);滨州学院青年人才创新工程项目(BZXYQN-LG200503BZXYKJ0818);服务滨州行动计划项目(BZXYFB20100416)

摘　　要：以黄河三角洲垦利县轻度盐渍化土壤为研究对象,选取菜地、果园、粮田和新淤未利用地共4种土地利用类型,通过实地采样分析,探讨了土地利用对土壤氮素及其转化的影响。结果表明,全氮含量在0—20 cm土壤中以粮田最高,平均含量为1.42 g/kg,其次是果园、菜地和新淤未利用地土壤,其平均含量分别为1.17,0.97和0.57 g/kg,而20—40 cm土壤中,菜地全氮平均含量为0.86 g/kg,明显高于其它3种用地土壤;硝态氮在菜地0—20 cm土壤中的平均含量为27.25 mg/kg,远高于果园、粮田和新淤未利用地土壤,铵态氮在4种用地类型土壤中含量范围为2.65-4.09 mg/kg,不同用地类型间差异不大,二者在20—40cm土壤中的变化规律与0—20 cm基本相同;通过铵态氮、硝态氮与全氮的相关分析,表明菜地土壤中有效氮含量主要与外源氮素的补充有关,果园和粮田土壤中的有效氮与土壤全氮关系密切而受环境变化情况较小,新淤未利用地土壤氮素反映了研究区土壤氮素及其转化的初始状况。To investigate the effect of land use on soil nitrogen and its transformation in the slightly saline soil,soils under four types of land use were employed,i.e.,orchard,vegetable,cropland and unused new sedimentation land in Kenli County of Yellow River Delta.The results showed that the greatest total nitrogen in top soil layer（0—20 cm） was in the cropland,followed by orchard and vegetable land,and the least was in unused new sedimentation land soil.The mean value from the greatest to the least was 1.42,1.17,0.97 and 0.57 g/kg,respectively.In 20—40 cm soil layer,the average concentration of the total nitrogen was 0.86 g/kg in vegetable soil,which is higher than that in the other three land use types.The average concentration of NO-3—N in 0—20 cm vegetable soil layer is 27.25 mg/kg,far higher than that in orchard,cropland and unused new sedimentation land,while NH^＋4—N in different land use types was similar,ranging from 2.65 to 4.09 mg/kg.Soil NO-3—N and NH^＋4—N concentration in 20—40 cm layer in different land use soils showed the similar changes as those in top layer（0—20 cm）.Through the correlation analysis,the available nitrogen in vegetable soil was mainly from fertilization,and the available nitrogen in orchard and crop land soils was closely correlated with the total nitrogen and was little affected by environment change.The concentration and transformation of nitrogen in unused new sedimentation land soil reflected the initial status of the study area.

关 键 词：土地利用 土壤氮素 氮转化 黄河三角洲 

分 类 号：S156.91[农业科学—土壤学]