【摘要】 在宁夏固原上黄试验区,对灌木林地、农地、天然草地、果园和人工草地上5种土壤的化学性质进行了分析,并探讨了土地利用方式对土壤化学性质的影响。结果表明:1碱解N表现为灌木林地>农地>人工草地>天然草地>果园;全N表现为天然草地≈灌木林地>农地>人工草地>果园;速效P为果园>农地>天然草地>人工草地>灌木林地;速效K为天然草地>果园≈农地>人工草地>灌木林地;有机质表现为天然草地=农地>灌木林地>人工草地>果园;阳离子交换量(CEC)为灌木林地>人工草地>农地>天然草地>果园;不同利用方式间pH差异不大。2不同种植年限的灌木林地和天然草地上土样间变异性较大,农地次之,而果园各土样间变异性不大。3在垂直剖面上,灌木林地的碱解N、速效K及有机质含量均为表层高于下层,而速效P、全N及CEC为表层低于下层;天然草地的所有养分含量除速效氮及全氮外,其他均为表层高于下层,但上下变化不剧烈;农地和人工草地主要养分含量及CEC表层高于下层;果园的CEC为表层低于下层,其他指标则为表层高于下层。4天然草地和灌木林地为同类地区最佳利用方式。更多还原

【Abstract】 In experimental region Shanghuang,Guyuan,Ningxia,the soil chemical properties of bush land,farmland,natural meadow,orchard and artificial meadow had been studied in this paper.The results showed:① Available nitrogen of soil was:bush land>farmland>artificial meadow>natural meadow>orchard,total nitrogen of soil natural:meadow≈bush land>farmland>artificial meadow>orchard,available phosphor of soil:orchard>farmland>natural meadow>artificial meadow>bush land,available potassium of soil:natural meadow>orchard≈farmland>artificial meadow>bush land,organic substance of soil:natural meadow=farmland>bush land>artificial meadow>orchard,cation exchange capacity of soil:bush land>artificial meadow>farmland>natural meadow>orchard,And pH of soil under different uses showed no remarkable differences.② Different ages of bush land and natural meadow had distinct differences,farmlands next,while no differences for orchards.③ In soil profile,the contents of available nitrogen,potassium and soil organic substance of soil in top layer of bush land were higher than those in sub-top layer,while the contents of available phosphor,total nitrogen and CEC of soil were lower than those in sub-top layer;the soil nutrients in top layer of natural meadow were a little higher than in sub-top layer except available nitrogen and total nitrogen;The main nutrients contents and CEC content in top layer of farmland and artificial meadow were higher than in sub-top layer;CEC in top layer of orchard was lower than that in sub-top layer while other indexes remain the same with those in farmland.④ Natural meadow and bush land were the best utlization modes in the same region.更多还原