| 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。 |
| 关键词: 宁夏固原 土地利用方式 土壤化学性质 土壤剖面特征 最佳利用方式 |
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| 基金项目:国家“十五”科技攻关项目(2001BA606A-04)；国家自然科学基金资助项目(30170790) |
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| Features of soil chemical property under different land use |
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| 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. |
| Key words: Shanghuang Guyuan Ningxia land usage modes soil chemical property soil profile property the best utlization modes |
