| 民勤绿洲荒漠交错带不同土地覆被下土壤养分分布特征 |
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| 引用本文： | 孙朋,巩杰,王玉川,谢余初.民勤绿洲荒漠交错带不同土地覆被下土壤养分分布特征[J].水土保持通报,2013,33(3):53-57,164. |
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| 作者姓名： | 孙朋 巩杰 王玉川 谢余初 |
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| 作者单位： | 兰州大学西部环境教育部重点实验室,甘肃兰州,730000 |
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| 基金项目： | 国家自然科学基金项目"民勤绿洲荒漠过渡带土地覆被变化的土壤环境效应研究"，国家科技支撑计划课题"气候变化对沙漠化影响与风险评估技术"，教育部新世纪人才计划项目"干旱区内陆河流域生态安全定量评价与时空格局分析:以石羊河流域为例" |
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| 摘 要： | 以西北干旱区民勤绿洲荒漠交错带为例,选取民勤沙生植物园、东坝镇、苏武山等8个样带221个样点开展不同土地覆被类型下的土壤养分含量及土壤肥力综合评价研究.结果表明:(1)土壤有机质含量表现为绿洲区＞绿洲荒漠过渡带＞荒漠区的梯度变化；受人类活动影响和荒漠景观特征的影响,不同样带内土壤养分含量离散程度较大,变异系数为16.67％～410.68％,且土壤养分样带内变异程度基本呈现出沿荒漠—绿洲荒漠交错带—绿洲逐渐增加的趋势.(2)荒草地、灌木林地、乔木林地和裸地的土壤N,P,K含量主要受土壤质地和植被类型的影响而呈现出差异.(3)不同土地覆被下土壤肥力质量指数大小为草地(0.552)＞灌木地(0.057)＞乔木地(-0.642)＞裸地(-0.677),草本和灌木具有良好的土壤培肥作用.
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| 关 键 词： | 干旱区 民勤县 绿洲荒漠交错带 土壤养分 土壤肥力质量指数 |
| 收稿时间： | 2012/4/28 0:00:00 |
| 修稿时间： | 2012/7/26 0:00:00 |
Soil Nutrient Characteristics Under Land Covers in Minqin Oasis-Desert Ecotone |
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| SUN Peng,GONG Jie,WANG Yu-chuan and XIE Yu-chu.Soil Nutrient Characteristics Under Land Covers in Minqin Oasis-Desert Ecotone[J].Bulletin of Soil and Water Conservation,2013,33(3):53-57,164. |
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| Authors: | SUN Peng GONG Jie WANG Yu-chuan and XIE Yu-chu |
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| Institution: | Key Laboratory of Western China's Environmental Systems of the Ministry of Education, Lanzhou University, Lanzhou, Gansu 730000, China;Key Laboratory of Western China's Environmental Systems of the Ministry of Education, Lanzhou University, Lanzhou, Gansu 730000, China;Key Laboratory of Western China's Environmental Systems of the Ministry of Education, Lanzhou University, Lanzhou, Gansu 730000, China;Key Laboratory of Western China's Environmental Systems of the Ministry of Education, Lanzhou University, Lanzhou, Gansu 730000, China |
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| Abstract: | Minqin oasis-desert ecotone,located in the northwest arid area of China,was selected to conduct a comprehensive evaluation research on the differences of soil nutrients and soil fertility under different land cover types.8transects and 221sampling points were made,including Minqin desert botanic garden,Dongba township and Suwu Mountains.Results showed that:(1)Soil organic content varied in the order of oasis area>oasis-desert ecotone>desert.Discrete degree of soil nutrient content for different transects was large as the CVchanges from 16.67%to 410.68%,as affected by human activities and desert landscape characteristics.The variation of soil nutrient with different land cover types tended to increase from desert to desert-oasis ecotone and then to oasis in the transects.(2)There were differences in the contents of soil N,P and K among grassland,shrub land,forestland and wasteland due to different human activities,soil types,soil textures and vegetation types.(3)Soil fertility quality index varied in the order of grassland(0.552)>shrub land(0.057)>forestland(-0.642)> bare land(-0.677),which shows that grass and shrub has a good improvement effect on soil fertility. |
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| Keywords: | arid area Minqin County oasis-desert ecotone soil nutrient soil fertility quality index |
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