| 刘梦云,常庆瑞,岳庆玲,王锐.西北农林科技大学资源环境学院，陕西 杨凌 712100[J].干旱地区农业研究,2007,(6):201~206 |
| 西北农林科技大学资源环境学院，陕西 杨凌 712100 |
| College of Resources and Environment Northwest A＆F University，Yangling，Shaanxi 712100，China |
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| DOI：10.7606/j.issn.1000-7601.2007.06.40 |
| 中文关键词: 宁夏固原 土地利用方式 颗粒组成 分形特征 |
| 英文关键词:Guyuan,Ningxia the mode of land use the components of soil particle fractal dimension |
| 基金项目:国家自然科学基金(30571527)； “十一五”国家科技支撑计划林业项目(2006BAD09B0603)； 2006年西北农林科技大学“创新团队支持计划”项目 |
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| 中文摘要: |
| 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5种利用方式土壤的化学性质、颗粒组成与其分形特征之间的关系进行了分析和研究。结果表明:①土壤砂粒含量与土壤分形维数存在一定的相关性;粘粒含量与土壤分形维数表现出极显著正相关,即粘粒含量越高其分形维数越大;②灌木林地随着种植年限的增长,粘粒含量增多,分形维数也增加;而果园随种植年限的增长,粘粒含量减少,分形维数降低;不同利用方式土壤颗粒分形维数变化趋势为天然草地>农地>灌木林地>果园>人工草地;③影响土壤颗粒分形维数的因素主要有砂粒含量、粘粒含量以及阳离子交换量等,土壤粘粒含量、颗粒分形维数及阳离子交换量三者存在极显著相关,土壤颗粒组成的分形维数可以作为表明土壤发育状况的一个重要指标。 |
| 英文摘要: |
| In Shanghuang experimental region of Guyuan,Ningxia,the fractal features of soil particle size distribution of bush forest land,farmland,natural meadow,orchard and artificial meadow have been studied.And the relationships between fractal dimension of soil particle distribution and selected soil properties have been discussed.The results show that: ① there is some relationship between soil sand content and its fractal dimension;contrary to the former,there is remarkable quantitative relationship between soil clay content and its fractal dimension,that is to say that the more the contents of clay,the more fractal dimension and the higher degree of evolution of soil;② with the longer of bush forest land its clay content and fractal dimension becomes more,while orchard is different at all;soil fractal dimension under different land use tends to natural meadow>farmland>bush forest land>orchard>artificial meadow;③ there exists remarkable quantitative relationship among soil clay content,its fractal dimension and CEC,that is to say that soil fractal dimension can be used as a comprehensively quantitative index to evaluate the evolution of soil properties;soil fractal dimension can mainly be affected by soil sand content,soil clay content and CEC. |
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