ZHANG Haiting,SHI Yanqing.Soil Particle-Size Distribution and Fractal Dimension of Different Land Use Types in Shandong Province[J].Research of Soil and Water Conservation,2018,25(01):126-131,138.
山东省不同土地利用方式土壤颗粒组成及其分形维数特征
- Title:
- Soil Particle-Size Distribution and Fractal Dimension of Different Land Use Types in Shandong Province
- Keywords:
- land use type; soil particle-size; fractal dimension
- 分类号:
- S152.3
- 摘要:
- 选取山东省120个不同土壤剖面，应用分形理论研究不同土地利用方式的土壤颗粒分形特征以及与土壤养分的相关关系。结果表明：（1）不同土地利用方式土壤铵态氮、硝态氮、速效磷、全磷、全氮、有机质含量均表现为林地和草地显著高于耕地和农地（p < 0.05），其中林地和草地土壤铵态氮、硝态氮、速效磷、全磷、全氮、有机质含量差异均不显著（p > 0.05）。（2）不同土地利用方式土壤粒径分布中，黏粒含量占主导地位，黏粒含量百分比45.98%～67.12%，粗砂粒含量相对较低。（3）不同土地利用方式土壤颗粒分布的分形维数随着土层深度增加逐渐增大，0—10 cm土层土壤颗粒分布分形维数变化幅度较小，而40—50 cm变化幅度较大。（4）回归分析表明不同土地利用方式土壤颗粒分形维数与土壤粒径呈显著或极显著的线性负相关。（5）相关分析表明不同土地利用方式土壤分形维数均与土壤有机质含量呈显著负相关，与土壤铵态氮、硝态氮、速效磷、全磷、全氮呈正相关。综上所述，不同土地利用方式下土壤颗粒组成差异较大，草地和林地相对于耕地和农地大颗粒含量明显增多，小颗粒明显减少，土壤颗粒分布的分形维数可以作为表征土壤肥力的状况指标。
- Abstract:
- Taking field sampling, and using laboratory analysis method and the fractal theory of particle volume, we studied soil particle-size distribution and fractal dimension of different land use types. The results showed that:(1) soil ammonium nitrogen, nitrate nitrogen, available phosphorus, total phosphorus, total nitrogen and organic matter content of different land use types were significantly higher in forestland and grassland than those in the cultivated land and farmland (p < 0.05), were not significantly different between forestland and grassland had (p > 0.05); (2) coarse silt was dominant in soil, in addition to the coarse sand grains, the land uses had significant effects on the contents of the rest fractions, the hierarchy was not obvious, and fractal dimension of soil particles was 45.98%～67.12%; (3) fractal dimension of soil particles increased with the soil depth, and there was a lower rangeability in the surface soil layer and a higher rangeability in 40—50 cm soil layer; (4) regression analysis showed that there was a strong negative liner relationship between soil particle-size and fractal dimension; (5) correlation analysis showed that fractal dimension significantly positively related to soil moisture content, and significantly negatively related to soil organic matter content, positively related to soil nutrients. In total, the land uses of loess hilly-gully region have the greater influence on soil particle composition, the particle sizes of grassland and forest land shift from the small particles to the large particles compared with farmland.
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备注/Memo
收稿日期:2017-3-3;改回日期:2017-4-11。
基金项目:山东省水利局创新课题（2015AE2316）；科技部国际科技合作与交流计划项目（2007DFB70200）
作者简介:张海廷,男(1980-),男,山东济宁人,本科,工程师,研究方向:水文水资源、水土保持监测。E-mail:Haiting_zhang80@163.com