摘要
为探究南昌城市化强度对土壤粒度组成与分形特征的影响,将南昌市建成区按不透水面面积占比区分城市化强度等级取样调查(184个样方),测定土壤粒度组成、理化性质及植被指标,通过土壤颗粒体积分形维数模型计算分形维数值。结果显示:①南昌城市土壤颗粒以粉粒(46%~59%)和砂粒(40%~53%)为主,高城市化导致土壤中砂粒含量增加,粉粒含量减少。②南昌城市土壤分形维数的变化范围为2.69~2.97,随城市化强度增加呈下降趋势。土壤粉粒与分形维数正相关,砂粒与之相反,粉粒对土壤分形维数的影响最大。③皮尔森相关分析与结构方程模型分析结果共同表明:丰富的地上植被能够减少土壤颗粒的流失,改善土壤物理性质,缓解土壤退化。城市绿地中粉粒、极细砂粒等粒径适中的土壤颗粒保水、保肥更佳,更能反映土壤的质量水平。
To investigate the effects of urbanization intensity on soil particle size composition and fractal characteristics in Nanchang,soils in the built-up areas of Nanchang were sampled according to the impervious surface area as a percentage of the urbanization intensity level(184 plots),soil particle size composition,physicochemical properties and vegetation indexes were determined,and fractal dimension values were calculated by soil particle volume fractal dimension model.The results showed that urban soil particles were dominated by silt particles(46%–59%)and sand particles(40%–53%),and high urbanization increased sand particles but decreased silt particles.The fractal dimension varied from 2.69 to 2.97,which showed a decreasing trend with increasing urbanization intensity.Silt particles were positively correlated with fractal dimension while sand particles were opposite,and silt particles showed the greatest influence on fractal dimension.Pearson correlation analysis and Structural Equation Model analysis showed that abundant vegetation reduced the loss of soil particles,improved soil physical properties,and mitigated soil degradation.In conclusion,soil particles of medium size,such as silts and very fine sands,in urban green spaces can preferably retain water and nutrients and reflect soil quality.
作者
张佛熠
承勇
阳雅荧
韦培
金涛涛
凌婉茹
尹婕
刘玮
王琼
ZHANG Foyi;CHENG Yong;YANG Yaying;WEI Pei;JIN Taotao;LING Wanru;YIN Jie;LIU Wei;WANG Qiong(College of Forestry/Landscape and Art,Jiangxi Agricultural University,Nanchang 330045,China;Jiangxi Provincial Key Laboratory of Forest Cultivation,Nanchang 330045,China;Jinggangshan National Nature Reserve of Jiangxi Province,Jinggangshan,Jiangxi 343600,China)
出处
《土壤》
CAS
CSCD
北大核心
2023年第5期1138-1145,共8页
Soils
基金
国家自然科学基金项目(42007042)
江西省自然科学基金项目(20202BAB215008)
江西省研究生创新专项资金项目(YC2022-s422)资助。
关键词
城市化强度
土壤粒度组成
分形维数
土壤质地
Urbanization intensity
Soil particle size composition
Fractal dimension
Soil texture
