摘要
为明确花岗岩崩岗区崩壁土壤理化性质与抗剪强度的空间异质性,进一步量化两者之间的定量关系,以福建省安溪县典型崩岗区崩壁土壤为研究对象,对崩壁垂直(红土层、砂土层和碎屑层)和水平(表层和内部)两个方向不同深度土壤理化性质和抗剪强度的差异进行分析。结果表明:崩壁不同土层表层土壤游离态铁铝氧化物和无定形态铁铝氧化物含量均大于内部土壤,而有机质、pH值、颗粒组成和抗剪强度参数不同土层表层和内部土壤的差异规律不明显;崩壁不同土层土壤性质差异显著,红土层土壤的游离态铁铝氧化物、无定形态铁铝氧化物含量、黏粒、黏聚力最大,碎屑层最小;相关分析表明土壤游离态和无定形态铁铝氧化物、有机质、中粉粒和更小细颗粒与土壤黏聚力呈显著正相关,游离氧化锰、粗粉粒及以上粗颗粒与黏聚力呈显著负相关;内摩擦角与游离氧化铁呈显著正相关;逐步回归分析表明无定形氧化铝、游离氧化铁、细黏粒、细粉粒为影响崩壁抗剪强度的主要土壤因子,根据4个主要影响因子建立了崩壁土壤抗剪强度的预测模型(r=0.96,P<0.01,RMSE=10.44)。
This study aimed to clarify the spatial differentiation of soil geotechnical characteristics in Benggang area and reveal the quantitative relationship betweensoilphysicochemical properties and shear strength.The differences of soil physicochemical properties and shear strength at different depths vertically(red soil,sandy soil and detritus layers)and horizontally(surface and inner soils)were analyzed in a typical Benggang area of Anxi County,Fujian Province,China.The contents of free and amorphous iron and aluminum oxides in surface soil exceeded those in the inner soil for the three soil layers.There were no obvious differences in organic matter,pH value,particle composition,and shear strength parameters between the surface and the inner soils.Significant differences were found in soil properties among the different soil layers of gully wall.The contents of free and amorphous iron and aluminum oxides,and clay particles of the red soil layer were the greatest,and the cohesion of red soil layer was the largest.The smallest values were obtained for the detritus layer.Correlation analysis revealed significant positive correlation between free and amorphous iron and aluminum oxides,organic matter,medium silt and smaller fine particles,and soil cohesion.Significant negative correlation was found between free manganese oxide,coarse silt and larger coarse particles,and soil cohesion.The internal friction angle positively correlated with free iron oxide.Stepwise regression analysis showed that amorphous aluminum,free iron oxide,fine clay particles,and fine silt particles were the main soil factors affecting the soil shear strength of the gully wall(r=0.96,P<0.01,RMSE=10.44).
作者
郑勤敏
王祖梅
黄奕铭
林金石
黄炎和
张越
ZHENG Qinmin;WANG Zumei;HUANG Yiming;LIN Jinshi;HUANG Yanhe;ZHANG Yue(College of Resources and Environment,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;Technology Innovation Center for Monitoring and Restoration of Ecologically Fragile Areas in Southeast China,Ministry of Natural Resources,Fuzhou,Fujian 350013,China)
出处
《森林与环境学报》
CSCD
北大核心
2022年第1期53-62,共10页
Journal of Forest and Environment
基金
国家自然科学基金"水-热耦合效应下崩壁土壤抗剪强度变化特征与机制研究"项目(41907043)
福建省科技创新项目资金(KY-090000-04-2021-001)
福建农林大学科技创新专项基金项目(CXZX2020074A)。
关键词
崩岗
崩壁
土壤
游离氧化物
无定形氧化物
模型
Benggang
collapsing gully wall
soil
free oxide
amorphous oxide
model