摘要
目前激光衍射法(laser diffraction method,LD)逐步被用于土壤颗粒粒径分布(particle size distribution, PSD)的分析,为了对比LD法和吸管法测定东北黑土区土壤PSD的差异性,采用LD法和吸管法分别对东北黑土区宾州河流域36个土壤剖面不同层次178个土壤样品的PSD值进行了测定与分析。结果表明,同吸管法相比,LD法低估了土壤的黏粒含量,平均低估幅度19.69%,而高估了土壤的粉粒和砂粒含量,平均高估幅度分别为14.66%和5.13%。LD法所得PSD结果依据美国土壤质地分类制判定的土壤质地,相对于吸管法总体由粉黏质偏向粉砂质方向。建立了LD法与吸管法测定PSD结果的转换模型,将LD法测定的PSD结果利用转换模型校正后,其测定的各土壤粒级同吸管法相比,准确度达96.97%～98.71%,判定土壤质地的准确率也达83.15%。
Laser diffraction method(LD method) has been regarded as an effective method of measuring soil particle size distribution(PSD) in recent years.In order to compare PSD difference in measurements by LD method and pipette method in black soil region,178 soil samples collected from various layers of 36 soil profiles were analyzed by LD method and traditional pipette method.Results showed that,compared with pipette method,clay content by LD method was under-estimated by 19.69%,and silt and sand contents were ove...
出处
《水土保持通报》
CSCD
北大核心
2009年第2期134-139,143,共7页
Bulletin of Soil and Water Conservation
基金
国家重点基础研究发展计划项目“不同类型区土壤侵蚀过程及其机理”(2007CB407201)
中国科学院西部行动计划(二期)项目“水文过程响应及其模拟”(KZCX2-XB2-05-03)
西北农林科技大学创新团队计划项目“土壤侵蚀及其治理环境效应评价”(01140202)
关键词
激光衍射法
吸管法
颗粒粒径分布
转换模型
东北黑土区
laser diffraction method
pipette method
particle size distribution
transform model
black soil area of Northeast China
