青海省3种地带性土壤粒径分形特征  

Fractal characteristics of particle size in three zonal soils of Qinghai Province,China

作　　者：王鸿霞 宋明丹 塔林葛娃 李月梅[1,2] 王乾冰[1] 刘承琦[1] WANG Hongxia;SONG Mingdan;Talin Gewa;LI Yuemei;WANG Qianbing;LIU Chengqi(Qinghai University,Xining 810016,China;Academy of Agriculture and Forestry Sciences,Qinghai University,Xining 810016,China)

机构地区：[1]青海大学,西宁810016 [2]青海大学农林科学院,西宁810016

出　　处：《应用与环境生物学报》2024年第6期1108-1114,共7页Chinese Journal of Applied and Environmental Biology

基　　金：第二次青藏高原综合科学考察研究项目(2019QZKK0303);青海省重大科技专项(2023-NK-A3)资助。

摘　　要：以青海省海西州西北部和海南州南部不同地带性土壤为研究对象,运用分形理论研究该区域3种地带性土壤粒径分布及其分形维数的差异性,为土地资源合理利用提供参考.野外采样和室内分析相结合,利用激光衍射技术测定土壤样品的粒径分布,并通过经典统计学和分形理论分析研究区不同土壤其剖面粒径分形特征.结果表明:(1)3种地带性土壤栗钙土、棕钙土和灰棕漠土0-100 cm土壤颗粒组成均以粉粒(25%-75%)、砂粒(24%-73%)为主,黏粒(0.2%-0.9%)含量较低.其中栗钙土和棕钙土粉粒含量占比较高,其次是砂粒,而灰棕漠土与之相反,则表现为砂粒>粉粒;(2)3种地带性土壤质地由粗到细依次为灰棕漠土、棕钙土、栗钙土,灰棕漠土和棕钙土,随着土层深度增加粗质地(壤砂土和砂壤土)呈现先增加后降低的趋势,栗钙土土壤质地在各层中均为中等质地(粉壤土和粉土);(3)3种地带性土壤土壤颗粒分形维数(D)主要在2.18-2.42之间,分形维数大小为栗钙土>棕钙土>灰棕漠土.除个别土层土壤颗粒分形维数存在波动外,总体上,不同地带性土壤颗粒分形维数随土层增加呈增大趋势;随土壤质地由粗变细,土壤颗粒分形维数呈增加趋势.本研究表明3种地带性土壤粒径及分形维数差异明显,栗钙土土壤结构相对较好,具有较强的农业发展潜力,地处柴达木盆地的棕钙土和灰棕漠土的土壤结构较粗,因此在土地利用过程中应增加有机物料的投入,并配套合理的灌溉模式.Taking various zonal soils from the Northwest of the Haixi Prefecture and South of the Hainan Prefecture in Qinghai Province as research subjects,we examined variations in the particle size distribution and fractal dimension of the three zonal soil types.The particle size distribution of the soil samples was determined using laser diffraction,and the fractal characteristics of various soil types in the study area were analyzed using classical statistics and fractal theory.The findings revealed that the soil particles within the 0-100 cm depth of the three zonal soils were primarily composed of silt(25%-75%)and sand(24%-73%),whereas the clay content(0.2%-0.9%)was relatively low.Among them,the silt content was relatively high in chestnut soil and brown calcium soil,followed by sand.In contrast,the grayish-brown desert soil exhibited a higher proportion of sand than clay.The three zonal soil textures,from coarse to fine,were gray-brown desert soil,brown calcium soil,and chestnut soil.With increasing soil depth,coarse textures(loamy sand and sandy loam)initially increased and then decreased.The texture of the chestnut soil remained medium in each layer,consisting of silty loam and silt.The fractal dimensions(D)of the soil particles in the three zonal soils ranged primarily between 2.18 and 2.42,with the following order of fractal dimensions:chestnut soil>brown calcic soil>gray brown desert soil.In general,the fractal dimensions of the soil particles increased with soil layer depth across various zones,except for some fluctuations observed within individual soil layers.The fractal dimensions of the soil particles increased as the soil texture changed from coarse to fine.In conclusion,the variation in the particle size among the three zonal soils was significant.The soil structure of the chestnut soil was relatively good and had a strong potential for agricultural development.The soil structures of the brown calcium soil and gray-brown desert soil,located in the Qaidam Basin,were relatively coarse.Therefore,in the proc

关 键 词：青海 土壤质地 土壤颗粒分形维数 土壤粒径分布 

分 类 号：S152.3[农业科学—土壤学]