摘要
为揭示黄河三角洲贝壳堤典型灌草群落的土壤颗粒分形特征及其影响因素,以滩脊地带酸枣蒙古蒿、杠柳砂引草和蒙古蒿芦苇3种灌草群落为研究对象,并以裸地作为对照,采用激光衍射分析技术,测算不同灌草群落的土壤颗粒粒径分布、单重和多重分形特征。结果表明:灌草群落的贝壳砂呈现非均匀分布的特性,具有明显的异质性。贝壳砂单重分形维数D在1.411~2.490之间,数值从大到小依次为酸枣蒙古蒿、杠柳砂引草、蒙古蒿芦苇和裸地,同一灌草群落与裸地不同土层之间的贝壳砂单重分形维数差异显著(P<0.05),0~10 cm土层均小于10~20 cm。不同灌草群落不同土层之间容量维数D0、信息维数D1、关联维数D2、D1/D0、D0-D1差异显著(P<0.05)。容量维数D0与贝壳砂黏粒、粉粒、极细砂粒的体积分数呈显著正相关(P<0.05),可作为表征贝壳砂粒径分布的指示性参数。贝壳砂生境增加灌草群落的数量有利于提高贝壳砂细粒物质的含量,植被改良土壤粒径组成效果显著。
[Background]In order to reveal the fractal characteristics of soil grains and its influencing factors of typical shrub-grass communities in the Chenier of the Yellow River Delta,the three shrub-grass vegetation types of Ziziphus jujuba var.spinosa-Artemisia mongolica shrub-grass community,Periploca sepium Bunge-Messerschmidia sibirica shrub-grass community and A.mongolica-Phragmites australis herb community were taken as the research objects.[Methods]Based on the 3 typical shrub-grass communities with consistent habitat conditions,and used the bare land in the same section as a control,we selected 3 sample plots(10 m×10 m)for each shrub-grass community and bare land,and collected soil samples of 0-10 and 10-20 cm soil layers with 5-point method,and 5 samples of each type of shrub-grass community and bare land were mixed in layers and used as experimental samples.The different shrub-grass communities of soil particle size distribution,monofractal and multifractal characteristics were measured by laser diffraction analysis technique.Excel was used to obtain the fractal parameter(D,D0,D1,and D2)[Results]1)The shell sands of typical shrub-grass communities showed non-uniform distribution and obvious heterogeneity.The monofractal dimension(D)of shell sand ranged from 1.411 to 2.490.The values were in a descending order of Z.jujuba var.spinosa-A.mongolica shrub-grass community,P.sepium Bunge-M.sibirica shrub-grass community,bare land and A.mongolica-P.australis herb community.The content of fine particles in 10-20 cm soil layer in each type was 53.5%,53.6%,27.2%and 153%higher than that in 0-10 cm soil layer,respectively.2)There was a significant difference between different soil layers of the same shrub-grass community(P<0.05).The D value of 0-10 cm soil layer was less than that of 10-20 cm.There were significant differences in volumn dimension(D0),information entropy dimension(D1),correlation dimension(D2),D1/D0 and D0-D1 among different soil layers in different shrub-grass communities(P<0.05).3)Generally,the heterog
作者
任冉冉
夏江宝
张淑勇
陈印平
刘明新
REN Ranran;XIA Jiangbao;ZHANG Shuyong;CHEN Yinping;LIU Mingxin(Forestry College of Shandong Agricultural University, Mountain Tai Forest Ecosystem Research Station of State Forestry and Grassland Administration, 271018, Tai′an, Shandong, China;Shandong Key Laboratory of Eco-environmental Science for Yellow River Delta,Binzhou University, 256603, Binzhou, Shandong, China;Weifang Linqu County Agricultural Comprehensive Development Office, 262600, Weifang, Shandong, China)
出处
《中国水土保持科学》
CSCD
北大核心
2020年第3期48-58,共11页
Science of Soil and Water Conservation
基金
国家自然科学基金“黄河三角洲贝壳堤优势灌木土壤系统水分传输特征及其驱动机制”(31770761)
山东省农业科技资金(林业科技创新)项目“滨海盐碱地森林植被生态修复关键技术与示范”(2019LY006)
泰山学者工程(TSQN201909152)。
关键词
贝壳砂
单重分形
多重分形
灌草类型
黄河三角洲
shell sand
monofractal
multifractal
shrub-grass type
the Yellow River Delta
