网格式生物埂对坡面土壤颗粒分形特征的时间效应  

Time Effect of Net Form Banks on Slope Surface Soil in Fractal Features of Soil Particle Size Distribution

作　　者：姚云[1] 何丙辉[1] 李建兴[1] 李翠莲[2] 黄欢[1] 秦川[1] 

机构地区：[1]西南大学资源环境学院/三峡库区生态环境教育部重点实验室,重庆400715 [2]贵州大学林学院,贵阳550025

出　　处：《水土保持学报》2013年第2期238-243,249,共7页Journal of Soil and Water Conservation

基　　金：国家科技支撑计划项目(2011BAD31B03);国家自然科学基金项目(40971166);国家林业局公益性行业科研专项(201104043);重庆市重大科技专项(CSTC2009AB1115);西南大学生态学重点学科"211工程"三期建设项目

摘　　要：为研究网格式生物埂护坡的时间效应,以无生物埂护坡的裸坡为对照,运用分形学原理,对实施年限为1～4年的黄花生物埂坡面土壤机械组成及微团聚体分形维数特征进行研究,并将两者的分形维数与土壤理化性质之间的关系进行拟合。结果表明:(1)各实施年限土壤机械组成分形维数介于2.634～2.786之间,且表现为T4>T3>T2>T1>CK,与<0.05mm粒级颗粒含量呈显著的线性关系;(2)各实施年限土壤微团聚体分形维数介于2.486～2.602之间,且表现为CK>T1>T2>T3>T4,与<0.01mm粒级颗粒含量呈显著的线性关系;(3)坡位对土壤机械组成及微团聚体分形维数的影响明显,1～4年的黄花生物埂土壤机械组成分形维数值表现为坡上>坡中>坡下,微团聚体分形维数值表现为坡上<坡中<坡下,而作为对照的裸坡分别表现出与之相反的规律;(4)土壤机械组成、微团聚体分形维数与土壤基本理化性质均极显著相关。To study the time effect of net form banks on slope protection, based on the fractal theory, taking non-banks bare slop as a control, the fraetal features of soil mechanical composition and micro-aggregates of Hemerocallis fulva banks were studied with one-year development period to four-year development period, and the relationship between fractal dimension and soil physical-chemical properties were investigated in slopes. The results indicated that： （1）The fraetal dimension of soil mechanical composition in different development time was ranged from 2. 634 to 2. 786, and shown as the sequence of T4〉T3〉T2〉T1 CK, and it was significantly related with the content of soil mechanical composition 〈0.05 mm size class. （2）The fractal dimension of soil micro-aggregates in different development period was ranged from 2. 486 to 2. 602, and shown as the sequence of CK〉T1 〉T2 〉T3 〉T4, and it was significantly related with the content of soil mechanical composition d0.01 mm size class. （3）The influence of slope position on the fractal dimension of soil mechanical composition and micro-aggregates had obvious regularity, there was the regularity of up slope 〉middle slope 〉down slope in one-year development period to four-year development period on the fraetal dimension of soil mechanical composition and the fraetal of micro-aggregates showed up slope 〉middle slope 〉down slope, however, the bare slope respectively exhibited contrary tendency. （4）The fraetal dimension of soil meehanieal composition and micro-aggregates was significantly correlated with soil physical and chemical properties.

关 键 词：丘陵山区 网格式生物埂 土壤机械组成 微团聚体 分形特征 

分 类 号：S152.3[农业科学—土壤学]