豫西黄土丘陵区不同退耕地土壤大团聚体的组成及其分形特征  

Composition and fractal features of soil macro-aggregate under different abandoned lands in the loess hilly region of West Henan

作　　者：刘晶[1] 王磊[1] 

机构地区：[1]河南科技大学林学院,河南洛阳471003

出　　处：《广东农业科学》2015年第19期48-54,共7页Guangdong Agricultural Sciences

基　　金：河南科技大学博士科研基金(09100687)

摘　　要：选取退耕10年左右的乔木林、灌木林、果园、人工草地及荒地,对表层土壤大团聚体的分布、稳定性及其分形特征进行研究。结果表明,〉2 mm的团聚体在土壤团粒结构中占主导地位,灌木地、乔木地和荒地土壤中2~5 mm和1~2 mm团聚体含量较耕地显著提高;灌木地、乔木地、果园、草地和荒地表层土壤中〉5mm和2~5 mm两个粒级水稳性团聚体含量较耕地均显著提高。灌木林、乔木林、草地和荒地土壤中干筛和湿筛团聚体的平均重量直径和几何平均直径较耕地均显著增加,分维数较耕地显著降低,这4种退耕地土壤结构显著改善,果园土壤结构的改善尚不明显。团聚体分维数能较好地描述土壤团聚体的分布状况且与土壤理化性质关系密切。The distribution, stability and fractal features of topsoil macro-aggregate were studied for abandoned arbor, shrub, orchard, grassland and wasteland about 10 years. The results showed that： 〉2 mm aggregate dominated in the soil aggregate structure, the 2-5 mm and 1-2 mm aggregate contents in shrub, arbor land and wasteland soil increased significantly than those of the cultivated land; the contents of 〉5ram and 2-5 mm water stable aggregate in the arbor, shrub, orchard, grassland and wasteland in the topsoil significantly increased than those of cultivated land. The mean weight diameter and geometrical mean diameter by dry sieving and wet sieving in the arbor, shrub, grassland and wasteland significantly increased, but the fractal dimension decreased significantly than that of cultivated land, this 4 kinds of soil structurs were improved significantly, but the orchard soil structure improvement was not obvious. The soil aggregate fractal dimension can describe the distribution of soil aggregate better and has close ~lationship with soil physiochemical properties.

关 键 词：黄土丘陵 退耕 大团聚体 组成 分维数 

分 类 号：S153.6[农业科学—土壤学]