晋西黄土区不同林地土壤团聚体分形维数特征与土壤养分相关关系  

Correlations of soil nutrients and fractal dimension features of soil aggregates in different forestland in loess region of western Shanxi Province,northern China

作　　者：丁杨[1] 张建军[1] 茹豪[1] 王丹丹[1] 李玉婷[1] 李志龙 

机构地区：[1]北京林业大学水土保持学院 [2]山西省吉县林业局良种繁育圃

出　　处：《北京林业大学学报》2014年第4期42-46,共5页Journal of Beijing Forestry University

基　　金：林业公益性行业科研专项(201304308)

摘　　要：以山西吉县退耕还林工程中的刺槐林地、油松林地、山茱萸林地、次生林地为研究对象，以撂荒地、农地为对照，采用Microtrace S3500激光粒度仪对各地类0～10cm、10～20cm、20～30cm土层的团聚体粒径进行测定和分级，利用分形几何学方法对土壤团聚体的分形特征进行分析，并测定了各地类土壤有机质、全N、全K的含量，以探讨土壤团聚体分形维数与土壤养分的关系。结果表明：各地类土壤团聚体分形维数在2．22～2．60之间，平均值为2．44；油松林地和刺槐林地土壤团聚体分形维数随土层深度增加有递增趋势，农地和次生林地土壤团聚体分形维数随土层深度的变化不明显，而山茱萸林地土壤团聚体分形维数随土层深度的增加有递减趋势；土壤团聚体分形维数与10～50μm的团聚体体积分数呈极显著正相关关系，与土壤团聚体粒径呈负相关关系；撂荒地土壤中有机质、全P、全K含量较低，肥力和质地最差，山茱萸林地土壤肥力和质地状态最佳，表明退耕林对土壤的改良效果显著。In this study, taking locust forest, Pinus tabuliformis forest, Cornus officinalis forest and secondary forest as research objects, which were planted in the returning farmland to forestland, and taking the abandoned land, farmland as control group, all the classes from 0 -10 cm, 10 -20 cm, 20 -30 cm of soil aggregate size were measured and classified by using Microtrace S3500 laser particle size analyzer, the fractal features of soil aggregate were analyzed by using the fractal geometry method. And the content of total N, total K in soil from different forest was determined to explore the relationship between fractal dimension of soil aggregates and soil nutrient so as to provide theoretical basis for returning farmland ecological benefit evaluation, and it will provide application values. The results showed that the soil aggregate fractal dimensions varied from 2.22 to 2.60, the average number was 2.44; soil aggregate fractal dimension of P. tabuliformis forest and R. pseudoacacia forest increased with soil depth increased, but agricultural land and secondary forest soil aggregate fractal dimension didn＇ t change significantly, and the D value of soil aggregate fractal dimension of C. officinalis forest decreased with soil depth increasing; there were significantly positive correlations between aggregate volume fraction of 10 -50 μm and the fractal dimension of soil aggregates, soil aggregate size showed a negative correlation with theformer; there was a lower content of organic matter, total P, total K in abandoned land soil, which was poor by fertility and texture, but the soil fertility and texture condition was completely opposite in C. officinalis forest, it showed significant improvement effect to return farmland to forestland.

关 键 词：土壤团聚体 土壤养分 土壤改良 退耕还林 黄土区 

分 类 号：S714.5[农业科学—林学]