黄土高原半干旱区不同土地利用方式下土壤结构特征  

Characteristics of soil structure under different land use types in semi-arid region of Loess Plateau

作　　者：陈婧[1] 王誉陶 张娟[1] 李建平[1,2] Chen Jing;Wang Yutao;Zhang Juan;Li Jianping(School of Agriculture,Ningxia University,Yinchuan ,Ningxia,750021,China;Breeding Base of State Key Laboratory for Preventing Land Degradation and Ecological Restoration,Ningxia University,Yinchuan ,Ningxia,750021,China)

机构地区：[1]宁夏大学农学院,宁夏银川750021 [2]西北退化生态系统恢复与重建国家重点实验室培育基地,宁夏银川750021

出　　处：《农业科学研究》2019年第3期27-31,共5页Journal of Agricultural Sciences

基　　金：国家自然科学基金(31660143)资助;宁夏高等学校一流学科(草学)项目(NXYLXK2017A01)

摘　　要：土壤团粒组成是土壤稳定性重要因素,不同土地利用方式对于土壤结构产生重要影响.本文以宁夏固原封育15年的草地和柠条地为研究对象,利用干筛法对0~100 cm土层中土壤团粒组成进行了研究.结果表明:①封育草地相对于柠条地,显著提高了<0.25 mm土壤粒级质量分数,而10~7 mm土壤粒级质量分数显著降低.②封育草地表层土壤MWD与GMD值显著高于柠条地,草地表层土壤稳定性较好.③封育草地土壤分型维数D小于柠条地,封育草地显著降低土壤分散度,随着土层深度的增加土壤分散度相对降低.④封育草地R0.25值低于柠条地,封育草地肥力水平低于柠条地.因此,在黄土高原半干旱区退化天然草地恢复过程中,草地封育可提高土壤稳定性及抗侵蚀性,人工柠条种植可在短期内提高土壤R0.25值.Soil aggregate composition is an important factor in soil stability, land use effects on soil on soil aggregate composition dramatically. This study wants to determine the soil aggregate composition of 0-100 cm soil layer by dry sieving method in fencing15 years grassland(FG) and Caragana korshinskii land(CKL) in Guyuan city of Ningxia, China. The results showed that:① compared with CKL land, FG increased the soil particle size of < 0.25 mm significantly, while the soil particle size of 10-7 mm decreased significantly(p<0.05).②in the top soil layer, the MWD and GMD values of FG were significantly higher than that of CKL,and the stability of the surface soil of FG was better.③ the soil fractal dimension(D)of FG was smaller than that of CKL, and the FC decreased the D value of soil. With the increase of soil depth, D value of soil became smaller and smaller;④ The R0.25 value of FG was lower than that of CKL, and the fertility status of FG was lower than that of CKL probably. Therefore, in the process of restoration of degraded natural grassland in semi-arid region of the Loess Plateau, fencing can improve soil stability and erosion resistance, and planting Caragana korshinskii can increase soil R0.25 value in a short time.

关 键 词：土地利用 封育 柠条 土壤团聚体 

分 类 号：S152.3[农业科学—土壤学]