摘要
黄土塬边坡植被建设以固坡为目的,不同植被的土壤孔隙结构有利于增加降水入渗,从而减少坡面产流的水蚀危害。本研究以长武塬黄土塬边坡的侧柏(Platycladus orientalis)林地、沙棘(Hippophae rhamnoides)灌丛、草地和农地4种植被为研究对象,采集0–30 cm的原状土柱,利用CT扫描和图像处理技术,对其土壤孔隙度、孔隙数目、孔隙成圆率和孔隙分形维数进行定量分析,结合土层样品的理化性质,研究影响土壤孔隙结构的主要因素。结果表明,农地、侧柏孔隙的孔径大小分异不大,而草地、沙棘自身根系互动穿插生成的根孔扩展了孔径分布范围,不仅增加了孔隙度和大孔隙数目,也降低了孔隙成圆率。草地、沙棘有利于降水入渗,是固坡的优先选择。土壤有机质、粘粒含量等性质与孔隙参数之间具有极显著(P<0.001)或显著(P<0.05)相关关系,它们的改变对土壤孔隙特征变化和提高蓄水保土能力具有重要影响。
Vegetation was planted on the Loess Tableland slope with the aim of solidifying the slope.The soil pore structure under the influence of vegetation can help increase rainfall infiltration and reduce water erosion hazards caused by slope runoff.In this project,four types of vegetation located on the Changwu Loess tableland slope were chosen as research objects.Undisturbed soil columns were collected from the 0–30 cm soil layer.Quantitative analysis of soil porosity,pore number,pore rounding rate,and pore fractal dimension was carried out using computerized tomography scanning and imageprocessing techniques.The main factors affecting the structure of the soil pores were analyzed in combination with the physicochemical properties of the soil layer samples.The results showed that pore size did not differ significantly between cropland and Platycladus orientalis vegetation types.Grassland and Hippophae rhamnoides roots increased porosity and pore number and reduced pore-rounding rates.Grassland and Hippophae rhamnoides vegetation types are therefore favorable for rainfall infiltration,making these the preferred choices for creating solid slopes.There was a significant(P<0.001)or(P<0.05)correlation among soil organic matter and clay content and pore parameters,and changes in these parameters had an important effect on soil pore characteristics.
作者
冯璐
丁康
屈媛媛
Farhat Ullah KHAN
杜峰
徐学选
FENG Lu;DING Kang;QU Yuanyuan;Farhat Ullah KHAN;DU Feng;XU Xuexuan(College of Grassland Agriculture,Northwest A&F University,Yangling 712100,Shaanxi,China;Institute of Soil and Water Conservation,Northwest A&F University,Yangling 712100,Shaanxi,China;Institute of Soil and Water Conservation,CAS&MWR,Yangling 712100,Shaanxi,China)
出处
《草业科学》
CAS
CSCD
2020年第4期625-634,共10页
Pratacultural Science
基金
国家十三五研发专项“黄土高原生态修复模式的格局–结构–功能关系”(2016YFC0501602)
国家自然科学基金项目“黄土丘陵区土壤斥水性及其对降水入渗机制的影响研究”(41977426)。
关键词
黄土塬边坡
植被类型
CT扫描
土壤孔隙
性质参数
loess tableland slope
vegetation types
CT scanning
soil pores
property parameters
