| 引用本文: | 石 辉,王 峰,李秧秧. 黄土丘陵区人工油松林地土壤大孔隙定量研究[J]. 中国生态农业学报(中英文), 2007, 15(1): 28-32 |
| SHI Hui,WANG Feng,LI Yang-Yang. Quantitative studies on soil macropores under artificial Chinese pine(Pinus tabuleaformis Carr.)forest in loess hilly region[J]. Chinese Journal of Eco-Agriculture, 2007, 15(1): 28-32 |
| DOI： | DOI:10.3724/SP.J.1011.year_id].028 |
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| 摘要: 根据水分穿透曲线和Poiseulle方程原理，定量研究
了黄土丘陵区人工油松林地原状土大孔隙的半径范围、个数及分布情况。黄土丘陵区人工油松林地田间持水量至饱和含水量之间的大孔隙半径为0.2～3mm,孔径＞1mm的特大孔隙仅占大孔隙总数的2.2%，表现出特大孔隙较少、小孔隙较多的特点。土壤剖面上部的大孔隙加权平均半径较大，随土层深度的增加，大孔隙半径逐渐减小。大孔隙所占过水断面面积在1.27%～18.13%之间，大部分样品大孔隙所占过水断面面积＜5%。坡位、坡度、坡形、坡向对大孔隙形成起着重要作用。大孔隙 |
| 关键词: 人工油松林地 土壤大孔隙 水分穿透曲线 饱和导
水率 |
| 中图分类号: |
| 基金项目:国家重点基础研究(973)发展规划项目(2002CB11502)、国家自然科学基金项目(40471078)和国家自然科学基金重点项目(30230290) |
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| Quantitative studies on soil macropores under artificial Chinese pine(Pinus tabuleaformis Carr.)forest in loess hilly region |
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SHI Hui1, WANG Feng2, LI Yang-Yang3
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1.Key Laboratory of Northwestern Water Resources and Environmental Ecology,Ministry of Education,College of Environmental and Munici
pal Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;2.School of Resources and Environments,Southwest China Normal University,Chongqing 400715,China;3.Institute of Soil and Water Conservation,Northwest Sci-Tech University of Agriculture and Forestry,Yangling 712100,China
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| Abstract: The radius,number and distribution of soil macropores under artificial Chinese pine(Pinus tabuleaformis Carr.)forest were quantitatively researched by the water breakthrough curve and Poiseulle equation.The radius of soil macropore,which is defined as the pores between field capacity and saturated water content,is 0.2～3 mm,of which the macropores with the radius larger than 1mm account for only 2.2% of total macropore number.And there are more macropres in the upper layers of soil profiles than those in the lower layers.The weighted mean radius of macropores in the upper layers is larger,and is gradually decreased along with the soil depth.The ratio between the macropore area and water through sectional area is 1.27%～18.13%,and the ratio is less than 5% for most samples.The slope position,gradient,shape and direction intensively affect soil macropores.Although soil macropores account for small portion of the soil volumes,there is a remarkable power function relation between the mean radius of soil macropores and water flux,saturated hydraulic conductivity.The mean radius determines 77% and 75% variances of water flux and saturated hydraulic onductivity,respectively.The mechanics of intensifying soil penetration by plants is the effect of preferential flow,which is produced by soil macropores formed by roots. |
| Keyword: Artificial Chinese pine forest,Soil macropore,Water breakthrough curve,Saturated hydraulic conductivity |
