LIU Ting-ting,GAO Zhong-chao,KUANG En-jun,et al.Study on Physical Characteristics of PlanosolIII.Microstructure and Porosity Features[J].HEILONGJIANG AGRICULTURAL SCIENCES,2012,(06):45-48.
白浆土某些物理性质的研究III.白浆土微结构及孔隙特征
- Title:
- Study on Physical Characteristics of PlanosolIII.Microstructure and Porosity Features
- 文章编号:
- 1002-2767（2012）06-0045-04
- Keywords:
- planosol; soil water; anti-shear strength; brittleness; clod distribution
- 分类号:
- S155.2+6
- 文献标志码:
- A
- 摘要:
- 为探究白浆土的某些物理性质，对自然林下的白浆土和耕地白浆土的土壤微结构进行对比分析。结果表明：自然林下荒地白浆土剖面未受到过任何人为扰动，表层土壤中有大量的植物根系和土壤动物的残留物质，土壤团粒结构发达，孔隙量大，土质疏松；表土层向白浆层呈渐进式过渡；而耕地白浆土的表层土壤，由于受机械耕作影响，土层内混有大量白浆层土壤,土壤紧实，孔隙量减少。白浆层土壤结构呈厚度为2～3 mm片状结构，仅有少量水平方向发展的孔隙，无利于土壤排水的纵向孔隙，无作物根系；淀积层土壤呈小核状结构，干缩后沿结构形成裂隙。白浆土的土壤总有效储水孔隙（0.050 0～0.000 2 mm）为耕层的16.9%～20.3%。白浆层仅为耕层的67.4%～83.3%，淀积层为耕层的25.6%～54.4%。直径>0.05 mm的重力水孔隙耕层在17.8%～24.4%，白浆层和淀积层土壤的重力水孔隙仅1.3%~1.8%和2.4%～6.4%，表明土壤通透性差。直径＜0.000 2 mm的无效孔隙，淀积层明显高于耕层和白浆层，土壤持水能力强。
- Abstract:
- In order to explore physical characteristics of planosol,through comparing microstructure of albic soil and topsoil under natural forest area,it found that there were a large number of residues of plant root and soil fauna,soil aggregate structure was abundant,porosity was bigger and soil was loose.Because of mechanical effects of tillage,topsoil mixed with a large number of albic soil and soil porosity reduced.The structure thickness of albic soil layer was 2～3 mm sheet,only a small amount of soil porosity ranked along horizontal direction,it was not benefit to soil drainage,there was not crops root.The soil structure of illuvial horizon was nuciform,it formed crack along its structure when it shrunk.About albic soil porosity（0.050 0～0.000 2 mm）of soil water holding capacity,topsoil was 16.9%～20.3%,albic soil layer was account for 67.4%～83.3% of topsoil,illuvial horizon was account for 25.6%～54.4% of topsoil.Gravitational water porosity of topsoil was 17.8%～24.4%,gravitational water porosity of albic soil layer and illuvial horizon were only in 1.3%～1.8% and 2.4%～6.4%,it showed that soil permeability was weak.The ineffective porosity of the soil water holding capacity of illuvial horizon was higher clearly than that of topsoil and albic soil layer.
参考文献/References:
[1]中国科学院南京土壤研究所.中国土壤[M].北京：科学出版社，1978. [2]姚贤良.土壤物理学[M].北京：农业出版社，1986.
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备注/Memo
第一作者简介： 刘婷婷（1983-），女，黑龙江省哈尔滨市人，学士，研究实习员,从事土壤改良研究。E-mail:ttl83123 @ 163.com。