期刊论文

Liu, M.X.

中文

生态学报

1000-0933

2016

36

11

3189-3196

10.5846/stxb201504280880

国家自然科学基金项目（41001125） 湖北省自然科学基金重点项目（2015CFA141）

本校为第一机构

土壤大孔隙是土体内孔径较大能优先传导水分的根孔、洞穴或裂隙,大孔隙内优先流的产生是土壤水分运动研究由均衡走向非均衡的标志。利用原状土柱的水分穿透试验,对三峡库区山地不同林型覆盖下土壤的大孔隙结构进行了研究,分析了温性阔叶林棕壤、针阔混交林黄棕壤、暖性针叶林黄壤及弃耕草地剖面内大孔隙的剖面分布特征及其对土壤饱和导水率的影响。结果表明:研究区内森林土壤的大孔隙当量孔径在0.3-3 mm之间,占土壤总体积的0.15%-4.72%。大孔隙中孔径0.3-0.6 mm的大孔隙密度最大,占大孔隙总数量的72.2%-90.4%;而孔径>1 mm的孔隙仅占大孔隙总数量的1.26%-8.55%。土壤大孔隙密度和大孔隙面积比的顺...

Soil macropores refer to pores with a larger diameter and higher hydraulic conductivity than those of the soil matrix; these macropores include root channels, caves, and fissures. The preferential flow of water to the soil macropores would result in non-uniform soil water transport, this indicates a need to study the mechanisms of soil water movement from homogeneous to heterogeneous fields. Water breakthrough experiments with undisturbed soil samples identified the structure of the macropores of four kinds of mountain soils covered by differen...