文章摘要
黄娟, 邓羽松, 马占龙, 黄智刚, 杨钙仁, 蒋代华.桂东南花岗岩丘陵区不同土地利用方式土壤大孔隙特征[J].水土保持学报,2021,35(2):80~86,95
桂东南花岗岩丘陵区不同土地利用方式土壤大孔隙特征
Characteristics of Soil Macropores in Granite Hilly Region Area with Different Land Use Types in Southeast Guangxi
投稿时间:2020-09-03  
DOI:10.13870/j.cnki.stbcxb.2021.02.012
中文关键词: 土地利用  土壤大孔隙  水分穿透曲线  Poiseuille方程
英文关键词: land use  soil macropore  water breakthrough curve  Poiseuille equation
基金项目:广西科技基地和人才专项(桂科AD20159031);国家自然科学基金重点项目(41630858)
作者单位E-mail
黄娟1, 邓羽松1, 马占龙1, 黄智刚2, 杨钙仁1, 蒋代华2 1. 广西大学林学院, 南宁 530004

2. 广西大学农学院
, 南宁 530004 
denny2018@gxu.edu.cn 
摘要点击次数: 22
全文下载次数: 24
中文摘要:
      根据水分穿透曲线和Poiseuille方程,定量研究桂东南花岗岩区6种(次生林、柑橘园、玉米地、杉木林、撂荒地和桉树林)不同土地利用方式土壤大孔隙半径范围、数量及分布情况,分析不同土地利用方式对土壤大孔隙特征的影响。结果表明:(1)不同土地利用方式土壤水分穿透速率存在差异,土壤水分出流速率短时间内可达到稳定状态,柑橘园不同土层之间稳定出流速率变化较大;(2)不同土地利用方式的土壤大孔隙半径为0.4~2.4 mm,主要集中分布在0.4~1.2 mm,均值为0.85 mm,<1.2 mm的小半径孔隙数量较多;(3)随着土层深度的增加和孔隙半径的减小,土壤大孔隙数量总体表现为随土层深度的增加而逐渐减少,大半径孔隙较少,小半径孔隙较多;(4)不同土地利用方式的土壤大孔隙仅占土壤体积的0.36%~6.38%,但其土壤大孔隙平均体积与稳定出流速率、土壤大孔隙平均半径与饱和导水率均呈极显著相关关系,分别决定了稳定出流速率79.92%和饱和导水率36.45%的变异。
英文摘要:
      According to the water breakthrough curve and Poisssulle equation, the radius range, quantity and distribution of soil macropores covered by different land use types (secondary forest, citrus orchard, corn land, cedar forest, uncultivated land and eucalyptus forest) were quantitatively studied in granite area in southeast Guangxi. The results showed that:(1) There were differences in soil moisture breakthrough rates among different land use types. Soil water out flow rate reached a stable state in a short time, and only the stable outflow rate of citrus orchard changed greatly. (2) The soil macropore radius of different land use types was 0.4~2.4 mm, mainly distributed between 0.4~1.2 mm, the mean value was 0.85 mm, and there were a lot of small radius voidage <1.2 mm. (3) With the increase of soil depth and the decrease of pore radius, the number of soil macropores generally decreased, with fewer pores with large radius and more pores with small radius. (4) Under different land use types, soil macropores only accounted for 0.36%~6.38% of the soil volume, but their average volume of soil macropores was significantly correlated with stable outflow rate, average radius of soil macropores and saturated water conductivity, which determined the variations of stable outflow rate and saturated water conductivity by 79.92% and 36.45% respectively.
查看全文   查看/发表评论  下载PDF阅读器
关闭