摘要
用玉米作为实验材料进行分根实验。种子根平分在装有土娄土的分隔的白铁皮桶中。土壤容重分 4种处理 :低容重 (两边容重都为 1 .2 0 g· cm-3 )、中容重 (两边容重都为1 .33g· cm-3 )、高容重 (两边容重都为 1 .45g· cm-3 )和混合容重 (一边为 1 .2 0 g· cm-3 ,另一边为 1 .45g· cm-3 )。土壤水分控制在高基质势 (- 0 .1 7MPa)和低基质势 (- 0 .86MPa) 2个水平。结果表明 :当植株生长在高紧实土壤或土壤基质势从 - 0 .1 7MPa降到 - 0 .86 MPa时 ,根长和根干重都显著降低 ;紧实土壤使根长降低的同时还使根的直径增大。然而 ,当植株生长在混合容重土壤中时 ,处在低容重土壤中的根系生长得到加强 。
Split root experiments were conducted on maize under both low (-0.86 MPa) and high (-0.17 MPa) soil matric potential conditions,in which seminal roots were divided equally between two compartments in partitioned galvanized steel containers containing Lou soil.Four types of soil treatments were imposed:low density (both compartments packed to 1.20 g·cm -3 ),middle density (both compartments packed to 1.33 g·cm -3 ),high density (both compartments packed to 1.45 g·cm -3 ),and mix density (one compartment packed to 1.20 g·cm -3 ,the other to 1.45 g·cm -3 ).The results showed that high soil bulk density and low matric potential effects on root growth was independently significant,but low matric potential effects was more profound,and there was also an interactive negative effect of them upon the growth.There was a significant decrease in root length and also in root dry matter when plants are grown on compacted soils or the soil matric potential reach -0.86 MPa from -0.17 MPa.In high bulk density soils,not only was there a reduction of root length but there was increase in the diameter of roots.In contrast,when plants were grown in soil of mixed bulk density,there was enhanced growth of root in low density soil to compensate or even overcompensate for reduced growth in high density soil.
出处
《西北植物学报》
CAS
CSCD
2002年第4期831-838,共8页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家重点基础研究发展规划项目资助课题 ( G19990 1170 8)
关键词
土壤水分条件
土壤容重
玉米
根系生长
soil water content
soil bulk density
Zea mays L.
root system
effect
