LI Hui-ke,WANG Zhong-lin,HE Xiu-xian.Root Systems Distribution of Prickly Ash in Terrace Edge and Determination of Their Strength of Force[J].Research of Soil and Water Conservation,2000,7(01):38-41.
地埂花椒林根系分布及力学强度测定
- Title:
- Root Systems Distribution of Prickly Ash in Terrace Edge and Determination of Their Strength of Force
- 分类号:
- S157.1;S573.9
- 摘要:
- 地埂花椒林根系水平分布呈现出阶梯型分布，其中20～150 cm为集中分布区，占总根重的70%，150～210 cm为次集中分布区，占总根重的22.72%，210～250 cm为根系的少量分布区，占总根重的7.2 8%，根系的垂直分布呈现“V”字型分布，其中0～60 cm为根系集中分布区，在该土层中，0～20 cm土层根系分布最多，密度最大。在0～60 cm土层中，<1 mm根集中分布于0～20 cm土层中，占总根长的56.73%，且随深度的增加，其数量大幅度减少，1～3 mm根随深度的增加趋于减少，
- Abstract:
- The horizontal distributions of prickly ash in terrace edge roots is the ladder pattern distribution,of which 20～150 cm range is concentrating distribution areas,accounting for 70% of total root-mass,150～210 cm,secondary concentrating distribution areas,accounting for 22.72% of total root-mass,and there are few root systems in 210～250 cm range,accounting for 7.28% of total root-mass.The vertical distribution of root system shows "V"pattern distribution.Of which root system concentrates in 0～60 cm soil layer in which root system distribution greatest and has greatest density in 0～20 cm soil layer.In 0～60 cm soil layer,< 1 mm roots concentrate in 0～20 cm soil layer and decrease sharply with depth increasing,1～3 mm roots tend to decrease slightly with depth increasing,> 3 mm roots increase with depth increasing.Prickly ash in terrace edge root system becomes stout obviously with age of trees and total amount of root system increases.The tensile of root system with diameter of root shows linear function.In total systems,>3 mm roots are the body of resistant tensile,accounting for 59.35% of total tensile,second is < 1 mm roots,accounting for 23.63% of total tensile,the last is 1～3 mm roots,accounting for 17.12% of total tensile.But shearing strength of < 1 mm roots is greatest,accounting for 72.27% of total shearing strength,second is > 3 mm roots,accounting for 19.09% of shearing strength,the last is 1～3 mm roots,accounting for 8.54% of total shearing strength.
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备注/Memo
收稿日期:2000-1-1
基金项目:国家“九五”重点科技攻关计划项目，编号为96-004-05-07