摘要
地埂花椒林根系水平分布呈现出阶梯型分布 ,其中 2 0～ 15 0 cm为集中分布区 ,占总根重的 70 % ,15 0～ 2 10cm为次集中分布区 ,占总根重的 2 2 .72 % ,2 10～ 2 5 0 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～ 6 0 cm为根系集中分布区 ,在该土层中 ,0～ 2 0 cm土层根系分布最多 ,密度最大。在 0～6 0 cm土层中 ,<1m m根集中分布于 0～ 2 0 cm土层中 ,占总根长的 5 6 .73% ,且随深度的增加 ,其数量大幅度减少 ,1～ 3mm根随深度的增加趋于减少 ,但减少幅度较小 ,>3mm根随深度的增加而增加。地埂花椒林根系随树龄的增加 ,根系增粗明显 ,根系总量增加。根系拉力与根径呈线性相关 ,在整个根系中 ,>3mm根是抗拉力的主体 ,占总拉力的 5 9.35 % ,其次是 <1m m根 ,占总拉力的 2 3.6 3% ,1～ 3m m根最小 ,占总拉力的 17.12 %。抗剪强度 ,<1mm根最大 ,占总抗剪强度的 72 .37% ,其次是 >3m m根 ,占总抗剪强度的 19.0 9% ,1～ 3mm根最小 ,占总抗剪强度的 8.5 4%。
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.
出处
《水土保持研究》
CSCD
2000年第1期38-41,共4页
Research of Soil and Water Conservation
基金
国家"九五"重点科技攻关计划项目!编号为96-00 4-05-07
关键词
地埂花椒林
根系分布
力学强度
测定
prickly ash in terrace edge root system distribution strength of force
