QU Dongxu,LYU Gang,ZHAI Jingxuan,et al.Effects of Root System of Different Forest and Grass Measures on Soil Anti-Scouring in Southern Margin of Horqin Sandy Land[J].Research of Soil and Water Conservation,2020,27(01):21-25.
科尔沁沙地南缘不同林草措施根系对土壤抗冲性的影响
- Title:
- Effects of Root System of Different Forest and Grass Measures on Soil Anti-Scouring in Southern Margin of Horqin Sandy Land
- 文章编号:
- 1005-3409(2020)01-0021-05
- Keywords:
- Northwest Liaoning windy and sandy land; soil erosion resistance; plant roots; scouring of undisturbed soil
- 分类号:
- S157.2
- 文献标志码:
- A
- 摘要:
- 为了探明沙地植被根系对土壤抗冲性的影响机理,以科尔沁沙地南缘不同林草措施为研究对象,采用野外采样和原状土冲刷相结合的方法,分析了不同林草措施根系分布特征及其对土壤抗冲性的影响。结果表明:风沙地不同林草措施下以<0.5 mm的根系最多(占根长密度83.52%),根系总根长密度表现为杨树林地(12.09 cm/cm3)>樟子松林地(8.02 cm/cm3)>灌木林地(7.03 cm/cm3)>荒草地(4.48 cm/cm3)>花生地(3.89 cm/cm3),不同径级根系在土壤中的分布存在较大的空间变异性。根系重密度大小表现为杨树林地、樟子松林地、花生地、灌木林地、荒草地,根生物量与根系总根长密度大小表现为同样趋势; 土壤抗冲性强化值表现为樟子松林地(0.786 4 L·min/g)>杨树林地(0.758 4 L·min/g)>灌木林地(0.458 4 L·min/g)>荒草地(0.296 4 L·min/g)>花生地(0.064 L·min/g),土壤抗冲性能强化百分率大小为樟子松林地、杨树林地、灌木林地、荒草地、花生地; 土壤抗冲性强化值与根系径级<0.5 mm,0.5～1 mm,1～3 mm的根系长度呈显著线性正相关,与根系径级>3 mm的根系长度呈显著线性负相关。1～3 mm根系是影响土壤抗冲性的主要因素。根系径级3 mm是根系长度对土壤抗冲性强化影响的阈值。林地的抗冲性增强效果最好,建议推广使用。
- Abstract:
- In order to prove the mechanism of the influence of vegetation root system on soil anti-scouribility in sandy land, different forest and grass measures in southern margin of Horqin sandy land were taken as the research samples, and the root distribution characteristics of different forest and grass measures and their effects on soil anti-scouribility were analyzed by combining field sampling with soil erosion test. The results showed that under different forest and grass measures in sandy land, the root length and density of<0.5 mm were the most, and the total root length and density decreased in the order: Populus L.>Pinus sylvestris var>shurb land>unused grassland>Arachis hypogaea Linn, besides, the distribution of root system in different diameter classes had greater spatial variability in soil, root density decreased in the order: Populus L.>Pinus sylvestris>Arachis hypogaea Linn.>shurb land>bare sand, root biomass showed the same trend as the root density; reinforcement value of soil anti-scouribility decreased in the order: Pinus sylvestris>Populus L.>shurb land>bare sand>Arachis hypogaea Linn., percentages of soil anti-scouribility enhancement decreased in the order: Pinus sylvestris>Populus L.>shurb land>bare sand>Arachis hypogaea Linn; the soil anti-scouribility reinforcement value was positively correlated with lengths of roots with diameters of <0.5 mm, 0.5～1 mm and 1～3 mm, and negatively correlated with length of root with diameter of >3 mm. root system with 1～3 mm in diameter is the main factor affecting soil anti-scouribility. The root with 3 mm in diameter is the threshold of the effect of root length on soil anti-scouribility reinforcement. Effect of forestland on reinforcement of soil anti-scouribility was significant. Therefore, it is suggested that the forestland should be increased.
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备注/Memo
收稿日期:2019-01-30 修回日期:2019-03-17
资助项目:国家自然科学基金”辽河上游河岸缓冲带对农业非点源污染的阻控作用研究”(41501548)
第一作者:屈东旭(1989—),男,辽宁阜新人,硕士研究生,研究方向为水土保持与生态修复.E-mail:328235525@qq.com
通信作者:吕刚(1979—),男,吉林九台人,博士,副教授,主要从事水土保持与生态修复的教学和科研工作.E-mail:lvgang2637@126.com