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生态学杂志 ›› 2020, Vol. 39 ›› Issue (11): 3558-3566.doi: 10.13292/j.1000-4890.202011.012

• 研究报告 • 上一篇    下一篇

四川夹金山灌丛群落根系特征对土壤抗冲性的影响

张荣1,董洪君1,周润惠1,余飞燕1,王敏1,陈聪琳1,喻静1,郝建锋1,2*   

  1. 1四川农业大学林学院, 成都 611130; 2水土保持与荒漠化防治重点实验室, 成都 611130)
  • 出版日期:2020-11-11 发布日期:2021-05-10

Effects of root characteristics of shrub community on soil anti-scourability in the Jiajin Mountains, Sichuan Province.

ZHANG Rong1, DONG Hong-jun1, ZHOU Run-hui1, YU Fei-yan1, WANG Min1, CHEN Cong-lin1, YU Jing1, HAO Jian-feng1,2*   

  1. (1College of Forestry, Sichuan Agricultural University, Chengdu 611130, China; 2Soil and Water Conservation, Desertification Combating of MOE, Sichuan Provincial Colleges and Universities Key Laboratory, Chengdu 611130, China).
  • Online:2020-11-11 Published:2021-05-10

摘要: 为探明高山峡谷区灌丛群落根系对土壤抗冲性的影响,以四川夹金山高山灌丛植被为研究对象,采用Ward聚类分析方法划分群落类型,在此基础上,采用野外采样和原状土冲刷试验相结合的方法,分析夹金山不同类型群落根系属性特征及其对土壤抗冲性的影响。结果表明:(1)夹金山灌丛群落被划分为4个类型,根长密度和根表面积密度表现为高山栎(Quercus semicarpifolia)+皂柳(Salix wallichiana)野草莓(Fragaria vesca)群落(类型Ⅳ)>亮叶杜鹃(Rhododendron vernicosum)蹄叶橐吾(Ligularia fischeri)群落(类型Ⅰ)>硬叶杜鹃(Rhododendron tatsienense)+高山栒子(Cotoneaster subadpressus)蕨(Pteridium aquilinumvar. latiusculum)群落(类型Ⅱ)>高山栎+高山栒子蕨群落(类型Ⅲ);(2)每个类型的根系主要以<1 mm径级为主,Ⅳ群落根系分布最多;(3)在原状土冲刷试验过程中,各群落类型含沙量随时间延长先降低后趋于平缓,抗冲系数总体随冲刷时间的延长呈波动性增强的趋势,Ⅳ群落土壤抗冲性更强;(4)相关性分析表明,根径0.5~1 mm的根系、总根重密度和总根体积是影响夹金山高山灌丛土壤抗冲系数的主要因素。研究结果为高山峡谷区灌丛群落的土壤侵蚀规律研究提供依据。

关键词: 土壤抗冲性, 灌丛群落, 根系, Ward聚类, 高山峡谷区

Abstract: We examined the impacts of shrub community roots on soil antiscourability in alpine gorge area in Jiajin Mountains of Sichuan Province. The Ward cluster analysis method was employed to divide communities into different types. Field sampling and undisturbed soil erosion experiment were conducted to analyze the root distribution characteristics of different community types and their effects on soil erosion resistance. The results showed that shrub communities in Jiajin Mountains could be divided into four types, with root length density and root surface area density following the order ofQuercus semicarpifolia+Salix wallichianaFragaria vesca community (type Ⅳ) > Rhododendron vernicosumLigularia fischeri community (type Ⅰ) >R. tatsienense+Cotoneaster subadpressusPteridium aquilinumvar. latiusculumcommunity (type Ⅱ) >Q. semicarpifolia+C. subadpressusP. aquilinumvar. latiusculum community (type Ⅲ); (2) Each community was dominated by roots of <1 mm diameter, while community type Ⅳ had the highest root biomass; (3) Results of the undisturbed soil erosion test showed that soil sand content in each community type decreased over time and then tended to be gentle, while the soil antiscourability coefficient was fluctuatingly increased with erosion time. The soil of type Ⅳ had stronger antiscourability; (4) Results of correlation analysis showed that roots of 0.5-1 mm diameter, total root weight density and total root volume were the main factors influencing soil anti-scourability of shrubs in Jiajin Mountains. Our results provide a basis for studies of soil erosion pattern of shrub community in the alpine gorge area.

Key words: soil anti-scourability, shrub community, root system, Ward clustering, alpine gorge.