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草业学报 ›› 2023, Vol. 32 ›› Issue (11): 40-52.DOI: 10.11686/cyxb2023006

• 研究论文 • 上一篇    下一篇

紫色土坡耕地地埂草篱根系土壤抗蚀与抗冲性能特征研究

李鸿1(), 谌芸1(), 刘枭宏2, 刘有斌1, 都艺芝1   

  1. 1.西南大学资源环境学院,三峡库区生态环境教育部重点实验室,重庆 400715
    2.成都市水利水保监测中心,四川 成都 610501
  • 收稿日期:2023-01-05 修回日期:2023-03-27 出版日期:2023-11-20 发布日期:2023-09-27
  • 通讯作者: 谌芸
  • 作者简介:E-mail: sy22478@126.com
    李鸿(1979-),男,江西萍乡人,博士。E-mail: shuibaozbd@126.com
  • 基金资助:
    国家自然科学基金项目(41501288);西南大学“大学生创新创业训练计划”项目(202110635019);西南大学资源环境学院“光炯”培育项目(202008)

Factors affecting the soil erosion and scouring resistance of bank hedgerows in purple soil sloping cropland

Hong LI1(), Yun CHEN1(), Xiao-hong LIU2, You-bin LIU1, Yi-zhi DU1   

  1. 1.Key Laboratory of Eco-environment in the Three Gorges Reservoir Region,Ministry of Education,College of Resources and Environment,Southwest University,Chongqing 400715,China
    2.Chengdu Water Conservancy and Soil Conservation Monitoring Center,Chengdu 610501,China
  • Received:2023-01-05 Revised:2023-03-27 Online:2023-11-20 Published:2023-09-27
  • Contact: Yun CHEN

摘要:

为探明紫色土坡耕地不同地埂草篱根系土壤抗蚀和抗冲性的差异,以拉巴豆和紫花苜蓿地埂草篱为研究对象,以未种植草篱地埂为对照(CK),系统性地研究了土壤抗蚀和抗冲性能对草篱种类的响应,阐明了二者与根系形态特征及土壤理化性质间的耦合关系。结果表明:1)拉巴豆整株根系长度、根表面积和土壤有机质含量显著高于紫花苜蓿,且土壤含水率、总孔隙度和非毛管孔隙度显著高于紫花苜蓿和CK(P<0.05);2)土壤水稳性团聚体平均质量直径、平均几何直径及微团聚体团聚度大小表现为拉巴豆>紫花苜蓿,水稳性团聚体结构破坏率和微团聚体分散系数大小表现为紫花苜蓿>拉巴豆; 3)拉巴豆土壤抗冲指数及抗冲指数变化值均大于紫花苜蓿,抗冲指数是冲刷时间的对数函数,抗冲指数变化值是冲刷时间的二次函数;4)冗余分析的结果表明整株分叉数、根尖数、土壤有机质及非毛管孔隙度对土壤抗蚀和抗冲性能的影响较大,逐步回归的结果表明>0.5 mm的水稳性团聚体结构破坏率是影响土壤抗冲指数的决定因子。综上,拉巴豆地埂草篱土壤抗蚀和抗冲性能优于紫花苜蓿。本研究可为紫色土坡耕地地埂草篱技术的推广应用提供理论依据。

关键词: 拉巴豆, 地埂草篱, 团聚体, 抗冲指数, 土壤侵蚀

Abstract:

The purpose of this study was to investigate the differences in soil resistance to erosion and scouring for two different bank hedgerow species in purple soil sloping cropland. A systematic study was conducted to investigate the resistance of soil to erosion and scouring for two hedgerow species (Dolichos lablab and Medicago sativa), and to elucidate the coupling relationship between soil erosion and scouring, root parameters and soil physicochemical properties. Unplanted hedge ridges were used as an experiment control (CK). It was found that: 1) The root length, root surface area and soil organic matter content of D. lablab were significantly higher than those of M. sativa, and the soil moisture content, total porosity and non-capillary porosity were significantly higher than those of M. sativa and CK (P<0.05). 2) The mean weight diameter and geometrical mean diameter of water stability aggregate and agglomeration degree of microaggregates ranked D. lablab>M. sativa. Conversely, the percentage of aggregate disruption and dispersive coefficient of microaggregates was greater for M. sativa than for D. lablab. 3) The scouring-resistance index and the change in the scouring-resistance index were greater in D. lablab than in M. sativa. Logarithmic functions could be used to describe the relationships between the scouring-resistance index and time. Quadratic functions could be used to describe the relationships between the change in the scouring-resistance index with time. 4) The results of a redundancy analysis showed that root branches, root tips, soil organic matter and non-capillary porosity had the greatest effect on soil erosion-resistance and scouring resistance. The results of a stepwise regression showed that the percentage of aggregate disruption of water-stable aggregates >0.5 mm was the most influential factor in soil scouring-resistance. In conclusion, soil erosion-resistance and scouring-resistance of D. lablab hedgerows were better than those of M. sativa. Our results provide technical information for the effective establishment of bank hedgerows in purple soil sloping cropland.

Key words: Dolichos lablab, bank hedgerows, aggregate, anti-scourability index, soil erosion