香根草和马唐的根系特征及对坡地紫色土抗侵蚀性的影响

doi:10.11686/cyxb2016353

草业学报 ›› 2017, Vol. 26 ›› Issue (7): 45-54.DOI: 10.11686/cyxb2016353

香根草和马唐的根系特征及对坡地紫色土抗侵蚀性的影响

王润泽¹, 谌芸^{1, *}, 李铁¹, 彭石磊¹, 刘志鹏¹, 单志杰²

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.中国水利水电科学研究院,流域水循环模拟与调控国家重点实验室,北京 100048

收稿日期:2016-09-21 出版日期:2017-07-20 发布日期:2017-07-20
通讯作者: E-mail:sy22478@126.com
作者简介:王润泽(1990-),男,山东淄博人,在读硕士。E-mail:704784686@qq.com
基金资助:
国家重点研发计划项目(2016YFC0502303),国家自然科学基金(41501288),中央高校基本科研业务费专项(XDJK2015C170,XDJK2014C103)和水利部公益性行业科研专项经费项目(201501045)资助

Root distribution characteristics of Vetiveria zizanioides and Digitaria sanguinalis and their effects on the anti-erodibility of purple soil in slopelands

WANG Run-Ze¹, CHEN Yun^{1, *}, LI Tie¹, PENG Shi-Lei¹, LIU Zhi-Peng¹, SHAN Zhi-Jie²

1.College of Resources and Environment, Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Southwest University, Chongqing 400715, China;
2.China Institute of Water Resources and Hydropower Research, State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100048, China

Received:2016-09-21 Online:2017-07-20 Published:2017-07-20

摘要/Abstract

摘要： 为探讨紫色土区草类根系特征及对土壤抗侵蚀性的影响,本试验选取坡地香根草和马唐为研究对象,分0~10 cm、10~20 cm和20~30 cm土层采集根系和土壤样品,分别采用WinRHIZO(Pro.2004c)根系分析系统、ZJ型应变控制式直剪仪和改进的原状土冲刷水槽测定根系指标、根-土复合体抗剪和抗冲性能,研究了不同土层香根草和马唐的根系特征及与土壤抗侵蚀性之间的关系。结果表明,0~30 cm土层范围内,香根草根系的总体指标和径级指标(根长密度、根表面积密度、根体积密度和根重密度)均优于马唐;较之马唐,香根草更有利于降低土壤容重,改善土壤微团聚体组成状况和提高土壤有机碳含量;上述2种草类根-土复合体的抗冲剪性能均表现为:0~10 cm土层最优,10~20 cm土层次之,20~30 cm土层最差,且各土层均表现为香根草的优于马唐的;相关分析表明,1.0<d(直径)≤2.0 mm是影响复合体粘聚力和抗冲指数的关键径级,其次是径级d≤1.0 mm。本研究结果可为紫色土区水土保持植被构建提供理论依据。

Abstract: The aim of this study was to investigate the characteristics of grass root distribution and its effects on soil anti-erodibility in purple soil areas. Two grass species, Vetiveria zizanioides and Digitaria sanguinalis, growing on slopelands were chosen as the experimental materials. Root and soil samples were taken from 0-10, 10-20, and 20-30 cm soil depths. Root parameters, soil shear strength, and anti-scourability of the root-soil system were measured to explore the relationship between root distribution and soil anti-erodibility. The values of overall root parameters and diameter parameters (root length density, root surface area density, root volume density, and root weight density) were higher for V. zizanioides roots than for D. sanguinalis roots in 0-30 cm soils. Compared with D. sanguinalis roots, V. zizanioides roots were more conducive to reducing soil bulk density, improving soil microaggregate composition, and increasing the soil organic carbon content. Soil shear strength and anti-scourability of the root-soil systems were highest in 0-10 cm soils and lowest in 20-30 cm soils. The values of both parameters were higher for V. zizanioides than for D. sanguinalis. A correlation analysis indicated that 1.0<d (diameter)≤2.0 mm was the critical diameter class affecting cohesion and the anti-scourability index, followed by d≤1.0 mm. The results of this study provide a theoretical basis for vegetation management strategies to conserve soil and water in purple soil areas.

王润泽, 谌芸, 李铁, 彭石磊, 刘志鹏, 单志杰. 香根草和马唐的根系特征及对坡地紫色土抗侵蚀性的影响[J]. 草业学报, 2017, 26(7): 45-54.

WANG Run-Ze, CHEN Yun, LI Tie, PENG Shi-Lei, LIU Zhi-Peng, SHAN Zhi-Jie. Root distribution characteristics of Vetiveria zizanioides and Digitaria sanguinalis and their effects on the anti-erodibility of purple soil in slopelands[J]. Acta Prataculturae Sinica, 2017, 26(7): 45-54.

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香根草和马唐的根系特征及对坡地紫色土抗侵蚀性的影响

Root distribution characteristics of Vetiveria zizanioides and Digitaria sanguinalis and their effects on the anti-erodibility of purple soil in slopelands

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