| 三峡库区陡坡根-土复合体抗冲性能 |
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| 引用本文： | 谌芸,何丙辉,练彩霞,刘志鹏,彭石磊.三峡库区陡坡根-土复合体抗冲性能[J].生态学报,2016,36(16):5173-5181. |
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| 作者姓名： | 谌芸 何丙辉 练彩霞 刘志鹏 彭石磊 |
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| 作者单位： | 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,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,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,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,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 |
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| 基金项目： | 国家自然科学基金项目（41271291，41501288）；中央高校基本科研业务费专项项目（SWU113013，XDJK2014C103，XDJK2015C170）；国家科技支撑计划项目（2011BAD31B03）；西南大学教育教学改革研究项目（2013JY052） |
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| 摘 要： | 以三峡库区已种植4a的紫花苜蓿、百喜草、狗牙根和香根草为对象,并以裸地为对照,采用改进的冲刷水槽、WinRHIZO(Pro.2004c)根系分析系统和应变控制式直剪仪,分析测定5个处理根-土复合体抗冲性能以及根系、土壤参数,以期揭示不同草本植物根系对陡坡地紫色土表土抗冲性能的强化效应。研究结果表明:与对照(裸地)相比,4种草本植物根系均能显著增强紫色土表土的抗冲性能,其中香根草根-土复合体的抗冲性能最强(为对照小区的2.75—3.58倍),而紫花苜蓿复合体的抗冲性能最弱(为对照小区1.96—2.60倍);草本植物根长密度(RLD)和根表面积密度(RSAD)是影响陡坡下紫色土表土抗冲性能的主要因子;0.50 mmd≤1.50 mm径级的根系有利于土壤抗冲性能的增强,尤其是1.00 mmd≤1.50 mm径级的根系对根-土复合体的抗冲性能强化效应最大;4种草本植物根系均有利于降低土壤容重、提高土壤有机质含量和增强土壤抗剪性能;土壤粘聚力c是影响根-土复合体抗冲性能的又一主要因子,径级1.00 mmd≤2.00 mm的根系则最有利于提高土壤粘聚力c。
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| 关 键 词： | 紫色土 草本植物根系 抗冲指数 抗剪强度 粘聚力 |
| 收稿时间： | 2015/1/27 0:00:00 |
| 修稿时间： | 2016/6/8 0:00:00 |
Root-soil system anti-scourability on steep slopes in the Three Gorges Reservoir Area |
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| CHEN Yun,HE Binghui,LIAN Caixi,LIU Zhipeng and PENG Shilei.Root-soil system anti-scourability on steep slopes in the Three Gorges Reservoir Area[J].Acta Ecologica Sinica,2016,36(16):5173-5181. |
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| Authors: | CHEN Yun HE Binghui LIAN Caixi LIU Zhipeng and PENG Shilei |
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| Institution: | College of Resources and Environment/Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Southwest University, Chongqing 400715, China,College of Resources and Environment/Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Southwest University, Chongqing 400715, China,College of Resources and Environment/Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Southwest University, Chongqing 400715, China,College of Resources and Environment/Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Southwest University, Chongqing 400715, China and College of Resources and Environment/Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), Southwest University, Chongqing 400715, China |
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| Abstract: | |
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| Keywords: | purple soil grass roots anti-scourability soil shear strength soil cohesion |
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