| PAM和草类根系对荒坡紫色土物理性质与抗剪性能的影响 |
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| 引用本文： | 李铁,王润泽,谌芸,何丙辉,周涛,吴晨,刘枭宏. PAM和草类根系对荒坡紫色土物理性质与抗剪性能的影响[J]. 草业学报, 2018, 27(2): 69-78. DOI: 10.11686/cyxb2017138 |
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| 作者姓名： | 李铁 王润泽 谌芸 何丙辉 周涛 吴晨 刘枭宏 |
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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;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(41501288),重庆市基础科学与前沿技术研究一般项目(cstc2017jcyjAX0472),中央高校基本科研业务费专项(XDJK2015C170;XDJK2017D206),西南大学第九届本科生科技创新基金项目(20162402008),西南大学资源环境学院“光炯”项目(201719) |
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| 摘 要： | 为探讨PAM(聚丙烯酰胺)和草类根系对荒坡紫色土物理性质与抗剪性能的影响,选取荒坡紫色土为研究对象,制备了单施PAM、单植草类和“草类+PAM”等试验处理,采用WinRHIZO(Pro.2004c)根系分析系统和ZJ型应变控制式直剪仪分别测定根系指标和土壤/根-土复合体抗剪强度,结合土壤基本物理性质指标,分析了各处理中PAM、草类根系、土壤物理性质及抗剪性能间的关系。结果表明:1)上述处理均能够显著提高土壤通气持水能力,其中“草类+PAM”对土壤孔隙度和含水率的改善效果最好,其次是单植草类;2)各处理的大粒级范围(1~0.25 mm、0.25~0.05 mm)微团聚体含量增加,小粒级范围(<0.01 mm)的则减少;3)较之CK,单植草类和“草类+PAM”可使土壤内摩擦角φ平均值分别提高37.12%和36.59%,黏聚力c平均值分别提高69.47%和83.64%,且根表面积密度(RSAD)和0.7 mm
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| 关 键 词： | PAM 微团聚体 抗剪强度 根表面积密度 水土流失 |
| 收稿时间： | 2017-03-21 |
| 修稿时间： | 2017-06-15 |
Effects of polyacrylamide and grass root system on shear strength and physical properties of purple soil on barren slopes |
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| LI Tie,WANG Run-ze,CHEN Yun,HE Bing-hui,ZHOU Tao,WU Chen,LIU Xiao-hong. Effects of polyacrylamide and grass root system on shear strength and physical properties of purple soil on barren slopes[J]. Acta Prataculturae Sinica, 2018, 27(2): 69-78. DOI: 10.11686/cyxb2017138 |
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| Authors: | LI Tie WANG Run-ze CHEN Yun HE Bing-hui ZHOU Tao WU Chen LIU Xiao-hong |
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| Affiliation: | College of Resources and Environment, Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Southwest University, Chongqing 400715, China |
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| Abstract: | We studied the effects of polyacrylamide (PAM) and the grass root system on the shear strength and physical properties of purple soil on barren slopes.Three different treatments were applied to purple soil on barren slopes:PAM (single application of PAM),grass (single planting of grasses),and grass +PAM.The root parameters were measured using the WinRHIZO (Pro.2004c) root analysis system and soil shear strength of soil samples was determined using a ZJ-type strain-controlled direct shear apparatus.We also determined the basic physical properties of soil samples.The main results were as follows∶ 1) All three treatments significantly improved the soil water holding capacity.The grass+PAM treatment had the best effects on soil porosity and water content,followed by the grass treatment.2) All three treatments significantly increased the abundance of microaggregates in the 1-0.25 mm and 0.25-0.05 mm size ranges,and decreased the abundance of those in the smaller size category (＜0.01 mm).3) The average internal friction angle of grass was 37.12％ and 36.59％ higher in the grass and grass+PAM treatments,respectively,than in the control,and the average soil cohesion in the grass and grass+PAM treatments was increased by 69.47％ and 83.64％,respectively.The root surface area density and abundance of roots with diameter between 0.7 mm and 0.9 mm were the main factors affecting the shear properties of soil.4) The growth of grass roots was markedly affected by PAM,which increased the average root length density,root surface area density,root volume density,and root weight density of Cynodon dactylon soil samples by 15.57％-53.16％,and of Trifolium repens soil samples by 23.02％-80.00％. |
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