| 保水剂添加对刺槐根土力学特性的影响 |
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| 引用本文： | 聂晖,李翀,张金池,贾赵辉,马仕林,曾婧祎,陈美玲.保水剂添加对刺槐根土力学特性的影响[J].安徽农业大学学报,2022,49(5):707. |
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| 作者姓名： | 聂晖 李翀 张金池 贾赵辉 马仕林 曾婧祎 陈美玲 |
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| 作者单位： | 南京林业大学南方现代林业协同创新中心，江苏省水土保持与生态修复重点实验室，南京 210037 |
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| 基金项目： | 江苏省林业科技创新与推广项目(LYKJ[2021]30), 百山祖国家公园科学研究项目(2021ZDLY01), 江苏高校优势学科建设工程资助项目(PAPD)和江苏省科技计划项目(BE2022420)共同资助。 |
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| 摘 要： | 为探究保水剂对根系生长和根土复合体力学特性的影响，为促进矿山植被恢复提供理论依据，在刺槐盆栽土中加入保水剂，3个处理分别为B1(0％)，B2(0.3％)和B3(0.5％)。通过对比分析土壤养分，土壤酶活性，根系生长参数，根系抗拉力和根土复合体抗剪强度，以及它们之间的相关性，探究保水剂添加对根土复合体稳定性的影响。结果表明：(1)在0.3%和0.5%保水剂浓度梯度下，保水剂添加降低了刺槐根系的抗拉力；(2)不同保水剂浓度对刺槐根土复合体抗剪强度有不同效果，在0.3％保水剂浓度处理下，刺槐根土复合体抗剪强度显著降低，而在0.5％保水剂浓度处理下，刺槐根土复合体抗剪强度没有显著变化；(3)抗拉力、抗剪强度与纤维素，半纤维素呈负相关关系，与木质素呈正相关关系，刺槐根土复合体抗剪强度主要受内聚力影响。可见在0.3%和0.5%保水剂浓度梯度下，保水剂添加降低了刺槐根系拉伸性能，根土力学特性与根系内部成分显著相关。
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| 关 键 词： | 保水剂 矿山修复 根系生长 根土力学性质 |
| 收稿时间： | 2021/12/21 0:00:00 |
Effects of water retaining agent on root soil mechanical properties of Robinia pseudoacacia |
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| NIE Hui,LI Chong,ZHANG Jinchi,JIA Zhaohui,MA Shilin,ZENG Jingyi,CHEN Meiling.Effects of water retaining agent on root soil mechanical properties of Robinia pseudoacacia[J].Journal of Anhui Agricultural University,2022,49(5):707. |
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| Authors: | NIE Hui LI Chong ZHANG Jinchi JIA Zhaohui MA Shilin ZENG Jingyi CHEN Meiling |
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| Institution: | Jiangsu Province Key Laboratory of Soil and Water Conservation and Ecological Restoration, Co-Innovation Center for the Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037 |
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| Abstract: | To explore the effects of water-retaining agent on root growth and root-reinforced soil mechanical properties, and provide a theoretical basis for promoting mine restoration, a water-retaining agent was added to the potting soil of Robinia pseudoacacia, and three treatments were: B1 (0%), B2 (0.3%) and B3 (0.5%), respectively. The effects of water retention agent addition on the stability of root-soil complex were investigated by comparing and analyzing soil nutrients, soil enzyme activity, root growth parameters, root tensile strength and root-soil complex shear strength, and the correlation between them. The results showed that: (1) Under the concentration gradients of 0.3% and 0.5 % water retention agents, the addition of water retention agents reduced the tensile strength of Robinia pseudoacacia roots; (2)There were different effects on root-reinforced soil shear strength with different water-retaining agent concentrations, under the treatment of 0.3% water-retaining agent concentration, the root-reinforced soil shear strength was significantly reduced, while under the treatment of 0.5% water-retaining agent concentration, the root-reinforced soil shear strength did not change significantly; (3)Tensile strength and shear strength were negatively correlated with cellulose and hemicellulose, and positively correlated with lignin. The root-reinforced soil shear strength was mainly affected by cohesion. In conclusion, at the concentration gradient of 0.3% and 0.5%, the addition of water retaining agent decreased the tensile properties of Robinia pseudoacacia roots, and the mechanical properties of roots were significantly related to the internal components of roots. |
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| Keywords: | water-retaining agent mine restoration root growth mechanical properties of root-reinforced soil |
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