保水剂添加对刺槐根土力学特性的影响  

Effects of water retaining agent on root soil mechanical properties of Robinia pseudoacacia

作　　者：聂晖 李翀 张金池[1] 贾赵辉 马仕林 曾婧祎 陈美玲 NIE Hui;LI Chong;ZHANG Jinchi;JIA Zhaohui;MA Shilin;ZENG Jingyi;CHEN Meiling(Jiangsu Province Key Laboratory of Soil and Water Conservation and Ecological Restoration,Co-Innovation Center for the Sus-tainable Forestry in Southern China,College of Forestry,Nanjing Forestry University,Nanjing 210037)

机构地区：[1]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

出　　处：《安徽农业大学学报》2022年第5期707-715,共9页Journal of Anhui Agricultural University

基　　金：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);江苏省科技计划项目(BE2022420)共同资助。

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。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.

关 键 词：保水剂 矿山修复 根系生长 根土力学性质 

分 类 号：S714.7[农业科学—林学]