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.
作者
聂晖
李翀
张金池
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)
出处
《安徽农业大学学报》
CAS
CSCD
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。
关键词
保水剂
矿山修复
根系生长
根土力学性质
water-retaining agent
mine restoration
root growth
mechanical properties of root-reinforced soil
