崩岗区四种草本植物根系抗拉特性及其与化学成分的关系  

Relationship between Root Tensile Properties and Its Main Chemical Components of Four Kinds of Herbaceous Plants in Benggang Area

作　　者：黄炎和[1] 李思诗 岳辉 彭绍云 谢炎敏 林根根 周曼 吴俣 蔡学智 Huang Yanhe;Li Sishi;Yue Hui;Peng Shaoyun;Xie Yanmin;Lin Gengen;Zhou Man;Wu Yu;Cai Xuezhi(College of Resources and Environment,Fujian Agriculture and Forestry University,Fuzhou Municipality,Fujian Province 350002,China;Shenzhen Academy of Environmental Sciences,Shenzhen City,Guangdong Province 518001,China;Soil and Water Conservation Center of Changting County,Fujian Province 366300,China)

机构地区：[1]福建农林大学资源与环境学院,福建福州350002 [2]深圳市环境科学研究院,深圳518001 [3]长汀县水土保持中心,福建长汀366300

出　　处：《亚热带水土保持》2021年第4期9-15,共7页Subtropical Soil and Water Conservation

基　　金：国家科技支撑计划项目(2014BAD15B0303);福建省水利厅项目:长汀南方低山丘陵侵蚀区红壤改良提升关键技术与示范研究。

摘　　要：为探究长汀县崩岗区草本植物根系抗拉力学特性及其与化学成分的关系,以4种禾本科植物狗牙根(Cynodon dactylon)、宽叶雀稗(Paspalum wettsteinii)、香根草(Vetiveria zizanioides)、巨菌草(Pennisetum giganteum)根系为研究对象,进行室内单根拉伸试验和化学成分分析。结果表明:4种草本根系抗拉力与直径均呈幂函数正相关,而抗拉强度与直径均呈幂函数负相关;平均抗拉力大小表现为巨菌草(13.70 N)>香根草(12.12 N)>宽叶雀稗(8.46 N)>狗牙根(5.72 N),而平均抗拉强度表现为巨菌草(37.91 MPa)>宽叶雀稗(23.69 MPa)>狗牙根(17.90 MPa)≈香根草(17.89 MPa)。根系化学成分含量表现为纤维素含量(27.62%~36.17%)最大,半纤维素含量次之(21.28%~29.45%),木质素含量(9.62%~17.88%)最低,木纤比为0.30~0.64;狗牙根与宽叶雀稗、香根草与巨菌草根系化学成分含量总体上无显著差异。根系抗拉力主要受木纤比的影响,而抗拉强度主要受纤维素的影响。研究成果可为崩岗治理中先锋植物的筛选、配置和推广提供依据。In order to explore the tensile properties of herbaceous plants and their relationship with chemical components in the Benggang area of Changting County,the roots of 4 kinds of gramineous plant(Cynodon dactylon,Paspalum wettsteinii,Vetiveria zizanioides and Pennisetum giganteum)were selected for the tensile tests and chemical composition analysis.The results showed that the tensile strength and diameter of the four kinds of herbaceous roots were positively correlated with power function,while the tensile strength and diameter were negatively correlated with power function.The average tensile force was showed as follows:Pennisetum giganteum(13.70 N)>Vetiveria zizanioides(12.12 N)>Paspalum wettsteinii(8.46 N)>Cynodon dactylon(5.72 N),while the average tensile strength was showed as follows:Pennisetum giganteum(37.91 MPa)>Paspalum wettsteinii(23.69 MPa)>Cynodon dactylon(17.90 MPa)≈Vetiveria zizanioides(17.89 MPa).The content of chemical components in the root system showed that the cellulose content(27.62%~36.17%)was the largest,the hemicellulose content was second(21.28%~29.45%),and the lignin content(9.62%~17.88%)was the lowest.The ratio of lignin to cellulose was 0.30~0.64.There is no significant difference in the chemical composition content among the roots of Cynodon dactylon and Paspalum wettsteinii,Vetiveria zizanioides and Pennisetum giganteum.Among the chemical components,the root tensile force was mainly affected by the ratio of lignin to cellulose,while the root tensile strength was mainly affected by cellulose.These results can provide a basis for the selection,configuration and promotion of pioneer plants in the Benggang control.

关 键 词：禾本科 根系 抗拉力 抗拉强度 化学成分 

分 类 号：Q947.6[生物学—植物学]