寒旱环境植物护坡力学效应与根系化学成分响应  

Research on Mechanical Effects of the Vegetation on Slope Protection and Response of Root Chemical Compositions in Cold and Arid Environment

作　　者：乔娜[1] 余芹芹[1] 卢海静[1] 胡夏嵩[1,2] 李国荣[1] 朱海丽[1] 

机构地区：[1]青海大学地质工程系,西宁810016 [2]中国科学院青海盐湖研究所,西宁810008

出　　处：《水土保持研究》2012年第3期108-113,共6页Research of Soil and Water Conservation

基　　金：国家自然科学基金资助项目(40762002;41062010);教育部"新世纪优秀人才支持计划"资助项目(NCET-04-G983);长安大学西部矿产资源与地质工程教育部重点实验室开放基金资助(CHD2011SY016)

摘　　要：该项研究以试验区两种生长期为6a的灌木植物柠条锦鸡儿、霸王为例,分析了根系中所含半纤维素、木质素、纤维素和果胶质4种主要化学成分及其含量,并探讨了根系力学强度与其化学成分及其含量变化之间的关系。结果表明:柠条锦鸡儿根系平均抗拉强度为28.36～34.75MPa,霸王为4.53～6.61MPa,即柠条锦鸡儿根系平均抗拉强度显著大于霸王,且这两种灌木根系所含的4种化学成分由多至少依次为半纤维素、木质素、纤维素、果胶质,其中柠条锦鸡儿根系半纤维素含量为17.8%～29.03%,木质素为3.41%～5.36%,纤维素为2.3%～2.79%,果胶质为1.45%～2.15%;霸王根系半纤维素含量为15.6%～23.04%,木质素为3.69%～4.89%,纤维素为2.1%～3.06%,果胶质为1.92%～2.37%。两种灌木根系纤维素含量与根径、根系抗拉强度之间均表现出一定相关性;霸王根系半纤维素含量与其根系根径、抗拉强度之间呈相关性;柠条锦鸡儿根系果胶质含量与其根径、根系抗拉强度间均呈相关关系。本项研究可为进一步分析植物根系力学强度及其效应与根系组成特性之间的变化关系提供理论依据。Two kinds of shrubs named Caragana korshinskii and Zygophyllum xantho3cylon in testing area were examined. Four major chemical compositions and their contents, such as hemicelluloses, lignin, cellulose and pectin, were analyzed. Then the relationship between the tensile strength and contents of chemical compositions of roots were investigated. The test results showed： the average tensile strength of Caragana korshinskii roots with 28.36%34.75 MPa was significantly greater than that of Zygophyllum ：canthozcylon roots with 4.53%6.61 MPa. And the hemicelluloses contents in two shrubsI roots were the biggest following by lignin, cellulose, and pectin, for example, the content of hemicelluloses in Caragana korshinskii roots was 17.8-29.03%, the lignin was 3. 41%-5. 36%, the cellulose and pectin were 2.3%-2.79% and 1.45%-2.15%, respectively. In Zygophyllum aantho：zylon roots, contents of four chemical compositions were 15. 6%-23. 04% ofhemicelluloses, 3.69%-4.89% of lignin, 2.1%-3.06% of cellulose, 1. 925%- 2.37% of pectin. A significant correlation was shown between their root diameters, the cellulose content and their tensile strength in both two shrubs. For Zygophyllum zcanthoxylon roots, it also showed a significant correlation between its root diameter, its hemicelluloses content and its tensile strength. However, for Caragana korshinskii, the change of the pectin content of roots affected its diameter and tensile strength extraordinarily. The study results will provide a theoretical basis for further analyzing a relationship between plant root mechanical strength and effect of the composition characteristics of roots.

关 键 词：植物根系 力学效应 抗拉力 抗拉强度 化学成分 

分 类 号：S714.7[农业科学—林学]