[1]YU Dongmei,QI Zhaoxin,LIU Yabin,et al.Factors Affecting Shear Strength and Contribution Evaluation of Root-Soil Composite Systems of Five Halophytes in the Salt Lake Region of Northwest Qaidam Basin, Qinghai Province[J].Research of Soil and Water Conservation,2019,26(04):157-165.
Copy
Factors Affecting Shear Strength and Contribution Evaluation of Root-Soil Composite Systems of Five Halophytes in the Salt Lake Region of Northwest Qaidam Basin, Qinghai Province
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
26
Number of periods:
2019 04
Page number:
157-165
Column:
Public date:
2019-06-11
- Title:
- Factors Affecting Shear Strength and Contribution Evaluation of Root-Soil Composite Systems of Five Halophytes in the Salt Lake Region of Northwest Qaidam Basin, Qinghai Province
- CLC:
- S152;S153
- DOI:
- -
- Abstract:
- To explore the factors which affect shear strength of five halophyte root-soil composite systems and the characteristics of shear strength, the region around the Gasikule Salt in Qiadam Basin was selected as the test site. First, five predominate indigenous plant species such as Phragmites australis Trin., Triglochin maritimum Linn., Carex enervis C. A. Mey., Leymus secalinus (Georgi) Tzvel., Koeleria cristata (L.) Pers. were taken as test plants; then indoor direct shear tests were conducted on the rooted soil of the five species to investigate the effects of such factors as Bulk density, moisture content, root length density, root weight density, and root area ratio on the shear strength of rooted soil; finally, based on the above tests, grey correlation method was adopted to further evaluate the degrees of the effects of these factors on the shear strength of rooted soil. The results have testified the grey correlations of cohesion force (c) and internal friction angel (φ) with the factors, that is, the correlation of bulk density to c and φ is 0.740 and 0.879, 0.698 and 0.849 for moisture content, 0.692 and 0.609 for root weight density, 0.655 and 0.519 for root length density, 0.631 and 0.569 for root area ratio; among the five factors, there is a significant correlation between bulk density and shear strength of rooted soil for the five species. Phragmites australis root enhancing soil cohesion c value is relatively significant because the root system is approximately vertical in the soil. Therefore, most of the roots in the sample pass through the shear plane, that is, when the composite shear deformation occurs, the root system in the sample can basically play a role in resisting shear deformation. The results can be significance of preventing water and soil loss and controlling shallow landslides and other natural disasters in the areas with similar geological and climatic conditions.
- References:
-
[1] 王遵亲,祝寿泉,俞仁培,等.中国盐渍土[M].北京:科学出版社,1993.
[2] 贾恢先,孙学刚.中国西北内陆盐生植物图谱[M].北京:中国林业出版社,2005.
[3] 罗友弟.青海地区盐渍土分布规律及其盐胀溶陷机制探讨[J].水文地质工程地质,2010,37(4):116-120.
[4] 李旭谦.柴达木盆地草地生产条件及发展潜力[J].青海草业,2004,13(2):30-33.
[5] 苗芸,孙克成,魏华.盐渍土路基病害特征分析[J].华东公路,2015(1):16-19.
[6] 仲德春.西宁地区盐渍土的分布特征及地基处理研究[J].青海大学学报:自然科学版,2011,29(2):30-33.
[7] 温利强,杨成斌,李士奎.中国西北地区盐渍土分布及危害[J].工程与建设,2010,24(5):585-587.
[8] 王云琦,王玉杰,张洪江,等.重庆缙云山不同土地利用类型土壤结构对土壤抗剪性能的影响[J].农业工程学报,2006,22(3):40-45.
[9] 陈安强,张丹,熊东红,等.元谋干热河谷坡面表层土壤力学特性对其抗冲性的影响[J].农业工程学报,2012,28(5):108-113.
[10] 赵玉娇,胡夏嵩,李华坦,等.寒旱环境灌木根系增强边坡土体抗剪强度特征[J].农业工程学报,2016,32(11):174-180.
[11] Fu J T, Hu X S, Brierley G, et al. The influence of plant root system architectural properties upon the stability of loess hillslopes, Northeast Qinghai, China[J]. Journal of Mountain Science, 2016,13(5):785-801.
[12] 张惠忍,李法虎,张心平.天然草本植被根系对表层土壤抗剪强度的影响[J].中国农业大学学报,2015,20(4):189-195.
[13] Pirnazarov A, Sellgren U. Reduced testing and modelling of the bearing capacity of rooted soil for wheeled forestry machines[J]. Journal of Terramechanics, 2015,60:23-31.
[14] 叶传永.尕斯库勒盐湖卤水与沉积物中铀的分布及富集机理[D].北京:核工业北京地质研究院,2013.
[15] 黄麒,韩凤清.柴达木盆地盐湖演化与古气候波动[M].北京:科学出版社,2007.
[16] 范喆.尕斯库勒湖泊钻孔记录的地球化学元素变化及古环境演化[D].兰州:兰州大学,2010.
[17] 南京水利科学研究院.土工试验规程SL237-1999[S].北京:中国水利水电出版社,1999.
[18] 徐少君,曾波,类淑桐,等.三峡库区几种耐水淹植物根系特征与土壤抗水蚀增强效应[J].土壤学报,2011,48(1):160-167.
[19] Bland W A, Dugas W A. Root length density from minirhizotron observations[J]. Agronomy Journal, 1988,80(2):271-275.
[20] Fan C C. A displacement-based model for estimating the shear resistance of root-permeated soils[J]. Plant and Soil, 2012,355(1/2):103-119.
[21] Preti F, Dani A, Laio F. Root profile assessment by means of hydrological, pedological and above-ground vegetation information for bio-engineering purposes[J]. Ecological Engineering, 2010,36(3):305-316.
[22] 张金珠,王振华,虎胆·吐马尔白.秸秆覆盖对滴灌棉花土壤水盐运移及根系分布的影响[J].中国生态农业学报,2013,21(12):1467-1476.
[23] 杨亚川,莫永京,王芝芳,等.土壤-草本植被根系复合体抗水蚀强度与抗剪强度的试验研究[J].中国农业大学学报,1996,1(2):31-38.
[24] 张晓勉,张金池,王云南,等.钱塘江源头主要植被类型土壤抗剪强度研究[J].水土保持研究,2015,22(4):79-84.
[25] Czarnes S, Hallett P D, Bengough A G, et al. Root-and microbial-derived mucilages affect soil structure and water transport[J]. European Journal of Soil Science, 2000,51(3):435-443.
[26] 刘益良,刘晓立,付旭,等.植物根系对低液限粉质黏土边坡浅层土体抗剪强度影响的试验研究[J].工程地质学报,2016,24(3):384-390.
[27] 范兴科,蒋定生.黄土高原浅层原状土抗剪强度浅析[J].土壤侵蚀与水土保持学报,1997,3(4):69-75.
[28] 张晓明,王玉杰,夏一平,等.重庆缙云山典型植被原状土抗剪强度的灰色关联度分析与评价[J].水土保持研究,2007,14(2):145-147.
[29] 王宇超,王得祥.盐胁迫对木本滨藜叶绿素合成及净光合速率的影响[J].农业工程学报,2012,28(10):151-158.
[30] 李光莹,付江涛,余冬梅,等.碱胁迫条件下草本植物根系力学强度试验研究[J].工程地质学报,2016,24(4):584-596.
[31] 闫俊华,周国逸,申卫军.用灰色关联法分析森林生态系统植被状况对地表径流系数的影响[J].应用与环境生物学报,2000,6(3):197-200.
[32] 李想,王瑄,盛世博,等.不同土地利用方式土壤抗剪强度及其影响因子分析[J].水土保持学报,2016,30(5):102-106.
[33] 王磊.植被根系固土力学机理试验研究[D].南京:南京林业大学,2011.
- Similar References:
Memo
-
Last Update:
1900-01-01