[1]刘昌义a,胡夏嵩a*,李希来b,等.黄河源区高寒草地根—土复合体抗剪强度与土壤营养元素分布关系[J].山地学报,2020,(3):349-359.[doi:10.16089/j.cnki.1008-2786.000515]
 LIU Changyia,HU Xiasonga*,LI Xilaib,et al.Relationship Between Shear Strength of Root-Soil Composite Systems of Alpine Grassland and Distribution of Soil Nutrient Elements in the Source Region of the Yellow River, China[J].Mountain Research,2020,(3):349-359.[doi:10.16089/j.cnki.1008-2786.000515]
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黄河源区高寒草地根—土复合体抗剪强度与土壤营养元素分布关系()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2020年第3期
页码:
349-359
栏目:
山地环境
出版日期:
2020-07-20

文章信息/Info

Title:
Relationship Between Shear Strength of Root-Soil Composite Systems of Alpine Grassland and Distribution of Soil Nutrient Elements in the Source Region of the Yellow River, China
文章编号:
1008-2786-(2020)3-349-11
作者:
刘昌义1a胡夏嵩1a2*李希来1b申紫雁1a
1. 青海大学 a. 地质工程系; b. 农牧学院,西宁 810016; 2. 中国科学院青海盐湖研究所 中国科学院盐湖资源综合高效利用重点实验室,西宁 810008
Author(s):
LIU Changyi1a HU Xiasong1a2* LI Xilai1b SHEN Ziyan1a
1a. Geological Engineering Department, 1b. Agriculture and Animal Husbandry, Qinghai University, Xining 810016, China; 2. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
关键词:
黄河源区 高寒草地 抗剪强度 营养元素 水土流失
Keywords:
the source region of the Yellow River alpine grassland shear strength nutrient element water and soil loss
分类号:
P642.5
DOI:
10.16089/j.cnki.1008-2786.000515
文献标志码:
A
摘要:
植物类型及土壤营养元素含量等因素随植物群落演替而发生规律性变化,并影响植物根-土复合体抗剪强度。本文选择黄河源区高寒草地,开展植物根-土复合体直接剪切试验及土壤营养元素含量测试,分析区内不同植物群落根-土复合体抗剪强度与土壤营养元素分布之间的关系。结果表明:区内草地沿剖面线方向分布4种植物群落类型,即:高山嵩草-矮嵩草群落、高山嵩草-异针茅-垂穗披碱草群落、青藏苔草+藏嵩草群落和藏嵩草群落; 土壤营养元素含量总体表现出由边坡高海拔位置向低海拔位置逐渐增大的变化特征,有机质含量在坡顶相对最小为59.48 g·kg-1,在坡底最大可达178.13 g·kg-1,增加值为117.65 g·kg-1; 植物根-土复合体黏聚力c值随边坡海拔降低而逐渐增大,即坡顶位置为21.70 kPa,至一级阶地位置达到最大为34.87 kPa; 进一步研究表明,区内根-土复合体抗剪强度与营养元素含量间存在一定程度相关关系,即营养元素含量相对较高位置处其植物根系相对较发达且密集分布,其根-土复合体抗剪强度亦相对较大。研究结果对于科学有效地防治黄河源区高寒草地水土流失、浅层滑坡等现象,具有理论研究价值。
Abstract:
Plant type and soil nutrient content change regularly with the succession of plant community and affect the shear strength of plant root-soil composite system. Alpine grassland in the source region of the Yellow River was selected as the study area in this research, direct shear tests of root-soil composite systems and soil nutrient content tests were conducted, and the relationship between shear strength of root-soil composite system and soil nutrient elements was analyzed. The result showed that the grassland was evolved into four types of plant communities on the slope profile, which were: Kobresia pygmaea C.B.Clarke - Kobresia humilis Serg community, Kobresia pygmaea C.B.Clarke - Stipa aliena Keng - Elymus nutans Griseb. community, Carex moocroftii Falc.ex Boott + Kobresia tibetica Maximowicz community and Kobresia tibetica Maximowicz community. The distribution of soil nutrient content showed a increasing characteristic from higher altitude to lower altitude in the slope. The content of soil organic matter was 59.48 g·kg-1 at the top and 178.13 g·kg-1 at the bottom, increasing by 117.65 g·kg-1. The cohesion force of root-soil composite systems also showed a gradual increasing trend with the decreasing of altitude. Namely, the cohesion force was 21.70 kPa at the top position, and reached maximum of 34.87 kPa at the first grade terrace. Further research indicated that there was a correlation between the shear strength of root-soil composite systems and the soil nutrient element contents, namely, the plant roots developed well on the place where the nutrient were relatively high, so that the shear strength of the root-soil composite system was relatively large. The results of this research are of great theoretical value in scientifically preventing and controlling water and soil loss and shallow landslides in alpine grassland of the source region of the Yellow River.

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备注/Memo

备注/Memo:
收稿日期(Received date):2019-01-03; 改回日期(Accepted date): 2020-01-06
基金项目(Foundation item):国家自然科学基金资助项目(41572306)。[National Natural Science Foundation of China(41572306)]
作者简介(Biography):刘昌义(1991-),男,四川宜宾人,硕士,助理实验师,主要研究方向:地质工程与环境地质。[LIU Changyi(1991-), male, born in Yibin, Sichuan province, M.Sc. candidate, laboratory technician, research on geological engineering and environmental geology] E-mail: 1358128151@qq.com
*通讯作者(Corresponding author):胡夏嵩(1965-),男,博士,教授。主要研究方向:地质工程与环境地质。[HU Xiasong(1965-), male, Ph. D., professor, research on geological engineering and environmental geology] E-mail: huxiasong@tsinghua.org.cn
更新日期/Last Update: 2020-05-30