滇中亚高山草甸土理化性质和崩解特性关系
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王忠良(1998—),男,硕士研究生,主要从事水土保持与土壤侵蚀防控研究。E-mail:3154534715@qq.com

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S157.1

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云南省水利科技重大专项(2023BG204001);国家自然科学基金项目(42167046)


Relationship Between Physicochemical Properties and Disintegration Characteristics of Subalpine Meadow Soils in Central Yunnan
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    摘要:

    [目的] 工程扰动加剧亚高山草甸水土流失和植被破坏。研究滇中亚高山草甸土理化性质和崩解特性关系,为亚高山草甸水土流失防控和植被保护提供参考。[方法] 通过X射线衍射、电镜扫描和静水崩解试验等,测定滇中亚高山草甸土矿物成分、微观结构等理化性质和崩解特性,分析土壤崩解特性与理化性质的相关性,探讨滇中亚高山草甸土崩解原因。[结果] (1)滇中亚高山草甸土遇水易崩解,同一土层不同母质抗崩解特性表现为砂岩>石灰岩≈玄武岩,同一母质不同土层表现为淋溶层>淀积层>母质层。(2)相关性分析表明,土壤平均崩解速率与有机质(r=-0.84)、全氮(r=-0.83)呈极显著负相关,与黏粒(r=0.88)呈极显著正相关,与蒙脱石(r=0.68)、四氧化三铁(r=0.77)呈显著正相关。(3)生物作用和蒙脱石、伊利石等亲水性黏土矿物的膨胀作用是影响滇中亚高山草甸土崩解特性的主要原因。[结论] 滇中亚高山草甸土不同母质抗崩解特性为砂岩>石灰岩≈玄武岩,不同土层抗崩解特性为淋溶层>淀积层>母质层;滇中亚高山草甸土遇水易崩解,生物作用和蒙脱石、伊利石等亲水性黏土矿物的膨胀作用是影响滇中亚高山草甸土崩解性的主要原因。

    Abstract:

    [Objective] The engineering disturbances have triggered soil erosion events in subalpine meadows, intensify regional soil erosion and vegetation destruction. The relationship between physical and chemical properties and disintegration characteristics of subalpine meadow soils in central Yunnan was studied to provide reference for soil and water conservation and control and vegetation protection in sub-alpine meadow ecosystems. [Methods] By X-ray diffraction, electron microscopy scanning, and static water disintegration experiments were conducted to determine the physico-chemical properties, mineral composition, microscopic structure, and disintegration characteristics of subalpine meadow soils in central Yunnan. The correlation between soil disintegration and physico-chemical properties was analyzed to explore the reason of soil disintegration in sub-alpine meadows of central Yunnan. [Results] (1) The subalpine meadow soils in central Yunnan exhibited a high susceptibility to disintegration when encountering water. The resistance to disintegration of different parent materials in the same soil layer were as follows sandstone>limestone≈basalt. The characteristics of different soil layers in the same parent material were as follows leaching horizon>deposition layer>parent material layer. (2) Correlation analysis showed that the average soil disintegration rate was significantly negative correlated with organic matter (r=-0.84) and total nitrogen (r=-0.83), positively correlated with clay content (r=0.88), and positively correlated with montmorillonite (r=0.68) and hematite (r=0.77). (3) The main factors affecting the disintegration of subalpine meadow soils in central Yunnan were biological processes and swelling of hydrophilic clay minerals such as montmorillonite and illite. [Conclusion] The resistance to disintegration of subalpine meadow soils in central Yunnan was ranked as follows: Sandstone>limestone≈basalt for different parent materials, and leaching horizon>deposition layer>parent material layer for different soil layers. The subalpine meadow soil in central Yunnan was easy to disintegrate when exposed to water, the main factors affecting the disintegration of subalpine meadow soils in central Yunnan were biological processes and swelling of hydrophilic clay minerals such as montmorillonite and illite.

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王忠良, 范春梅, 段继琪, 陈正发, 李建兴, 段青松.滇中亚高山草甸土理化性质和崩解特性关系[J].水土保持学报,2024,38(4):170~180

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  • 收稿日期:2024-01-06
  • 最后修改日期:2024-02-20
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  • 在线发布日期: 2024-07-24
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