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首页> 中文期刊> 《中国草地学报》 >退化程度对三江源泽库高寒草甸土壤理化性质及持水能力的影响

退化程度对三江源泽库高寒草甸土壤理化性质及持水能力的影响

         
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摘要

The effects of different degradation degree on soil physicochemical properties and soil water-holding capacity in Zeku alpine meadow in the headwater region of three rivers was analyzed by both of field monitoring and indoor experiment methods.The results showed that: (1) soil anti-erosion ability was significantly reduced by the degradation and disappearance of grass layer in alpine meadow.Soil hardness and soil shear strength was gradually increased from original vegetation to middle degradation period, while both of them were significantly decreased during severe degradation period (P<0.05).(2)Soil in alpine meadow became depleted with the aggravation of degradation degree,and with the increasing of soil depth, the effects of degradation degree on SOC and TN was gradually decreased.(3) The effects of degradation degree on soil water-holding capacity in alpine meadow was decreased with the increasing of soil depth, and soil water-holding capacity of surface soil (0～10cm) was significantly affected by degradation degree.From original vegetation to middle degradation period, the saturated water content, capillary water content and field capacity in depth of 0 to 10 cm was gradually increased, while the three indexes were significantly decreased in the severe degradation period.Thus, the grass layer is the key factor affecting soil resistance to erosion,soil water and nutrient conservation in alpine meadow.%通过野外原位测定和室内分析相结合的方法,分析了不同退化程度对高寒草甸土壤理化特征及持水能力的影响.结果表明:(1)高寒草甸草毡层的退化消失显著降低了土壤抗蚀能力.从原生植被至中度退化阶段,高寒草甸土壤硬度和抗剪强度逐渐增加,至重度退化阶段二者急剧下降(P<0.05).(2)随着退化程度的加剧,高寒草甸土壤呈现贫瘠化.同时,随着土壤深度的增加,退化程度对土壤有机碳和全氮的影响作用逐步减弱.(3)退化程度对高寒草甸土壤持水能力的影响作用随深度的增加而降低,其对表层土壤持水能力的影响最为显著.从原生植被至中度退化阶段,0～10 cm土壤饱和持水量、毛管持水量及田间持水量呈增加趋势,至重度退化阶段,三者均显著降低.地表草毡层是保持高寒草甸土壤肥力、抗侵蚀能力和水源涵养功能的关键.

著录项

  • 来源
    《中国草地学报》 |2017年第5期|54-61|共8页
  • 作者

    杨永胜; 张莉; 未亚西; 李红琴; 李英年;

  • 作者单位

    中国科学院西北高原生物研究所生态中心,青海 西宁 810001;

    中国科学院高原生物适应与进化重点实验室,青海 西宁 810001;

    青海省生态环境遥感监测中心遥感室,青海 西宁 810000;

    中国科学院西北高原生物研究所生态中心,青海 西宁 810001;

    中国科学院大学,北京 100049;

    中国科学院西北高原生物研究所生态中心,青海 西宁 810001;

    中国科学院高原生物适应与进化重点实验室,青海 西宁 810001;

    中国科学院西北高原生物研究所生态中心,青海 西宁 810001;

    中国科学院高原生物适应与进化重点实验室,青海 西宁 810001;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 草地学、草原学;
  • 关键词

    退化程度; 高寒草甸; 土壤抗剪强度/硬度; 土壤养分; 土壤持水;

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