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

发布时间：2018-04-30 01:06

本文选题：退化程度 + 高寒草甸　；参考：《中国草地学报》2017年05期

【摘要】：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(P0.05)。(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,0~10cm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。
[Abstract]:The effects of degradation degree on soil physical and chemical characteristics and water holding capacity of alpine meadow were analyzed by means of field in situ measurement and laboratory analysis. The results showed that the degradation of the felted layer of alpine meadow significantly reduced the soil corrosion resistance. From primary vegetation to moderate degradation stage, soil hardness and shear strength of alpine meadow increased gradually, and decreased sharply to severe degradation stage (P0.05. 2) with the increase of degradation degree, alpine meadow soil became barren. At the same time, with the increase of soil depth, the effect of degradation degree on soil organic carbon and total nitrogen gradually weakened.) the effect of degradation degree on soil water holding capacity of alpine meadow decreased with the increase of soil depth. It has the most significant effect on the water holding capacity of surface soil. From the primary vegetation stage to the moderate degradation stage, the saturated water holding capacity of 10cm soil, capillary water holding capacity and field water holding capacity increased, and decreased significantly to the severe degradation stage. The surface grass felt is the key to maintain the soil fertility, erosion resistance and water conservation function of alpine meadow.
【作者单位】：中国科学院西北高原生物研究所生态中心;中国科学院高原生物适应与进化重点实验室;青海省生态环境遥感监测中心遥感室;中国科学院大学;
【基金】：青海省青年基金(2016-ZJ-943Q) 中科院战略先导专项(XDB03030502) 国家重点研发计划项目(2016YFC0501802)
【分类号】：S812.2

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