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拉脊山亚高寒草甸退化程度对土壤养分影响的研究
引用本文:赵殿智,徐志伟. 拉脊山亚高寒草甸退化程度对土壤养分影响的研究[J]. 四川草原, 2007, 0(10)
作者姓名:赵殿智  徐志伟
作者单位:青海省三角城种羊场 青海刚察812300(赵殿智),青海大学 青海西宁810016(徐志伟)
摘    要:对亚高寒草甸土壤因素的调查分析,结果表明:全氮和全钾含量随退化程度的加深而减小,依次是轻度退化、中度退化和极度退化。随着草地退化程度的加剧,地上、地下生物量以及土壤全氮、全钾的含量也随之下降。不同退化程度间土壤全磷含量变化不明显,各层次之间虽然有上升趋势,但变化较小。全磷在土壤剖面中分布较均匀,说明退化强度对高山草甸草原土土壤全磷的影响相对较小。高寒草甸生态系统的恶化,不仅使群落物种组成发生了巨大变化,而且导致物种多样性发生改变,这与过度放牧和环境因子的影响程度有着密切的关系。

关 键 词:土壤因素  退化程度  土壤养分影响

Research on the Effect of Degradation Degree of Subalpine Meadow on Soil Nutrient in Laji Mountain Area
ZHAO Dian-zhi,XU Zhi-wei. Research on the Effect of Degradation Degree of Subalpine Meadow on Soil Nutrient in Laji Mountain Area[J]. Journal of Sichuan Grassland, 2007, 0(10)
Authors:ZHAO Dian-zhi  XU Zhi-wei
Affiliation:ZHAO Dian-zhi1,XU Zhi-wei2
Abstract:After investigation and analysis of soil factors of subalpine meadow,the results showed that the content of total N and K decrease with the degradation of grassland,ordered by light degraded meadow,medium degraded meadow,heavily degraded meadow.The aboveground and underground biomass,and total N,total K content decrease with the degradation of grassland.The content of total P in different degradation degrees had no significant change,although there was an ascending tendency,the change was little.Total P distribution in soil section was homogeneous,which indicated that degradation degree had less effect on the total P in soil of subalpine meadow.The deterioration of alpine meadow ecosystem not only changed the species composition a lot,but also made the species diversity changed,which had a close relationship with overgrazing and environmental factors.
Keywords:Soil factor  Subalpine meadow  Effect of soil nutrient
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