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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 被引量:6

Research on the Effect of Degradation Degree of Subalpine Meadow on Soil Nutrient in Laji Mountain Area
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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。 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 ecosystem not only changed the species composition a lot, but also made the meadow. The deterioration of alpine meadow species diversity changed, which had a close relationship with overgrazing and environmental factors.
出处 《草业与畜牧》 2007年第10期4-7,共4页 Pruataculture & Animal Husbandry
关键词 土壤因素 退化程度 土壤养分影响 Soil factor Subalpine meadow Effect of soil nutrient
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