果洛大武地区不同退化梯度下高寒草甸土壤养分特征变化

Characteristics Variation of Soil Nutrition in Different Degraded Degree Alpine Meadow in Dawu Region of Guoluo Prefecture

对果洛大武地区不同退化梯度下高寒草甸土壤养分特征变化进行了研究,结果表明:各退化梯度群落内土壤有机质,全氮,速效氮损失较大,平均流失率为46.7%,44.1%以及49.8%;全磷流失相对较少;速效磷含量的变化没有规律性,在轻度和中度退化草地中有较大幅度的损失,在重度退化草地中则明显升高。

The characteristics variation of soil nutrition in different degraded degree alpine meadow in Dawu Region of Guoluo Prefecture was studied.The results showed that the soil organic matter,total nitrogen and available nitrogen in different degraded degree alpine meadow had greater losses,the average loss rate of them was 46.7%,44.1% and 49.8%,respectively total phosphorus loss was relatively small,The Variation of available phosphorus contents was no regularity,and was relatively large in the lightly and moderately degraded grassland,but was significantly higher.in heavily degraded grassland.