山地草甸退化对土壤速效养分的影响

以江西省武功山草甸为研究对象,分析不同海拔高度(1 600~1 900m)和不同土层(0~20cm和20~40cm)的草甸土壤有机质、p H值和速效养分对草甸退化的响应。结果表明:(1)在武功山草甸区各个海拔,草甸退化均使土壤有机质和速效养分含量有所下降,并且对表层土的影响要大于深层土。(2)草甸退化使得碱解氮和速效磷间的相关性减弱,速效钾和碱解氮、有效磷之间的相关性加强,土壤p H值与碱解氮之间由不显著相关变为极显著负相关(R=-0.637,P0.01)。

Effects of Alpine Meadow Degradation on Soil Available Nutrient

This research takes meadow of the Wugong Mountain in Jiangxi Province, China as research object, and analyzes the influence of meadow degradation on soil organic matter, pH and available nutrients at different altitudes(1 600-1 900 m)and different soil layers(0-20 cm and 20-40 cm). Results show that (1)at each altitude of the meadow of the Wugong Mountain, meadow degradation made the contents of organic matter and available nutrients decrease, and the effect of surface soil was greater than that of deep soil; and (2)the meadow degradation made the correlation between hydrolysable nitrogen and available phosphorus reduced, but the correlation between available potassium, hydrolysable nitrogen and available phosphorous enhanced, and made the correlation between pH and hydrolysable nitrogen in soil from no significance to very high significance(R=-0.637, P<0.01).