论文部分内容阅读
研究了马尾松次生林在轻度、中度、强度和无火干扰情况下林地土壤化学性质5年内的动态变化规律。结果表明:除有机质以外,火干扰对土壤pH值、土壤CEC、全N、碱解N、全P、全K和速效K的影响持续期不长,大多在两年左右恢复到火烧前的水平;随着火干扰强度的增大,土壤有机质损失越大,全P含量下降,速效P升高;火干扰强度对Ⅰ层有机质、速效P含量和Ⅱ层速效P含量的影响极显著(P<0.05),不同时间点Ⅰ层有机质和Ⅱ层速效P含量随火干扰影响的趋势有明显的差异(P<0.05),分别拟合了轻度火干扰、中度火干扰和强度火干扰下有机质和速效P含量随时间变化趋势模型。
The dynamics of soil chemical properties of Pinus massoniana secondary forest under mild, moderate, intense and no-fire disturbance was studied in five years. The results showed that the effects of fire disturbance on soil pH, soil CEC, total N, total alkalinity N, total P, total K and available K did not last long except for organic matter, and mostly returned to the level before burning in two years ; With the increase of fire disturbance intensity, the loss of organic matter in soil increased, the content of total P decreased, and the available P increased. The effect of fire disturbance on the content of organic matter, available P, and available P in layer I was significant (P <0.05 ), There was a significant difference (P <0.05) between the content of available P and the content of available P in layer Ⅰ and layer Ⅱ at different time points (P <0.05). The contents of organic matter and organic matter under mild and moderate fire disturbance Available P content with time trend model.