灼烧对保护地土壤化学性质的影响

Effects of burning on the chemical properties of soil in protective ground

研究了不同灼烧温度下保护地土壤化学性质的变化．结果表明，随着灼烧温度的增加，土壤pH值大体呈上升趋势，渐近于中性；土壤全氮含量逐渐减少；土壤全磷含量变化较小；土壤全钾含量在低温灼烧阶段有轻微波动，但不同灼烧温度下全钾含量的方差分析差异不显著；土壤中碱解氮、速效磷、速效钾的含量在灼烧温度为100～200℃时变化不大，当灼烧温度大于300℃时土壤碱解氮和速效磷的含量均逐渐减少，土壤中速效钾的含量逐渐上升，超过600℃时有所下降．

The changes of chemistry properties of soil in protective ground under different burning temperatures were studied, which showed that the soil pH value raised generally along with the increasing temperature and tended neutrality; the contents of total N decreased gradually; total P had less changes;total K had light undulation under low burning temperature, but the differences under different temperatures were not significant; the content of hydrolysis N, available P, and available K were stable at 100-200℃. The hydrolysis N and available P decreased when the burning temperature was over 300 ℃, but the available K increased, and decreased when the burning temperature was over 600℃.