马尾松采伐迹地炼山前后土壤养分变化的研究

Studies on the change of soil nutrient before and after controlled burning all cutting woodland of Pinus massoniana plantation

对炼山前后马尾松采伐迹地的土壤养分变化进行比较分析。结果表明 :炼山后表层 (0～ 2 0 cm)土壤 p H值、全磷、全钾、水解氮、速效磷、速效钾都有不同程度的提高 ,有机质、全氮量呈下降趋势 ,但底层 (2 0～ 40 cm)土壤的主要养分含量无明显变化。可见 ,炼山有利于提高土壤的速效养分含量 ,但由于炼山造林使林地枯枝落叶和养分库严重退化 ,不利于地力的长期维持。

The effects of cutting and burning off on soil nutrient under Pinus massoniana plantation were discussed.The results showed as follows.After controlled burning,pH,total P,total K,and available N,P,K, were increased in the 0~20 cm soil,but organic matter and total N of soil were at the contrary.Meanwhile those indexes in the 20~40 cm soil layer were not affected greatly by controlled burning.Therefore,using controlled burning to clear woodland for plan areas was favorable to increase the available soil nutrients,but it was unfavorable to keep soil fertilities for a long time due to severe degradation of soil organic matter and nutrient pool