林分密度对马尾松人工林林地土化性质的影响

目的]研究了不同密度马尾松人工林林地土壤化学性质的变化,为马尾松人工林最佳栽培模式选择提供参考。方法]采用取样分析方法,比较不同密度对林地土壤N、P、K和盐基总量的影响。结果]随着土层加深,除pH值和全K外,各密度马尾松人工林林地土壤养分含量呈明显的下降趋势。其中,土壤表层(0～20 cm)中的有机质、全N、全P、速效N及速效P随着林分密度增加呈先上升后下降的趋势,且各指标峰值均出现在3 333株/hm2密度。结论]马尾松人工林林分密度与地力有着密切的相关关系,且4个密度中以3 333株/hm2密度最利于马尾松人工林林地土壤养分的循环累积。

Effect of the Density of Masson Pine on the Chemical Nature of the Land of Its Artificial Plantation

Objective] The reference for the best cultivation mode of Masson pine(Pinus massoniana L.) plantation was provided through the research on the variation of the chemical property of the soil of Masson pine plantation under the different densities.Method] The effect of the different densities of Masson pine on N,P,K and the sum of base in soil was compared based on the analysis of sample.Results] With the increment of soil depth,the content of the nutrient,except for pH and total K,showed a downward trend in the different densities of the pine plantation,among which,the content of organic matter,total N,total P,available N and available P was firstly increased was increased and then decreased in the surface layer of soil(0-20 cm) and the peak value of each index appeared at the planting density of 3 333 plants/hm2.Conclusion] The stand density of Masson pine plantation had a close relationship with the fertility and the density of 3 333 plants/hm2 was the most conducive to the cycle accumulation of nutrient in the soil of pine plantation among 4 different densities.