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为了促进湿地松中龄林的生长,以湘北9年生湿地松为研究对象,研究了配方肥不同施肥量对湿地松生长、土壤的影响及成本效益。施肥后3年的结果表明:不同施肥处理的胸径、树高、单株材积、林分蓄积生长量及施肥效益均不同程度高于对照,以700 g/株对湿地松生长的促进作用最大:施肥后2年的土壤养分比施肥前有所改善,不同土层土壤pH值降低,有机质、速效K含量均有所提高,速效N含量大幅提高,上层增加量高于下层,速效P不同程度减小,上层减少量低于下层:适量施肥可促进豆马勃菌的生长,施肥后7个月,豆马勃子实体个数在100~800 g/株范围内总体随施肥量的增加而增加。对湿地松中龄林进行1次追肥,能提高单位面积产量和效益,以N、P、K配方肥700 g/株最佳。
In order to promote the growth of Pinus elliottii forest, the 9-year-old Pinus elliottii was used as the research object to study the effects of different fertilizers on growth, soil and cost-effectiveness of Pinus elliottii. The results of three years after fertilization showed that the DBH, tree height, single plant volume, stand volume growth and fertilizer efficiency of different fertilization treatments were all higher than those of the control. The promotion effect of 700 g / The soil nutrients in the two years after fertilization were improved compared with those before fertilization. The pH value of soil in different soil layers decreased, the content of organic matter and available K increased, the content of available N increased significantly, the content of upper layer increased more than the lower layer, Small, the upper reduction was lower than the lower: Appropriate amount of fertilizer can promote the growth of bean spore Puffer bacteria, 7 months after fertilization, the number of Rubus sibiricus in the 100 ~ 800 g / plant range with the increase of the amount of fertilizer increased . One-time top dressing for slash pine could improve the yield and benefit per unit area, and the best fertilizer was N, P and K 700 g / plant.