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三年定位研究表明小兴安岭天然枫桦红松林年均凋落量有5.8t/ha(干重)。凋落量的季节变化格局是随着气候变冷有一明显秋季调落高峰期(9-10月)。凋落物每年养分的归还量:Ca、N、K、Mg、P,相应为67.0、56.9、14.8、9.5、和6.6kg/ha,总计155.0kg/ha。据测定阔叶树落叶养分含量明显高于所有针叶的含量。尽管阔叶树的年凋落量仅占该混交林的年总凋落量的三分之一,阔叶树落叶仍有相当高的养分比例(43.4%)归还土壤。因此,红松林分的经营管理中,保留适当比重的阔叶树有利于土壤改良和促进林分生长。
The three-year positioning study showed that the annual average litterfall of Pinus koreanum stands is 5.8t / ha (dry weight) in Xiaoxing’anling. The seasonal pattern of litterfall is a clear fall season (September-October) with climatic cooling. The annual nutrient return of litter: Ca, N, K, Mg, P, corresponding to 67.0, 56.9, 14.8, 9.5 and 6.6 kg / ha for a total of 155.0 kg ha. According to the determination of deciduous broad-leaved leaf nutrient content was significantly higher than all coniferous content. Although the annual litterfall of broad-leaved trees accounted for only one-third of the total annual litterfall in the mixed forest, the deciduous broad-leaved deciduous tree still had a relatively high proportion of nutrients (43.4%) returned to the soil. Therefore, keeping the proper proportion of broad-leaved trees in the management of the Korean pine forest is conducive to soil improvement and forest stand growth.