植物生态学报 ›› 1989, Vol. 13 ›› Issue (1): 42-48.

• 论文 • 上一篇    下一篇

天然枫桦红松林凋落量动态及养分归还量

李景文,刘传照,任淑文,詹鸿振   

  • 发布日期:1989-01-10
  • 通讯作者: 李景文

Litter Dynamics and Its Return of Nutrients in Natural Birch-Korean Pine Forests

Li Jing-wen, Liu Chuan-zhao, Ren Shu-wen, Zhan Hong-zhen   

  • Published:1989-01-10
  • Contact: Jing Jia-hai

摘要: 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凋落高峰期(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。

Abstract: The mean annual litter in Birch-Korean Pine forests is 5.8 t/ha (dry weight) over a 3-year study period in the Lesser Xing anling mountains. The seasonal pattern of litter exhibits a distinct autumal peak as the weather grows cold (September to October). Return of the nutrients: Ca, N, K, Mg and P elements in the litterfall per year are 67.0, 56.9, 14.8, 9.5 and 6.6 kg/ha respectively, totaling 155.0kg/ha. Nutrient content in the deciduous leaf litter is obviously greater than that determined for all other coniferous leaf litters. In spite of the fact that the annual litter of deciduous trees only amounts to about 1/3 of the total in the mixed forest, the litter leaves of deciduous trees, however Still have a fairly large percentage (43.4) of nutrients returned to the soil. Therefore, retaining some deciduous trees in forest management with Korean Pine stands would be useful for improving soil fertility and promoting stand growth.