地盘松是云南松的一个灌木状变种,常生长在土壤贫瘠干旱地段,是易发生林火的群落之一.2016年5月6-10日,对昆明市西山区团结街道办事处棋台社区利者村后山地盘松火烧林地阴坡、 阳坡和坡顶3种立地条件进行了初步调查,以掌握其自然更新能力.结果表明,在样地火烧前,不同立地之间地盘松原植株的枝条数和株丛数存在显著差异(P<0.05);火烧对地盘松原植株损害严重;由于具有萌生能力和植冠种子库,火烧后地盘松通过萌生与实生2种途径进行恢复,并且更新植株的株丛数和枝条数均高于原植株,其中坡顶更新植株的株丛数和枝条数均显著高于原植株(P<0.05);火烧后地盘松萌生枝的长势明显优于实生苗,萌生枝的高生长量和地径均大于实生苗.地盘松群落过火时都为林冠火,地上部分甚至全株死亡.过火地段可通过萌生和实生更新很快自然恢复.%Pinus yunnanensis var. pygmaea, a shrub-like variety of P. yunnanensis and one of the communities prone to fire, usually grows in arid areas. From May 6th to 10th, 2016, in order to master its capacity of natural regeneration, a preliminary investigation carried out on three conditions ( north-facing slope, south-facing slope and slope-top) where Pinus yunnanensis var. pygmaea was burned in Lizhe Village, Qitai Community, Tuanjie Street Office of Xishan District, Kunming City. The results showed that before the fire, the number of branch and individual plants of Pinus yunnanensis var. pygmaea had significant difference in different slopes (P<0. 05); Fire caused serious harm to Pinus yunnanensis var. pygmaea; Because of the ability of sprouting and canopy seed bank, Pinus yunnanensis var. pygmaea got recovered through two ways including sprouting and seeding after fire. The branch number and the number of individual plants of regenerative plants were higher than original plants, the branch number and the number of individual plants of regenerative plants were significantly higher than original plants on the top of the slope (P<0. 05); The growth of the sprouts of Pinus yunnanensis var. pygmaea was signifi-cantly better than the seedlings after fire, and the height and ground diameter of the sprouts were higher than the seedlings. If fire occurs in community, it is the crown-fire, and over-ground part of the plants or even all of the plants will die. In the burnt areas, the Pinus yunnanensis var. pygmaea community recovers soon through sprouting and seeding.
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