西藏色季拉山暗针叶林苔藓多样性及林窗干扰的影响

Effects of Bryophytes Diversity and Gap in a Dark Coniferous Forest in Xizang Sygera Mountain

摘要:

为了解西藏色季拉山暗针叶林苔藓多样性及林窗干扰的影响，在过去工作积累的基础上研究了色季拉山西坡5块样地内不同林内环境(林窗、林缘和林下)地面、腐木和树附生苔藓生物量特征。结果表明, 地面生单位面积苔藓植物生物量储量最高，平均910.10 g/m²，其次为腐木生(221.90 g/m²)，树附生的最低(53.59 g/m²)。林窗地面生苔藓单位面积生物量最高，均值为360.47 g/m²，其次为林下(305.51 g/m²)，最小为林缘(244.11 g/m²)；林窗、林缘和林下间的地面生苔藓单位面积生物量差异显著(P＜0.05)。沿海拔梯度，林窗苔藓单位面积生物量表现出先增加后减少的趋势。因此，在西藏色季拉山暗针叶林内，林窗对地面生苔藓单位面积生物量有显著影响。

Abstract:

In order to understand the diversity of bryophytes and their response to gap disturbance in dark coniferous forests in Xizang Sygera Mountain, the biomass characteristics of epiphytic bryophytes on the ground, rotting wood and tree in different habitats (forest gap, forest edge, understory) were studied in five plots of western slope in Xizang Sygera Mountains. The results showed that the biomass per unit area of ground bryophytes were the highest with an average of 910.10 g/m², followed by saprophytic bryophytes (221.90 g/m²) and epiphytes (53.59 g/m²). The biomass per unit area of ground moss in the forest gap was the highest with an average of 360.47 g/m², followed by understory (305.51 g/m²), and forest edge (244.11 g/m²). There was a significant difference in the biomass per unit area among three habitats (P＜0.05). Along altitude gradients, the biomass per unit area of bryophytes grown in forest gap increased at first and then decreased. Therefore, it was suggested that the forest gap had a significant effect on the biomass per unit area of ground moss in dark coniferous forest in Xizang Sygera Mountain.