【作者】 罗杰；

【导师】 郑维列；

【作者基本信息】 西藏大学 ， 森林培育， 2010， 硕士

【摘要】 本研究以西藏色季拉山的方枝柏纯林、急尖长苞冷杉纯林和方枝柏急尖长苞冷杉混交林为研究对象,通过研究其林型下长鞭红景天和优势种的更新,了解长鞭红景天在不同林型下的更新情况以及各林型下优势种的更新特征,为长鞭红景天的科学保护和西藏色季拉山原始森林的可持续经营提供理论依据。通过研究方枝柏林群落、急尖长苞冷杉林群落和方枝柏冷杉群落三个群落下的长鞭红景天的种群扩张能力和群落内方枝柏、急尖长苞冷杉的更新,揭示长鞭红景天的种群扩张对方枝柏和急尖长苞冷杉更新的影响,论证其群落的稳定性。研究结果表明:1.长鞭红景天的更新情况,在阳坡生境更新良好。而在阴坡生境的林型下草本层中,长鞭红景天不是优势种,不能得到很好的更新。2.混交林中,方枝柏更新株数量极少,为衰退型种群,而急尖长苞冷杉更新株数量充足,表现出增长型种群的结构特征;急尖长苞冷杉纯林中急尖长苞冷杉更新株数量充足,表现为增长型种群;方枝柏纯林中方枝柏更新株数量较充足,表现为稳定型种群。3.急尖长苞冷杉纯林内物种多样性低,由于急尖长苞冷杉的强大的优势,使其它的灌木逐渐减少和消亡,林分的结构逐渐趋于单一,杜鹃占据了除急尖长苞冷杉外的绝大多数的空间。4.色季拉山调查样地周围的植物从生物学特性分,主要以阳性物种为主。这些物种喜光性强,对光照有较大需求。更多还原

【Abstract】 Sabina saltuaria pure forest, Abies georgei var. smithii pure forest and mixed forest of Sabina saltuaria and Abies georgei var. smithii in Tibet Sejila Mountain were studied. Regeneration of Rhodiola fastigiata and dominant species in different forest type were explored to understand the regeneration status of Rhodiola fastigiata and regeneration characteristics of dominant species. A theoretical basis was provided for the Rhodiola fastigiata conservation and sustainable management of virgin forests in Sejila Mountain.By studying Sabina saltuaria regeneration, Abies georgei var. smithii regeneration and population expansions of Rhodiola fastigiata Sabina saltuaria pure forest, Abies georgei var. smithii pure forest and mixed forest of Sabina saltuaria and Abies georgei var. smithii. Population expansion of Rhodiola fastigiata was explored to understand the compliance on Sabina saltuaria regeneration and Abies georgei var. smithii regeneration to demonstrate the stability of their community.The results show that:1. Rhodiola fastigiata regeneration is better in sunny slope than in shady slope. Rhodiola fastigiata which was not dominant regeneration can not be good.2. Sabina saltuaria regeneration which was very few belonged to recession population while Abies georgei var. smithii regeneration which was sufficient belonged to growth population in mixed forest of Sabina saltuaria and Abies georgei var. smithii. Abies georgei var. smithii regeneration which was sufficient belonged to growth population in Abies georgei var. smithii pure forest. Sabina saltuaria regeneration which was sufficient belonged to stable population in Sabina saltuaria pure forest.3. The species diversity is low in Abies georgei var. smithii pure forest. As a strong advantage of Abies georgei var. smithii, other shrubs gradually decreased and died. Stand structure becoming more and more single. Rhododendron occupied the most space excluding which Abies georgei var. smithii occupied. 4. Plants of sample sites and the surrounding in Sejila Mountain according to biological characteristics mainly positive species. These species were strongly heliophilous while there was a greater demand on the light.更多还原