首页> 外文期刊>Forest Ecology and Management >Regeneration, recovery and succession of a Pinus yunnanensis community five years after a mega-fire in central Yunnan, China.
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Regeneration, recovery and succession of a Pinus yunnanensis community five years after a mega-fire in central Yunnan, China.

机译:中国云南中部特大火灾发生五年后,云南松社区的更新,恢复和演替。

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Central Yunnan, China was once dominated by evergreen broad-leaved forests. After a long period of destructive exploitation including agriculture development, overlogging for timber and cutting for fuelwood, these forests are being allowed to reestablish themselves. A large area is now dominated by the conifer Pinus yunnanensis forest which has naturally regenerated and represents an early intermediate stage in the reestablishment of the evergreen broad-leaved forest. In 2006, a mega-fire burned approximately 18.49 km2 of this forest. The Pinus is growing back. To examine the process of regeneration dynamics and recovery of the Pinus community after the mega-fire, we investigated plant communities in burned and unburned areas, including a P. yunnanensis shrubland regenerated after the fire, a P. yunnanensis forest without fire occurrence, a P. yunnanensis and Lithocarpus mairei mixed forest, and a Castanopsis orthacantha and Lithocarpus dealbatus evergreen broad-leaved forest, as well as a plantation of P. yunnanensis. Abundant seedlings and saplings of P. yunnanensis and some light-demanding deciduous and evergreen broad-leaved tree species were found in the Pinus shrubland five years after the fire. The frequency distribution by height-classes after the fire was of an inverse-J type, representing very good regeneration. We used space-for-time substitution to obtain an understanding of the directions and pathways of the succession. The approximate successional trend in the area was from the Pinus shrubland to the Pinus forest, then to the mixed coniferous and evergreen broad-leaved Pinus-Lithocarpus forest, then to the evergreen broad-leaved Castanopsis-Lithocarpus forest. In the early successional stage, the floristic richness and species diversity of the Pinus shrubland had lower values as compared to those in the middle and late successional stages, but much higher than those of the Pinus plantation. Our results indicate that the natural recovery of P. yunnanensis after the fire was more efficient than that of a man-made forest of the same species. Nature's process outpaced human intervention.Digital Object Identifier http://dx.doi.org/10.1016/j.foreco.2012.07.019
机译:中国云南中部曾经是常绿阔叶林。经过长期的破坏性开发,包括农业发展,伐木滥伐和薪柴砍伐,这些森林得以重建。现在,大面积的针叶树为云南松林森林的自然再生,代表着常绿阔叶林重建的早期中间阶段。 2006年,一场大火燃烧了大约18.49 km 2 。松树重新生长。为了研究大火后松树群落的更新动态和恢复过程,我们调查了烧毁和未烧毁地区的植物群落,包括火灾后再生的云南松灌木林,未发生火灾的云南松林,云南云杉和玛氏石楠混交林,欧洲锥栗和欧洲石楠常绿阔叶林以及云南人工林。火灾发生五年后,在松林灌木丛中发现了云南松的丰富幼苗和幼树,以及一些需要光的落叶和常绿阔叶树种。火灾后,按高度分类的频率分布为反J型,表示非常好的再生。我们使用时空替换来了解继承的方向和途径。该地区的大致演替趋势是:从松林灌木林到松林,再到针叶树和常绿阔叶松-石竹林,再到常绿阔叶栗-石竹林。在演替初期,与中,演替后期相比,松树灌丛的植物丰富度和物种多样性较低,但远高于松树人工林。我们的结果表明,大火后云南松的自然恢复比同种人工林的恢复更为有效。大自然的过程超过了人类的干预。数字对象标识符http://dx.doi.org/10.1016/j.foreco.2012.07.019

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