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Journal of Ecology:浙江大学于明坚研究组发表植物生理研究论文

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摘要 : 2017年12月12日,国际期刊《Journal of Ecology》杂志在线发表了浙江大学生命科学学院生态所于明坚教授的一篇研究论文,研究报道了常绿阔叶林叶片寿命与资源利用关联关系。

2017年12月12日,国际期刊《Journal of Ecology》杂志在线发表了浙江大学生命科学学院生态所于明坚教授的一篇研究论文,研究报道了常绿阔叶林叶片寿命与资源利用关联关系。金毅博士后为第一作者,于明坚教授为通讯作者。

常绿阔叶林是世界上亚热带地区的地带性植被,并集中分布于我国。常绿和落叶阔叶植物是构成该类型森林的两个主要类群。这两个类群为何能够在亚热带(尤其是分布面积最大的、常绿阔叶林最为典型的中亚热带)常绿阔叶林内共存?以往很多研究认为主要是因为两者对于地形的偏好不同,各自通过占据其有利地形而使得其种群得以更新和延续。但是,野外观察常发现两者同时出现在同种地形中,以往研究并不能解释这一格局。另一方面,近期研究发现叶片寿命与植物的资源利用策略存在关联,而常绿和落叶阔叶植物的叶片寿命有差异,故两者对于资源(如光照)的偏好也应不同。

为此,本研究在古田山国家级自然保护区24公顷中亚热带常绿阔叶林动态监测样地内,选择2008年特大冰雪灾害导致树木大量死亡或受损而形成的32个不同面积林窗及其周围林下(光照不同),分布在山脊和山谷(各16个,地形不同),跟踪监测了常绿和落叶阔叶植物幼苗存活、生长及补员动态,发现光照对于两者共存的促进作用比地形更大,并且其中优势度占劣势的落叶阔叶植物依赖于在林窗内更新。本研究拓宽并加深了常绿和落叶阔叶植物在常绿阔叶林内共存机制的认识,为亚热带森林生态系统管理提供了科学依据。

原文链接:

Effects of light and topography on reGENEration and coexistence of evergreen and deciduous tree species in a Chinese subtropical forest

原文摘要:

1.Evergreen broad-leaved forests are widely distributed in eastern Asia with evergreen (EBL) and deciduous (DBL) broad-leaved tree species coexisting under the same climatic regime, raising questions as to the underlying mechanisms. Since EBL and DBL species differ in leaf Lifespan, a key component of resource economic strategies, their coexistence might be attributed to regeneration niche partitioning across habitats varying in resource supply.

2.We investigated the effects of variation in insolation and topography on regeneration of EBL and DBL species in a subtropical evergreen broad-leaved forest of eastern China after an ICE storm that caused severe canopy disturbance.

3.Using a mixed-effects modeling framework and census data from 2011 to 2014 on 8548 wild seedlings of 123 species, we quantified habitat preferences of EBL and DBL species during post-disturbance regeneration and how their survival and height relative growth rates varied among habitats.

4.The relative density of DBL seedlings (proportional to all seedlings) was greater in habitats with greater (canopy gaps) compared to lesser (understory) insolation and increased with canopy gap size. However, DBL seedlings were not more frequent in higher (valleys) compared to lower (ridges) fertility habitats. Although DBL seedlings exhibited larger differences in growth between higher and lower resource habitats than EBL seedlings, their growth rates did not increase with canopy gap size. Seedlings of EBL species had high survival in all habitats, but larger DBL seedlings survived equally well on ridges. Consequently, the relative density of DBL seedlings declined in valleys, so that by 2014 it became more similar in valley and ridge habitats, whereas it remained higher in gaps than in the understory, and especially in larger gaps.

5.Synthesis. Specialization on contrasting topographic habitats is considered the primary mechanism mediating coexistence between DBL and EBL species. Our results, however, suggest this may not always be true, since seedlings of DBL and EBL species partitioned regeneration niches based on light more so than topography. We propose that coexistence of DBL and EBL species can strongly depend upon canopy disturbance to create a mosaic of habitat patches, including high light gaps favoring regeneration of DBL species.

DOI:10.1111/1365-2745.12911

作者:于明坚 点击:

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