特大冰冻灾害后大明山常绿阔叶林结构及物种多样性动态
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广西大学林学院,广西大学林学院,亚热带农业生物资源保护与利用国家重点实验室,广西大学林学院,广西大学林学院,广西大学林学院

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国家自然科学基金资助项目(30860059)


The dynamics of the structure and plant species diversity of evergreen broadleaved forests in Damingshan National Nature Reserve after a severe ice storm damage in 2008, China
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Forestry College, Guangxi University,,State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources,,,

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    摘要:

    2008年1月,在我国南方发生了百年一遇的特大冰冻灾害,有19个省区和1765万hm2森林受灾。虽然此种规模的干扰相对稀少,但它为研究冰冻干扰对亚热带森林生态系统的组成、结构和演替的短期和长期影响提供了一次绝好的机会。在大明山国家级自然保护区中山区,建立了3.2hm2的固定样地,包含80个20m×20m样方,分别于2009年和2010年对样方内胸径≥1cm的木本植物的胸径进行测定,将受损林木分为折干、翻蔸和死亡3类,同时测定每个样方的冠层结构。结果表明:2008年的特大冰冻灾害对大明山常绿阔叶林造成严重影响,2009年胸径≥1cm的木本植物受灾率达51.8%;2010年死亡的个体数达776株,是2009年的6.75倍;个体较小的林木(胸径为2-6cm以下)比个体较大的林木受损更严重,其折干、翻蔸和死亡的个体数分别占2010年折干、翻蔸和死亡个体总数的68.18%、54.29%和83.51%;常绿阔叶林林冠有很强的恢复能力,2010年森林的叶面积指数比2009年提高55.4%;2010年森林群落的个体数、物种丰富度、Shannon-Wiener指数、Simpson指数显著增加 (P=0.018-0.000, df=79),分别比2009年提高14.96%、10.05%、3.89%和1.13%;群落优势种(云贵山茉莉、罗浮槭)个体的大量死亡将影响着群落的稳定性。

    Abstract:

    A damaging ice storm struck southern China in January 2008, affecting 19 provinces of China and nearly 17.65 million hm2 of forests. Although disturbance of this scale occurred rarely (once in a century), it provided a unique opportunity to study short- and long-term impacts on the compositions, structure and succession of forest ecosystem. A 3.2 hm2 plot was set up in the ice storm-damaged montane evergreen broad-leaved forest in Damingshan National Nature Reserve. The plot was divided into 80 subplots, each of 400m2. Within each subplot, all trees (diameter at breast height or DBH≥1.0cm) were identified, mapped and tagged at breast height (1.3 m from the base) with pre-numbered aluminum tags, and the DBH and stem heights of these taged trees was measured. In addition, the LAI of the plots were determined. We assigned each ice-damaged tree one of the following three damage categories: main stem broken, tree uprooted, or dead. We carried out surveys in 2009 and 2010. The evergreen broad-leaved forest of Damingshan National Nature Reserve were affected severely by the ice storm as the damaged trees accounted for 51.8% of the total individuals with DBH≥1.0cm in 2009. There were 776 dead trees in 2010, 6.75 times of that in 2009. In particular, small trees (DBH 2-6cm) were more damaged more severely than big ones, accounting for 68.18%, 54.29%, and 83.51% of the total broken main stems, the total uprooted and the total dead trees, respectively. Resilience of canopy cover to the disturbance was great, as indicated by 55.4% increase in LAI of the forest from 2009 to2010. Furthermore, species abundance, richness, Shannon-Wiener index and Simpson index of the community had increased 14.96%、10.05%、3.89% and 1.13%, respectively, from 2009 to 2010. These changes were statistically significantly (P=0.018-0.000, df=79). However, the mortality of large trees of dominant canopy species (Huodendron biaristatum, and Acer fabric) will affect the community stability.

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朱宏光,李燕群,温远光,梁宏温,林建勇,农友.特大冰冻灾害后大明山常绿阔叶林结构及物种多样性动态.生态学报,2011,31(19):5571~5577

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