Dead leaf turnover in monodominant forest of the marcescent palm Lodoicea maldivica.

IF 2.3 2区 环境科学与生态学 Q2 ECOLOGY
Peter J Edwards, Frauke Fleischer-Dogley
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Abstract

The palm Lodoicea maldivica is marcescent, with dead leaves remaining attached to the trunk for an extended period. To investigate how this trait affects the distribution and turnover of dead leaf material in Lodoicea forest, we measured dead leaf production and standing crops of dead leaves attached to palms (DM) and in the litter layer (DL); for comparison, we measured DL in stands of the non-marcescent species Martellidendron hornei and Deckenia nobilis. In a litterbag experiment, we investigated the decomposition of four types of leaf material: newly dead marcescent Lodoicea, old marcescent Lodoicea, and newly dead Deckenia and Martellidendron. Rates of decomposition were very slow and varied significantly amongst types (P < 0.001), with mean annual decomposition constants (k values) of 0.41, 0.37, 0.25 and 0.47 y-1 for new and old Lodoicea, Deckenia and Martellidendron, respectively. Decomposition rates also varied significantly with location in the forest (P < 0.001), apparently due to variable moisture conditions resulting from the funneling of water by Lodoicea leaves. Compared to other tropical forests, N and P concentrations in dead leaves of all species were very low, while total quantities of dead leaf material were extremely high (24.0, 22.3 and 16.7 t dry weight ha-1 for Lodoicea, Deckenia and Martellidendron, respectively). In the Lodoicea plot, marcescent leaves accounted for 46% (11.2 t dry weight ha-1) of all dead leaf material. We discuss the ecological significance of marcescence and its implications for management, especially in making Lodoicea forest vulnerable to fire.

粘质棕榈单优势林的枯叶更替。
棕榈Lodoicea maldivica是粘质的,枯叶附着在树干上很长一段时间。为了研究这一性状对林内枯叶物质的分布和周转的影响,我们测定了林内枯叶产量和枯叶附着在棕榈上(DM)和凋落物层(DL)的立地作物;为了进行比较,我们测量了非粘质物种马蹄莲(Martellidendron hornei)和德肯尼亚(Deckenia nobilis)林分的DL。在垃圾袋试验中,研究了新死的软质lodoicae、旧软质lodoicae、新死的Deckenia和Martellidendron四种叶片物质的分解情况。新老罗杜科、Deckenia和Martellidendron的分解速率非常慢,不同类型的分解速率差异显著(P -1)。不同地点的分解速率也有显著差异(Lodoicea、Deckenia和Martellidendron的分解速率分别为P -1)。在Lodoicea样地,粘质叶占所有死叶材料的46% (11.2 t干重ha-1)。我们讨论了粘结的生态意义及其对管理的影响,特别是在使Lodoicea森林易受火灾影响方面。
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来源期刊
Oecologia
Oecologia 环境科学-生态学
CiteScore
5.10
自引率
0.00%
发文量
192
审稿时长
5.3 months
期刊介绍: Oecologia publishes innovative ecological research of international interest. We seek reviews, advances in methodology, and original contributions, emphasizing the following areas: Population ecology, Plant-microbe-animal interactions, Ecosystem ecology, Community ecology, Global change ecology, Conservation ecology, Behavioral ecology and Physiological Ecology. In general, studies that are purely descriptive, mathematical, documentary, and/or natural history will not be considered.
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