Climate influence seed production in managed and unmanaged Nothofagus pumilio forests of Southern Patagonia

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-07-24 DOI:10.33494/nzjfs542024x295x

Julián Rodríguez-Souilla, J. M. Cellini, F. Roig, María Vanessa Lencinas, J. Chaves, P. L. Peri, G. M. Martínez Pastur

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引用次数: 0

Abstract

Background: Annual seed production is key to understand natural forest dynamics and to apply sustainable forest management. This process is subjected to variations according to annual and seasonal climatic conditions, locally affected by El Niño-Southern Oscillation (ENSO) and the Southern Annular Mode (SAM) seasonality. Recognising how these variables affect the dynamics of harvested forests is useful for developing forest management strategies. Therefore, the objective of this study was to analyse annual seed production (SP) in Nothofagus pumilio (Poepp. & Endl.) Krasser stands harvested under variable retention and unmanaged primary forests in Tierra del Fuego, Argentina, related to the occurrence of climatic events over a 17-year period (2006-2022). Methods: Seed production (million ha-1 year-1) was annually measured in three managed stands with different retention levels (AR: aggregates; DRI: dispersed with aggregate protection; DR: dispersed without aggregate protection) and three primary forests (PF) stands as control sites (4 treatments x 3 areas x 6 replicates x 17 years). Values of occurrences of climatic events (positive or negative values of ENSO and SAM) were related to monthly temperature and rainfall. ANOVAs, correlation analyses and statistical modelling were performed to predict SP based on climatic variables and forest treatments. Results: Seed production varied over years and among forest treatments depending on annual climate variations, with annual averages for the studied period of: 9.35 million ha-1 year-1 for PF, 7.16 million ha-1 year-1 for AR, 2.25 million ha-1 year-1 for DRI and 1.08 million ha-1 year-1 for DR. ENSO+ and SAM+ acted as a trigger of high SP, associated to higher temperatures and dry conditions, mainly during spring and summer. The models predicted SP explaining 73-85% of its variability, considering minimum and maximum temperatures and ENSO mean values as better predictors. Conclusions: Findings presented in this study have important implications for forest management as a tool for understanding forest dynamics related to seeding, a key factor for forest regeneration in a context of high climate variability. However, within a context of climate change with extreme events, there is a need for long-term monitoring of seeding processes in Nothofagus forests.

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气候对巴塔哥尼亚南部有管理和无管理 Nothofagus pumilio 森林种子生产的影响

背景：每年的种子生产是了解自然森林动态和实施可持续森林管理的关键。这一过程受年度和季节性气候条件的影响而变化，局部地区受厄尔尼诺-南方涛动（ENSO）和南环模式（SAM）季节性的影响。了解这些变量如何影响采伐森林的动态变化有助于制定森林管理策略。因此，本研究的目的是分析阿根廷火地岛在可变保留率条件下采伐的 Nothofagus pumilio (Poepp. & Endl.) Krasser 林分的种子年产量（SP）与 17 年间（2006-2022 年）气候事件发生的关系：方法：每年在三个不同保留水平的管理林分（AR：聚合；DRI：有聚合保护的分散；DR：无聚合保护的分散）和三个原始森林（PF）林分（4 个处理 x 3 个区域 x 6 个重复 x 17 年）中测量种子产量（百万公顷-1 年-1）。气候事件发生值（厄尔尼诺/南方涛动和 SAM 的正值或负值）与月气温和降雨量相关。通过方差分析、相关性分析和统计建模来预测基于气候变量和森林处理的种子产量：种子产量随年份和森林处理的不同而变化，这取决于年度气候的变化：PF为935万公顷/年，AR为716万公顷/年，DRI为225万公顷/年，DR为108万公顷/年。厄尔尼诺/南方涛动+和萨米+是高 SP 的触发因素，与较高的温度和干燥条件有关，主要发生在春季和夏季。模型对 SP 的预测解释了其 73-85% 的变化，认为最低和最高温度以及厄尔尼诺/南方涛动平均值是更好的预测因素：本研究的结果对森林管理具有重要意义，因为它是了解与播种有关的森林动态的工具，而播种是气候多变背景下森林再生的关键因素。然而，在极端事件频发的气候变化背景下，有必要对Nothofagus森林的播种过程进行长期监测。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.