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Drought effects on carbon dynamics of trees in a secondary Atlantic Forest
Forest Ecology and Management ( IF 3.7 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.foreco.2020.118097
Samuel José Silva Soares da Rocha , Carlos Moreira Miquelino Eleto Torres , Paulo Henrique Villanova , Bruno Leão Said Schettini , Laércio Antônio Gonçalves Jacovine , Helio Garcia Leite , Eduardo Monteiro Gelcer , Leonardo Pequeno Reis , Karina Milagres Neves , Indira Bifano Comini , Liniker Fernandes da Silva

Abstract The increase in the frequency of extreme weather events, such as drought, can negatively affect forest dynamics. Understanding this process in the Atlantic Forest and how global climate change affects its ecosystem, can be important for developing conservation and preservation strategies. Therefore, the main goal of this study, was to understand the effects of drought on tree mortality and carbon dynamics in a secondary Atlantic Forest. The study was conducted on a 17 ha secondary Atlantic Forest fragment. Data from 10 permanent plots, with 0.1 ha (20mx50m) each, randomly situated within the area were used. In the monitoring years (1994, 1997, 2000, 2004, 2008, 2010, 2013 and 2016), all individuals with DBH (Diameter at Breast Height; 1.3 m from the ground) greater than or equal to 5.0 cm were inventoried and identified. Carbon dynamics were evaluated. Historical weather data were obtained from the weather station of the National Institute of Meteorology (INMET) and used to calculate the Agricultural Reference Index for Drought (ARID). The correlation between ARID and tree dynamics was evaluated using the Sperman correlation coefficient. We adjusted a logistic regression to assess which factors were important in the risk of tree death. The gross increment was 43.21 MgC ha−1, including the carbon present in the recruitment. Net growth was 25.52 MgC ha−1, higher than the mortality rate, which was 17.70 MgC ha−1. The net periodic annual increment in carbon was 1.16 Mg ha−1 year−1. The highest mortality rates were concentrated in pioneer species and smaller trees. The drought index ARID is the important predictor of mortality risk. We found that the drought four years before the measurements affected carbon dynamics through reductions in growth and survival. The pioneer species showed high mortality in years with extreme drought events. Thus, the proposed drought index, ARID, provided an assessment of the response of forests to drought events, which affects their structure and dynamics.

中文翻译:

干旱对大西洋次生林树木碳动态的影响

摘要 干旱等极端天气事件频率的增加会对森林动态产生负面影响。了解大西洋森林的这一过程以及全球气候变化如何影响其生态系统,对于制定保护和保存战略非常重要。因此,本研究的主要目标是了解干旱对大西洋次生林中树木死亡率和碳动态的影响。该研究是在 17 公顷的次生大西洋森林碎片上进行的。使用了 10 个永久地块的数据,每个地块的面积为 0.1 公顷(20 米 x 50 米),随机分布在该地区。在监测年份(1994、1997、2000、2004、2008、2010、2013和2016)中,对胸高(胸高直径;距地面1.3 m)大于或等于5.0 cm的所有个体进行清查和识别。评估了碳动力学。历史天气数据来自美国国家气象研究所 (INMET) 的气象站,用于计算干旱农业参考指数 (ARID)。ARID 与树木动态之间的相关性使用 Sperman 相关系数进行评估。我们调整了逻辑回归来评估哪些因素对树木死亡的风险很重要。总增量为 43.21 MgC ha-1,包括招募中存在的碳。净增长为 25.52 MgC ha-1,高于死亡率,即 17.70 MgC ha-1。碳的净周期性年度增量为 1.16 Mg ha−1 year−1。死亡率最高的集中在先锋物种和较小的树木中。干旱指数 ARID 是死亡风险的重要预测指标。我们发现,测量前四年的干旱通过减少生长和存活来影响碳动态。在发生极端干旱事件的年份中,先锋物种的死亡率很高。因此,提议的干旱指数 ARID 评估了森林对干旱事件的响应,这会影响它们的结构和动态。
更新日期:2020-06-01
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