Climate variability, tree increment patterns and ENSO-related carbon sequestration reduction of the tropical dry forest species Loxopterygium huasango of Southern Ecuador
Climate variability, tree increment patterns and ENSO-related carbon sequestration reduction of the tropical dry forest species Loxopterygium huasango of Southern Ecuador
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DOI：
10.1007/s00468-016-1362-0
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发表时间：
2016-02
期刊：
影响因子：
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通讯作者：
Susanne Spannl;F. Volland;Darwin Pucha;T. Peters;E. Cueva;A. Bräuning
中科院分区：
文献类型：
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作者：
Susanne Spannl;F. Volland;Darwin Pucha;T. Peters;E. Cueva;A. Bräuning
关键信息：2年（湿;干）的显著水文气候差异显著控制着L。2010/2011年拉尼娜干旱期间，花桑果在不同程度上受到了影响，甚至导致了“生长崩溃”。2007年，通过设置自动气象站调查了当地气候，并利用高分辨率点式树木生长计测量了树木的日生长变化。气候对生长行为的影响进行了评估。水文气候变量，如降水量和相对湿度，是控制树木生长的最重要因素。在2009年至2013年的研究期间，雨水输入的变化影响径向增长率和每日幅度的茎直径变化。厄尔尼诺-南方涛动（ENSO）引起的热带太平洋海面温度的变化影响了树木的生长速率。平均径向增量表现出较高的年际（高达7.89毫米）和个体间（高达3.88毫米）的变化。茎直径变化的每日幅度在2009年（湿）和2011年（干）这两个极端年份之间差异很大。与2009年相反，2011年拉尼娜干旱导致日振幅迅速减少，表明在厄尔尼诺/南方涛动相关干旱条件下树干生长完全停止（“生长停滞”），并表明极端气候事件对干旱热带森林生态系统的碳固存产生了很大影响。
Key messageStriking hydro-climatic differences of 2 years (wet; dry) dramatically control the increment pattern ofL. huasangoin varying extent,even causing a “growth collapse” during the La Niña drought 2010/2011.AbstractWe present the first multi-year long time series of local climate data in the seasonally dry tropical forest in Southern Ecuador and related growth dynamics ofLoxopterygium huasango, a deciduous tree species. Local climate was investigated by installing an automatically weather station in 2007 and the daily tree growth variability was measured with high-resolution point dendrometers. The climatic impact on growth behaviour was evaluated. Hydro-climatic variables, like precipitation and relative humidity, were the most important factors for controlling tree growth. Changes in rainwater input affected radial increment rates and daily amplitudes of stem diameter variations within the study period from 2009 to 2013. El Niño Southern Oscillation (ENSO) related variations of tropical Pacific Ocean sea surface temperatures influenced the trees’ increment rates. Average radial increments showed high inter-annual (up to 7.89 mm) and inter-individual (up to 3.88 mm) variations. Daily amplitudes of stem diameter variations differed strongly between the two extreme years 2009 (wet) and 2011 (dry). Contrary to 2009, the La Niña drought in 2011 caused a rapid reduction of the daily amplitudes, indicating a total cessation (‘growth collapse’) of stem increment under ENSO-related drought conditions and demonstrating the high impact of climatic extreme events on carbon sequestration of the dry tropical forest ecosystem.