Effects of altitude, land use and microsites on early life performance of a high mountain tree: Insights from an in situ sowing experiment
Effects of altitude, land use and microsites on early life performance of a high mountain tree: Insights from an in situ sowing experiment
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海拔、土地利用和微场地对高山树木早期生命表现的影响：原地播种实验的见解
DOI：
10.1111/ddi.12956
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发表时间：
2019
影响因子：
4.6
通讯作者：
Hensen
中科院分区：
文献类型：
--
作者：
Cáceres;Schrieber;Lachmuth;Argibay;Renison;Hensen
目的了解森林景观中驱动范围变化的力量对于预测人为气候和土地利用变化下的物种分布至关重要。然而，实证研究探索这些组件如何共同影响关键的早期生命阶段的山区树种跨越环境梯度是稀缺的。我们使用高山树木Polylepis australisas模式物种来研究海拔高度和相关气候条件、牲畜土地利用和微立地特征对早期生命表现的相对重要性。阿根廷中部。方法我们建立了一个广泛的原位播种实验与强大的裂区设计，整合空间尺度范围从0.4平方米的子地块在微观网站水平（与植被和微地形结构有关）、牲畜围栏和几公顷的围栏地、海拔1，000米。在随后的两个生长seasons.ResultsMicrosite特征的早期生活性能的组件进行了监测发挥了重要作用。澳大利亚的一项研究表明，与海拔和/或土地利用的相互作用表明了其他机制：在低海拔地区，促进作用（可能减少干燥）占主导地位，而在高海拔地区，非生物胁迫（可能强烈的霜冻和辐射）压倒了任何微立地效应。在中海拔地区，竞争释放的好处胜过便利化，并且在牲畜存在的情况下，微站点效应变得重要。出现前和出现后的反应之间的不一致性说明了潜在的权衡之间的有益和有害影响的微网站条件后，性能在整个生命早期：一个有利的位置种子可能突然变成不利的幼苗。主要conclusionsWe解开如何改变海拔高度，人为干扰和微网站特性共同modulateP。澳大利亚在创业初期各阶段的业绩。当将特定的微生境归类为树木再生的“安全地点”时，这些信息是至关重要的，特别是在具有高度时空异质性的山区环境中。
AimUnderstanding the forces that drive range shifts in forest landscapes is imperative for predicting species distributions under anthropogenic climate and land use change. However, empirical studies exploring how these components jointly influence critical early life stages of mountain tree species across environmental gradients are scarce. We used the high mountain treePolylepis australisas model species to investigate the relative importance of altitude and associated climatic conditions, land use for livestock and microsite characteristics on early life performance.LocationCórdoba Sierras, central Argentina.MethodsWe set up an extensive in situ sowing experiment with a robust split‐plot design that integrated spatial scales ranging from 0.4 m2subplots at the microsite level (associated with vegetative and microtopographic structures), to livestock exclosure and enclosure plots of several hectares, to an altitudinal gradient of 1,000 m. Components of early life performance were monitored across two subsequent growing seasons.ResultsMicrosite characteristics played a fundamental role inP. australisestablishment, whereby interactions with altitude and/or land use suggested alternate mechanisms: facilitation (likely reduced desiccation) dominated at low altitude while at high altitude, abiotic stress (likely intensive frost and radiation) overruled any microsite effects. At mid‐altitude, benefits of competition release prevailed over facilitation and microsite effects gained importance under livestock presence. Inconsistencies between pre‐ and post‐emergence responses illustrated potential trade‐offs between beneficial and detrimental effects of microsite conditions upon performance throughout early life: a favourable location for seeds may abruptly turn adverse for seedlings.Main conclusionsWe unravel how changes in altitude, anthropogenic disturbances and microsite characteristics jointly modulateP. australisperformance across stages of early establishment. Such information is fundamental when categorizing specific microhabitats as “safe sites” for tree regeneration especially in mountain environments with high spatio‐temporal heterogeneity.
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影响因子：
2.7
作者：
Lise Tingstad;S. Olsen;K. Klanderud;V. Vandvik;M. Ohlson
通讯作者：
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DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
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DOI：
--
发表时间：
2009
期刊：
影响因子：
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作者：
P. Seltmann;A. Cocucci;D. Renison;A. Cierjacks;I. Hensen
通讯作者：
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影响因子：
3.7
作者：
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与家养食草动物和地形相关的树木人口统计的空间变化：来自播种和种植实验的见解
影响因子：
3.7
作者：
D. Renison;M. Chartier;M. Menghi;P. Marcora;R. C. Torres;M. Giorgis;I. Hensen;A. Cingolani
通讯作者：
A. Cingolani