Stem Mortality and Forest Dieback in a 20-Years Experimental Drought in a Mediterranean Holm Oak Forest
Stem Mortality and Forest Dieback in a 20-Years Experimental Drought in a Mediterranean Holm Oak Forest
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地中海圣栎林 20 年实验性干旱中的茎死亡率和森林枯死
DOI：
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发表时间：
2020
影响因子：
3.2
通讯作者：
J. Peñuelas
中科院分区：
文献类型：
--
作者：
R. Ogaya;Daijun Liu;A. Barbeta;J. Peñuelas
气候变暖预计将增加干旱和热浪等极端天气的强度和持续时间。因此，气候变化可能会增加世界各地许多生态系统的树干死亡率和森林枯死，特别是在半干旱森林。我们调查了气候条件和穿透水置换实验处理（土壤水分量减少15%）的影响干死亡率在地中海森林的强度。我们还调查了使用遥感数据从中分辨率成像光谱仪作为一种工具，估计干死亡率的强度和可能的森林管理策略，以减轻气候变化引起的森林枯死。年平均气温较高，降雨量较低时，尤其是春季和夏季，树干死亡率较高。死亡率更高，更受干旱处理的霍尔姆橡树，栎冬青，比在共同发生的高大灌木更好地适应干燥条件。两个光谱MODIS指数（NDVI和EVI）是很好的预测干死亡率，但其他（GPP，PsnNet，和NPP专门计算预测森林健康和发展）没有明确的干死亡率相关。选择性间伐能显著降低茎死亡率（尤其是Q.冬青），缓冲气候变化对森林结构的影响。最后，对该林目前的优势种Q.冬青，由种高灌木更好地适应干旱也进行了讨论。
Climatic warming is predicted to increase the intensity and duration of extreme weather such as droughts and heat waves. Climate change could therefore increase stem mortality and forest dieback in many ecosystems around the world, especially in semi-arid forests. We investigated the influence of climatic conditions and a throughfall displacement experimental treatment (15% decrease in the amount of soil moisture) on the intensity of stem mortality in a Mediterranean forest. We also investigated the use of remotely sensed data from MODIS as a tool to estimate the intensity of stem mortality and a possible strategy of forest management to mitigate this forest dieback induced by climate change. Stem mortality was higher when mean annual temperature was higher and rainfall was lower, especially during spring and summer. Mortality was higher and more affected by the drought treatment in the holm oak, Quercus ilex, than in co-occurring species of tall shrubs better adapted to drier conditions. Two spectral MODIS indices (NDVI and EVI) were good predictors of stem mortality, but others (GPP, PsnNet, and NPP specifically calculated to predict forest health and development) were not clearly correlated with stem mortality. Selective stem thinning strongly reduced stem mortality (especially in Q. ilex) by buffering the effects of climate change on forest structure. Finally, the possible future substitution of the current dominant species of this forest, Q. ilex, by species of tall shrubs better adapted to drought is also discussed.
DOI：
10.1073/pnas.0505734102
发表时间：
2005-10-18
影响因子：
11.1
作者：
Breshears, DD;Cobb, NS;Meyer, CW
通讯作者：
Meyer, CW