Satellite data as indicators of tree biomass growth and forest dieback in a Mediterranean holm oak forest
Satellite data as indicators of tree biomass growth and forest dieback in a Mediterranean holm oak forest
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DOI：
10.1007/s13595-014-0408-y
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发表时间：
2014
影响因子：
3
通讯作者：
R. Ogaya;A. Barbeta;C. Basnou;J. Peñuelas
中科院分区：
文献类型：
--
作者：
R. Ogaya;A. Barbeta;C. Basnou;J. Peñuelas
在气候变化的框架内，在世界各地的许多森林中，特别是在地中海森林中，炎热和干燥条件导致的树木生长减少和死亡率增加。目的我们的目的是利用来自MODIS的遥感数据估计地中海霍尔姆橡树林的树木生长和死亡率。方法通过测量树木断面积来监测地上生物量的年增长，通过计算死茎来确定树木死亡率。利用MODIS产品的年平均值和气象资料分析了森林生长和死亡率之间的关系。结果死亡率和地上生物量的增加与降水量、9月标准化降水/蒸散指数（SPEI）以及一些MODIS产品如NDVI和增强型植被指数EVI相关性较好。然而，其他MODIS产品，如总初级生产力（GPP）和净光合作用，与树木死亡率或测量的生物量增加没有明显的关系。·结论MODIS产品作为生态系统生产力（总初级生产力，净光合作用）的代理与生物量的增加弱相关，并没有反映2011年秋季干旱后的死亡率。然而，NDVI和EVI是森林生产力和枯梢病的有效指标
•ContextIn the framework of climate change, decreased tree growth and enhanced mortality induced by hot and dry conditions are increasing in many forests around the world, and particularly in Mediterranean forests.•AimsOur aim was to estimate tree growth and mortality in a Mediterranean holm oak forest, using remote sensing data from MODIS.•MethodsWe monitored annual increases of aboveground biomass by measuring tree basal area, and we determined tree mortality by counting dead stems. We analyzed the relationships between forest growth and mortality with mean annual values of some MODIS products and meteorological data.•ResultsMortality and increases of aboveground biomass correlated well with precipitation, September standardized precipitation/evapotranspiration indices (SPEI), and some MODIS products such as NDVI and enhanced vegetation index EVI. Other MODIS products such as gross primary production (GPP) and net photosynthesis, however, showed no clear relationship with tree mortality or measured increases of biomass.•ConclusionThe MODIS products as proxies of ecosystemic productivity (gross primary productivity, net photosynthesis) were weakly correlated with biomass increase, and did not reflect the mortality following the drought of autumn 2011. Nevertheless, NDVI and EVI were efficient indicators of forest productivity and dieback