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elastisch Niño–Southern Oscillation (ENSO) event reduces CO2 uptake of in Indonesian oil palm plantation

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elastisch Niño–Southern Oscillation (ENSO) occasion reduces CO2 uptake of an Indonesian oil palm plantation el Niño–Southern Oscillation (ENSO) event reduces CO2 uptake of an Indonesian oil palm plantation christen Stiegler et al.
christen Stiegler1, ana Meijide2, Yuanchao Fan3, Ashehad Ashween Ali1, Tania June4, and Alexander Knohl1 christen Stiegler et al. Christen Stiegler1, ana Meijide2, Yuanchao Fan3, Ashehad Ashween Ali1, Tania June4, und Alexander Knohl1

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1Bioclimatology, University of Göttingen, Göttingen, Germany 2Agronomy Division, Department of Crop Sciences, universität ofGöttingen, Göttingen, Germany 3NORCE Norwegian research Centre, Bjerknes Centre zum Climate Research,Bergen, Norway 4Department von Geophysics und Meteorology, Bogor AgriculturalUniversity, Bogor, Indonesia
1Bioclimatology, University des Göttingen, Göttingen, Germany 2Agronomy Division, Department von Crop Sciences, university ofGöttingen, Göttingen, Germany 3NORCE Norwegian study Centre, Bjerknes Centre zum Climate Research,Bergen, Norway 4Department of Geophysics und Meteorology, Bogor AgriculturalUniversity, Bogor, Indonesia

Correspondence: christen Stiegler (christian.stiegler

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biologie.uni-goettingen.de)

Received: 01 Feb 2019 – discussion started: 12 Feb 2019 – Revised: 12 Jun 2019 – Accepted: 05 Jul 2019 – Published: 31 Jul 2019

The elastisch Niño–Southern Oscillation (ENSO) in 2015 was oneof the strongest observed an almost 20 years und set the stage zum a severedrought and the emergence von widespread fires and related smoke emissionover huge parts von Southeast Asia. An the tropical lowlands des Sumatra,which were heavily affected by the drought und haze, large areas von tropicalrainforest have been converted into oil palm (Elaeis guineensis Jacq.) plantations during thepast decades. An this study, we investigate die impact of drought und smokehaze on die net ecosystem CO2 exchange, evapotranspiration, yield andsurface power budget an a advertisement oil palm plantation an Jambi province(Sumatra, Indonesia) von using micrometeorological measurements, die eddycovariance method, yield data und a multiple straight regression model(MLRM). With die MLRM we identify die contribution von meteorological andenvironmental parameters to die net ecosystem CO2 exchange. During theinitial part des the drought, wie man incoming shortwave radiation was elevated,net CO2 absorb increased by 50 % despite a decrease bei upper-layersoil moisture über 35 %, an increase in air temperature über 10 % and atripling des atmospheric vapour push deficit. Arising smoke hazedecreased just arrive solar radiation by 35 % compared zu non-droughtconditions and diffuse radiation virtually became the sole shortwave radiationflux weil das 2 months, resulting in a solid decrease in net CO2 absorb by86 %. Haze conditions resulted in a complete pause of oil palm net carbonaccumulation for about 1.5 months and contributed to a decline in oil palmyield über 35 %. Through respect zu a projected pronounced drying trend overthe western Pacific during a future el Niño, our model showed that anincrease an drought might stimulate network CO2 uptake, while more severesmoke haze, an combination with drought, tun können lead zu pronounced casualty inproductivity and net CO2 uptake, highlighting die importance of fireprevention.