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Extensive_description_of_the_dataset
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The study site (51°05´N / 10°27'E) is located in the core zone of the Hainich National Park, Germany, and comprises an area of about 150 ha. The study area is defined by the most probable footprint area of the eddy-covariance system (‘eddy tower’) installed at the study site and measuring the carbon dioxide (CO2), water vapor and energy exchange of the ecosystem. The data set contains data of (I) repeated forest inventories, (II) litter fall sampling, and (III) annual basal area increment of individual trees. All measurements were done within the footprint area of the eddy-covariance-tower. The first inventory (spring 2000) comprised a transect of adjacent inventory plots along the center of the footprint including 14 circular plots, each with a radius of 15 m. For the second inventory in spring 2005 this set of plots was enlarged by 20 additional plots that were distributed over the entire footprint according to an importance sampling design. The third inventory was done in spring 2011. Individual tree height of all trees was measured in 2005 (Vertex III, Haglöf, Schweden). Basal area increments per tree resulted from continuous measurements of diameter increment at breast height (automatic rope dendrometers, Max-Planck-Institute, Jena, and manual band dendrometers, D1, UMS GmbH München). Litter fall was sampled in litter traps (2003-2009: 29 traps, 0.5 m² per trap, since 2010: 25 traps, 0.25 m2 per trap), separated, dried at 70 °C and weighed. The data set is the basis for estimates of net primary productivity of above- and belowground wood (wood-NPP), leaves (leaf-NPP) and fruits (fruit-NPP) used for correlation and regression analyses in Martina Mund, Mathias Herbst, Alexander Knohl, Bertrand Matthäus, Jens Schumacher, Peter Schall, Lukas Siebicke, Rijan Tamrakar, and Christian Ammer (New Phytologist). It is not just a ‘trade-off’ – Indications for sink- and source-limitation to vegetative and regenerative growth in an old-growth beech forest. |
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