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In this new version, the data of 227 test plots of the former Stichting Industriehout were added. Also the location information of the test plots of the Dorschkamp/IBN were added. This database is part of the FEM growth and yield database, a collection of growth and yield data from even-aged monocultures.

The current database is part of the FEM growth and yield database, a collection of growth and yield data from even-aged monocultures (douglas fir, common oak, poplar, Japanese Larch, Norway spruce, Scots pine, Corsican pine, Austrian pine, red oak and several other species with only a few plots, even-aged mixed species forest plots, uneven-aged natural forest, uneven-aged selection forest and roadside plantations of poplar. The FEM growth and yield data base is currently supervised by Jan den Ouden and Frits Mohren. In the FEM growth and yield data collection for even-aged monocultures in general the data of four main studies and if available some additional studies are assembled: 1. Thinning research Wageningen University initiated by Becking1 1947 – 2005. For poplar there are no recordings after 1992. In total 58 monoculture plots were selected with ini-tial number of trees varying from 86 till 2207. Different varieties and a few aspen plots were selected. The treatments consisted of without thinning (28 plots), systematic thin-ning (35 plot) and thinning from below (2 plots). Over more than four decades, this study was supervised by A. van Laar, P.G. de Vries, J.H. Hildebrand, J.J. Jansen and H.H. Bartel-ink; 2. Growth and production study by research institute Dorschkamp/IBN 1923 – 1995. The aim of this research was the construction of yield tables. See Van Soest2 for the experi-mental design. There are 188 poplar plots in this study, but only the plots with 3 or more recordings were selected, in total 77 plots with known age but unknown recording date. But beside this plots there are also 5 aspen plots of which 4 with only 2 recordings with known age and recording date; 3. Spacing trials by research institute IBN 1960 – 1995; 6 plots with known age but un-known recording date; 4. HOSP3 1984 – 2000. A collection of about 3000 permanent sample point from the Dutch National Forest Inventory. In total 42 monocultures with poplar species or varieties were selected; 5. (only for douglas fir); 6. (only for douglas fir); 7. (only for Norway spruce); 8. Nelder Spacing trial by research institute IBN 1976-19954, containing 5 experimental Nelder fields of which 3 with poplar varieties with 6 to 9 series with equal spacing per tree. One series within the Nelder field is seen as a plot, resulting in 21 plots, but hence these plots are not all mutually independent

International audience; AbstractKey messageThe success of poplar plantations on forest land was affected by soil preparation, plant type, site, and clone. Mounding in combination with large plant types (rooted plants or long cuttings) of site-adapted clones achieved the highest survival and growth.ContextPoplars (Populus species and hybrids) are fast-growing trees used to make various products. In north European countries, they are mainly grown on agricultural land, but interest in planting poplars on forest land has increased.AimsPlant damage and mortality problems occur on forest land, probably due to soil conditions and competing vegetation. It is therefore of interest to investigate whether combinations of soil preparation methods and plant materials can improve establishment.MethodsAt three sites in southern Sweden, the effects of four soil preparation treatments (no soil preparation, patch scarification, mounding, soil inversion) in combination with three plant types (short cuttings, long cuttings, rooted plants) were studied.ResultsSurvival and growth were significantly influenced by site, soil preparation method, plant type, and their interactions. Mounding resulted in the best overall performance on all sites. Interactions between site and plant type revealed differences in growth dependent on site conditions, but rooted plants and long cuttings were in general most successful. Patch scarification and short cuttings were associated with lower survival and growth.ConclusionSoil preparation is needed to support survival and early growth, but the combination of method and plant type must be adapted to site conditions. The choice of clones should also be considered.

The current database is part of the FEM growth and yield database, a collection of growth and yield data from even-aged monocultures (douglas fir, common oak, poplar, Japanese Larch, Norway spruce, Scots pine, Corsican pine, Austrian pine, red oak and several other species, with only a few plots, even-aged mixed species forest plots, uneven-aged natural forest, uneven-aged selection forest and roadside plantattions of poplar. The FEM growth and yield data base is currently supervised by Jan den Ouden and Frits Mohren.

We have compared biomass-allocation patterns and frequency of sprouting among saplings of four tree species (Larix kaempferi, Betula platyphylla var. japonica, Populus maximowiczii, and Populus sieboldii) growing on a volcanic mountain in Hokkaido, northern Japan. Growing conditions were very harsh on the mountainside. Leaf mass and fine root mass relative to root mass were larger in L. kaempferi, and L. kaempferi root mass was less than for the other species. Sprouting ratios were high for the broadleaved species. Different allometries and sprouting ratios among species suggest that survival strategies for L. kaempferi were different from those for the broadleaved species. L. kaempferi has greater ability to increase leaf mass under harsh growing conditions; this probably results in large photosynthetic production by L. kaempferi on the volcano. In contrast, the two Populus species and Betula platyphylla seem to maintain populations through their ability to produce sprouts from large root systems.

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submitted by Ingrid Langer Zsfassung in dt. Sprache Wien, Univ. für Bodenkultur, Diss., 2011 OeBB