For short rotation forestry, which density per hectare provides the greatest amount of biomass in 5 years for poplar sp.?
Lulian,
As Dibs says, is a very interesting question, but it is not the same a Eucalyptus that a Pinus (for example). Some species need a large air space for the development of its branches and 1000 could plant only plants. In other species that require less air space you could plant 4,000 plants per hectare, when the objective is to maximize biomass. You should always keep in mind that maximizing biomass production affects the nutrient content in the system and its impact is negative.
I completely agree with Rodolfo. It strongly depends on the species, soil and climatic region. In Germany e.g. we would plant 8300 seedlings of poplar per hectare, see here:
Article Bioenergy potential in Germany - Assessing spatial patterns ...
Sorry, i forgot to mention, but i was interested about poplar sp. In temperate condition site.
Lulian, the answer is not to explain in 10 lines, but you have a lot of literature available on this species. I think you should read and build a base figure out what you want and then contact promptly researchers working on the topic of your interest. For example, some researchers are working with production of biomass for use as food for cattle, while the majority are in production of biomass for bioenergy. In the latter I have a printed publication can also be found online at:
http://www.inia.es/gcontrec/pub/Manual_de_cultivos_de_Populus_spp__(baja_resolucion-interiores)_1281085926750.pdf.
regards
But Iulian, your experiments with poplar are already running. What are they telling you? :-)) The plantations were using a single density?
YES, you're right, for me and for many others, the increase in density is correlated with a decrease in the biomass and at the same time in the proportion of biomass for stem. But Djomo, 2015 did not find a correlation between them all, in a database composed of 47 studies.
Hi Lulian, it also would be great that you develop a stand density management diamgram (SDMD) for your own target, in which include stand density, dominant height, quadratic mean diameter and biomass, etc. It is difficult to say that which density provide greatest biomass, because it is site specific. However, you can use SDMD to optimize your biomass target. one example as follows:
Hi,
modern 5 a rotation SRC in Europe with max yield in bdt/ha is 1660 trees per ha, usually in 3x2m spacing. The genotypes used are usually P. euroamericana clones. Would be great to receive a copy of your article once you are published lulian.
cheers
christoph
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