David South wrote: > While in Brazil, I saw a block-plot test of E. grandis that > researachers said produced 87.8 cubic meters/ha/yr of wood > from SEEDLINGS! The best clone (from rooted cuttings) > produced 95.6 cubic meters/ha/yr (measured at age 33 months). > > David South > > At 05:41 PM 10/7/98 -0700, you wrote: > >Here's a simple one: > > > >What are the highest yields for plantation species? Figures I've got > suggest > >that eucalypts might, ideally, give up to 20 metric tons per hectare. > > >Someone mentioned poplars giving up to 40 tpa and I'm aware that > beyond > >trees, the grass Miscanthus may outyield these. > > > >If you don't have figures at your fingertips, any websites to search > would > >be much appreciated. > > > >I also appreciate that we have to consider inputs, sustainability, > long term > >pest and disease issues etc. but I'm just looking for ballpark > figures for > >the moment. > > > >This could be Guiness Book of Records time ... > > > >Regards > > > >Eric Boa > > > > David South > School of Forestry > Auburn University, AL 36849-5418 > > A member of the Forester's Chapter for ZPG > http://www.forestry.auburn.edu/people/facu > ty//biology/south/zpg/forester.html > > I am NOT a member of SAF since some of the nursery management > practices I > advocate > are based on economic principles and are not "consistent with > ecologically > sound principles." > > dsouth@forestry.auburn.edu > > 334-844-1022 > 334-844-1084 (FAX) > > As always, views expressed here are my own > (and I am not speaking on the behalf of others). > > I use only 100% post-consumer paper in my home printer. > (discarded used office paper printed on one side) > > ================================================= > ======================= > The world population is expected to double by the year 2100. > Therefore the annual demand for wood for energy (etc.) > will increase and might double (to more than 7 billion m3/yr). > To provide plantation wood for people in the future, > support the planting of trees on pastureland. > Set a goal of converting 8 million ha of pastureland/yr for the next > 55 years. > This would increase tree plantations to about 5% of the world's > landbase. > ========= > =============================================================== > > Support Zero Population Growth for the United States > > http://www.igc.apc.org/zpg/index.html I had filed an earlier contribution to the net on new technology that replaces conventional aerobic wastewater treatment with subsurface irrigation of semi-treated wastewater that plugs into your comment. First, the technology utilizes the water for plant growth instead of the current treat and discharge methodology. So far it is the only technology with the capacity to achieve zero discharge of pollutants into our surface waters and the ocean. Second, trees sequester CO2 instead of releasing it to the atmoshpere as does current aerobic treatment. Directing the US wastewater stream to tree plantation can achieve something on the order of a 15% reduction in our current CO2 emissions. Third, we capture the nitrogen and irreplaceable phosphorus that is now being dumped into the ocean. Fourth, the system is cheaper. Finally, valuable tree products can be grown instead of bacteria which has to be discarded. I would be happy to forward the earlier paper as well as research data on technology performance. Dr. Daniel Wickham IOS Corporation
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