Arch für Meteorol Geophys und Bioklimatologie Ser B 15:287–312. doi: 10.1139/x92-071īaltaxe R (1967) Air flow patterns in the lee of model windbreaks. doi: 10.1016/S0961-9534(99)00054-9Īuclair D, Bouvarel L (1992) Influence of spacing and short rotations on Populus trichocarpa × deltoides coppice. Further research is however needed to determine effects of increased biomass in outer tree rows on adjacent crop fields, which influences the whole system productivity.Īrmstrong A, Johns C, Tubby I (1999) Effects of spacing and cutting cycle on the yield of poplar grown as an energy crop. We recommend reducing the number of rows within SRC-strips, while increasing their total length. The results can contribute to improve the design of poplar SRC-strips in ACS in order to optimize biomass production. Both rotation cycles showed similar yearly biomass production. Middle rows of the SRC design, in both rotation cycles, revealed a quicker height growth than outer rows, but a reduced biomass production. With the 6-year rotation cycle, all leeward rows and the middle rows of the combined design showed larger diameters and higher biomass yields. Concerning the 3-year rotation cycle, higher numbers of shoots per tree as well as higher biomass yields compared to the control field were measured in outer rows, both leeward and windward. Diameters at breast height, tree heights, shoot numbers and mortality rates were measured to describe growth and estimate yield of outer and middle poplar rows within a tree strip. Two harvest cycles (a coppiced 3-year rotation cycle and a un-coppiced 6-year rotation cycle) and two strip designs (“SRC”: 6 poplar rows “Combined”: 4 poplar rows and 1 aspen row in the centre) were compared. An ACS incorporating poplar SRC has been established near Braunschweig in Lower Saxony (Germany) in 2008. However, limited data are available in such systems concerning biomass production of different strip designs. Moreover, compared to agrisivilcutural systems incorporating noble trees, ACS with short rotation coppice (SRC)-strips provide periodically high energy outputs and could help to answer environment and energetic political objectives in Germany. In temperate regions, short rotation woody crops cultivated as tree strips in alley-cropping agroforestry systems (ACS) can provide economic benefits by producing an additional commodity, and environmental benefits, e.g., soil erosion control, protection against evaporation and increased biodiversity.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |