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@INPROCEEDINGS{Gbel:863386,
      author       = {Göbel, Leonie and Schmidt, Marcus and Heinlein, Florian
                      and Veldkamp, Edzo and Corre, Marife},
      title        = {{N}utrient losses and nutrient retention efficiencies in
                      temperate agroforestry systems versus conventional
                      agricultural systems},
      reportid     = {FZJ-2019-03459},
      year         = {2018},
      abstract     = {Modern agricultural production is considered unsustainable
                      and often is accompanied by detrimental environmental
                      effects such as nutrient leaching losses. This results in a
                      strong need for more environmentally friendly management
                      systems. Alley-cropping agroforestry systems, with tree
                      components implemented for bioenergy use, are innovative
                      agricultural systems since they take advantage of beneficial
                      ecological functions of both their tree and crop components.
                      In such systems, trees can act as a safety-net against
                      nutrient leaching as they can take up nutrients that are
                      beyond the reach of grass/crop or at times when grass/crop
                      demand is low. However, no comparison of nutrient losses and
                      nutrient retention efficiencyhave yet been conducted between
                      conventional and agroforestry systems. Our study therefore
                      aimed to 1) quantify nutrient losses in grassland/cro pland
                      agroforestry and conventional grassland/cropland, 2)
                      evaluate how efficiently nutrients are being retained in
                      both management systems (nutrient retention efficiency =
                      (1-leaching losses/soil-available nutrient), and 3) assess
                      whether differences in nutrient retention efficiencies
                      between grassland/cropland agroforestry and conventional
                      grassland/cropland are related to differences in microbial
                      nutrient-cycling processes in the soil or differences in
                      plant uptake of nutrients. We hypothesized that conventional
                      systems will have higher nutrient losses and lower nutrient
                      retention efficiencies than agroforestry systems.We
                      investigated six paired sites of conventional
                      grassland/cropland and grassland/cropland agroforestry with
                      alley cropping of fast growing tree species and grass/crop,
                      located in central Germany. Results from the growing season
                      of 2016/2017 will be presented. Measurements in agroforestry
                      were taken within tree strips and at various distances to
                      the tree strips within the grass/crop strips. Soil water
                      samples were collected monthly with lysimeters and the
                      samples analyzed for nutrient concentrations (nitrogen,
                      phosphorus, base cations). To calculate yearly nutrient
                      losses, drainage flux was estimated with the model Expert-N.
                      This study will provide the presently needed information on
                      whether alley-cropping agroforestry systems can reduce the
                      negative environmental impacts through leaching losses while
                      optimizing production and therefore might be a sustainable
                      alternative to conventional agriculture.},
      month         = {Feb},
      date          = {2018-02-26},
      organization  = {BONARES conference, Berlin (Germany),
                       26 Feb 2018 - 28 Feb 2018},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/863386},
}