New PDF release: Agroforestry for Sustainable Land-Use Fundamental Research

By G. Schroth (auth.), Daniel Auclair, Christian Dupraz (eds.)

ISBN-10: 9048152585

ISBN-13: 9789048152582

ISBN-10: 9401706794

ISBN-13: 9789401706797

This quantity contains a variety of unique contributions offered at a workshop held in Montpellier, France, in June 1997. the 2 major goals of the workshop have been, to start with, to assemble what's understood in regards to the techniques underlying agroforestry perform, and, secondly, to supply a discussion board to discover correct versions and modelling methods. The workshop was once additionally in a position to play a task in studying the agroforestry structures encountered in temperate and Mediterranean parts, together with either conventional and extra leading edge agroforestry practices. the most elements mentioned have been: ecological interactions among parts, environmental influence, economics and coverage modelling.

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Extra info for Agroforestry for Sustainable Land-Use Fundamental Research and Modelling with Emphasis on Temperate and Mediterranean Applications: Selected papers from a workshop held in Montpellier, France, 23–29 June 1997

Example text

Different weed species thrive in agroforestry and forestry plantations, as a consequence of the tilling regime, the crop phenology, and the weeding operations (often mechanical in forest plantation, and chemical in agroforestry plantations). This was observed in 1996 at the Restinclieres estate, which is the most extensive agroforestry experiment running in France. In a walnut (luglans nigra x regia)- wheat association experiment, the 4 m wide strips of uncropped land along the tree lines were invaded in summer by red poppies (Papaver Rhoeas), resulting in high water competition with the trees, while in the forestry control treatment the trees were choked in spring with cruciferous species (Sinapis arvensis) that the farmer could not destroy in due time, neither with weedicides nor mechanically.

But even if these aspects have been carefully managed at the time of setting up the experiment, they may pose a problem later on. Agroforestry experiments are set up for many years, usually many decades in temperate areas, in order to obtain a timeintegrated evaluation over the whole rotation. Unpredictable events or uncontrolled factors may alter the very nature of the control plots in time. Biophysical control plots may become useless if a new action is required in the control plot but not in the agroforestry plot (or the reverse), resulting in an intractable confounding effect.

9 0 10 ---- Land Equivalent Ratio 20 30 Years - ~ 40 50 60 Crop + Tree partial yields Figure 2. Time change of Land Equivalent Ratios (LER) in an agroforestry stand consisting of Prunus avium trees in a Festuca arundinacea sward at Notre-Dame de Londres, France. As the trees grow older, the integrated LER is not equal to the sum of the annual partial yields for intercrop and trees. forestry and control plots. It may be assumed that object-oriented models are more versatile in this aspect. , 1997).

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Agroforestry for Sustainable Land-Use Fundamental Research and Modelling with Emphasis on Temperate and Mediterranean Applications: Selected papers from a workshop held in Montpellier, France, 23–29 June 1997 by G. Schroth (auth.), Daniel Auclair, Christian Dupraz (eds.)


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