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Agriculture in the industrial world has gone A common interest of
the contributors is increas through dramatic changes over the past
decades. ing the understanding of the turnover of carbon
Mechanization in combination with high inputs of and inorganic
nutrients in terestrial ecosystems. fertilizers and pesticides has
turned deficits of agri The authors approach this topic from
different cultural products into surplus. Over the same directions
depending on their interests and ex period we have experienced
increased environment pertise. Difficulties are identified in the
quantifica al problems in both the atmosphere and our water tion of
below-ground production where death and resources, which have been
associated with the re-growth, if incorporated into the
calculations, changes in management practices. can change
production figures considerably as Concern about the potential
pollution by compared to values derived from "peak" estimates.
nitrogen fertilizers as well as the low utilization The role of
root-derived carbon is investigated in efficiency of applied
nitrogen by plants has created relation to nutrient competition
between roots and a need for a better understanding of nitrogen
microorganisms, the cost of N2 fixation and the cycling in the
plant-soil-water system. To achieve decomposition of organic
nitrogen. Mycorrhizae this, it is neccessary to study process
interactions use root-derived carbon and their roles in phos and
process regulation in an ecosystem context. phorus conservation and
in supplying nutrients to During the last decade many ecosystem
studies the host are exemplified.
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