Agroecosystems Lab

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Question 3


Is the intrinsic capacity of a soil to produce a crop increased by exposure to prolonged elevated CO2 concentrations?

A long-term collaborative research effort with ETH in Zürich, Switzerland is initiated. The impact of prolonged elevated CO2 on nutrient cycling and productivity on an agro-ecosystem are investigated using FACE technology.

Changes in the rate of N and C cycling are determined for a grass-clover system has been exposed to elevated CO2 concentrations since 1993. We are especially interested whether such a system becomes more efficient in its use of available nutrients after prolonged elevated CO2 exposure. Can it sustain increased crop production? Does the soil become a sink for C?


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