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most critical variable was found to be plant type, so the overall effect will
depend on the number of species and their abundance in the shrubland eco-
system. Evidence of the cumulative effects of warmer, drier conditions was
observed in the form of a 15 % decrease in organic matter content over a six-
year period.
With respect to soil nutrients, the data reveal that nitrogen production
increased when the test plots were exposed to higher temperatures, but only
when soil moisture was within certain bounds. Unfortunately, the extended
periods of drought are likely to push northern shrublands into the moisture
danger zone. Phosphorus levels were relatively unaffected by the simulated
changes in weather patterns.
The results of the Vulcan research demonstrate the vulnerability of
shrubland ecosystems to climate change, particularly in northern Europe.
NERC and its partners disseminated this knowledge through papers, meet-
ings, newsletters and so forth in the hope of inspiring further action to limit
climate change. In addition, the data can be used to improve soil parameteri-
sation schemes in global climate models.
PROJECT WORK
27. Do some research about ecological problems in your region. Think
about ways to improve the ecological conditions. Work out and present
your project.
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