Abstract
Designed as an integrated research program involving both Brazilian and UK researchers 'Nordeste' will attempt to redress this neglect: 1. Through the establishment of a permanent plot network similar to that existing in moist tropical forests allowing measurements of Caatinga canopy structure and dynamics and both their short- and long-term responses to climate change to be evaluated. 2. With the aid of new measurements designed to better quantify the biodiversity of the region and to develop an understanding of how it varies in response to variations in soils and climate. 3. Via the development of mechanistic models of semi-arid ecosystem response to climate change a series of detailed structural, physiological measurements across the wide range of different Caatinga sub-types found in the region. These will be made both above-and below-ground and in natural and degraded ecosystems of the region. A special emphasis will be placed on measurements designed to help us understand why it is that under certain circumstances it is that very high biomass stands of Caatinga occur despite the very low rainfall. (AU)
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