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A particular class of data intensive wireless sensor networks are those networks where sensors periodically measure data with high rates. The focus of this work is on the efficient transport of high volumes of sampled data through a multi-hop network with limited resources using a routing tree. This paper analyzes TDMA schemes for this purpose with respect to buffer usage and energy consumption. In particular, it is shown, that classical TDMA schemes are not optimal for tree-routing in data-intensive sensor networks.