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<br />il1LJl.; JKL' J
<br />Cottonwood Respons• Water Table Declines
<br />morphological changes, grovrth responses, and mortal-
<br />ity of Poptr[us co the torte, depth, and duration of water
<br />table declines ran aid monitoring efforts designed to
<br />claret[ and minimize the impacts of alluvial groundwa-
<br />ter depletion and resulting water svess on existing
<br />riparian Populvs Forests. For example, based on these
<br />findings, monitoring annual banch growth appears to
<br />be the single best indicator of sublethal water sveu in
<br />Populus (and see Willms and others 1998). Further-
<br />more, leaEsenescence, desiccation, and shedding are an
<br />effective way of detecting the onset of severe water
<br />stress, and monitoring of live crown volume can be used
<br />to predict impending mortality under condi[ions of
<br />prolonged water svess.
<br />Acknowledgments
<br />We acknowledge the Financial support of the West
<br />Arapaho Soil Conservation District and cooperation
<br />from the Colorado Stale Board of Land Commissioners,
<br />the State Soil Conservation Board, and Tu[de Apple-
<br />gate, Inc. Robert Zebroski, Dan Parker, and Sally Lobel,
<br />in particular, offered unfailing support Erik Eggelsmn
<br />assisted in all aspecs of data collection and convibu[ed,
<br />along with Jennifer Back, Andy Hautringer, Victor Lee,
<br />and Mazk Wondzell, to data analysis. Drs. J. M. Fried-
<br />man, W. L. Graf, R R Harris, and H. Piegay provided
<br />valuable comments and sugges[ions. This manuscript
<br />was prepazed by employees of the US Geological Survey
<br />as part of their official d[[[ies and, therefore, may not be
<br />copyrighted.
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