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<br /> <br />~J <br />TWig, seed and leaf litter production will be measured using collectors <br />to catch litter of these different plant parts. Twenty litter collectors, <br />each 5x5 meters in size, will be randomly placed at each study site. Litter <br />will be collected monthly, sorted by type (leaf, seed, stem) dried and <br />weighted.. <br />Tree crown condition of all trees within the plots will be placed into <br />crown cordition categories and evaluated monthly. The total dead stern area <br />within crown will be quantified monthly. <br />Tree sten growth rates will be measured using dendrometer growth bands <br />installed on all trees within plots and these will be measured monthly. Pre- <br />dawn xylem pressure water potential will be measured using Scholander pressure <br />bomb. h1~~asurements will be taken in early spring, early sunurer, mid-sumner, <br />early fa'_1. <br />The width of tree rings will be measured from cores to develop a data <br />base on ~innual growth rates during the trees" lives and to determine growing <br />conditions over the past century. If possible the tree growth rates will be <br />correlate~ci to past total annual and surtuner precipitation. <br />The sapwood basal area/leaf area index ratio will be calculated if time <br />and resources allow. This measure has been used in forestry in the Pacific <br />Northwest: to indicate which trees dying from beetle infestation. <br />The extent and distribution of casrse roots for trees of different age <br />will be determine and mapped. We will also correlate seasonal tree gravth and <br />phenolog}~ to the ground water table characteristics. <br />MONI~RING <br />The data collected will be used to provide above-ground warning signs of <br />cottonwood deterioration. These warning signs will involve changes in total <br />3 <br />