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Title of Journal: Trees

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Abbravation: Trees

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Springer-Verlag

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10.1002/jlac.18721630102

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1432-2285

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Fineroot growth fine root mortality and leaf mo

Authors: Shogo Imada Norikazu Yamanaka Shigenobu Tamai
Publish Date: 2010/02/09
Volume: 24, Issue: 3, Pages: 499-506
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Abstract

Water table fluctuation in arid land regions may alter tree fineroot growth and mortality thereby affecting leaf growth To reveal the effects of water table fluctuation on fineroot growth and mortality and their relation to leaf growth we exposed P alba L cuttings to various fluctuating water table depths 1yearold rooted cuttings were grown individually in pots containing sandy soil in a greenhouse in three water table depth treatments for 45 days constant depth at 45 cm from the soil surface fluctuating depths between 45 and 30 cm and fluctuating depths between 45 and 15 cm Fineroot biomass and mortality biomass partitioning among plant parts and wholetree growth responses were determined in cuttings harvested every 15 days Fluctuation of water tables increased the mortality of fine roots at the layers near the soil surface Fineroot mortality increased during the shallower water table depth period At the wholeroot system level although fineroot mortality increased when the water table was shallower fineroot biomass was similar among the treatments suggesting that P alba cuttings would sustains its standing fineroot biomass under fluctuating water table depth conditions Our structural equation modeling showed the fineroot proportion affects leaf morphological changes suggesting that there would be a parallel relationship of morphological changes between roots and leaves with fluctuating water tablesWe thank Shigeo Katagiri Faculty of Agriculture Shimane University and Mitsuhiro Inoue Arid Land Research Center Tottori University for their helpful comments on this study We also thank Takeshi Taniguchi Arid Land Research Center Tottori University for discussion and suggestion on the data analysis We are grateful to two anonymous reviewers and the editor for their comments and suggestions on an earlier version of the manuscript

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