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nitrogen resorption and fractionation during leaf senescence in typical tree species in Japan

Journal of Forestry Research 2020年第6期31卷 2053-2062页

作者： Ayako Enta Mika Hayashi Maximo Larry Lopez Caceres Lei Fujiyoshi Toshiro Yamanaka Akira Oikawa Felix Seidel Faculty of Agriculture Yamagata UniversityWakabamachi 1-23Tsuruoka 997-8555Japan Research Institute for Humanity and nature Motoyama 457-4KamigamoKita-kuKyoto 603-8047Japan Department of Ocean and Environmental Sciences Tokyo University of Marine Science and Technology4-5-7 Konan Minato-kuTokyo 108-8477Japan

In northeastern Japan,an area of high precipitation and mountains,beech(Fagus creanata Blume),larch(Larix kaempferi Lamb.),cedar(Cryptomeria japonica ***)and black locust(Robinia pseudoacacia L.)were evaluated for n resorption and n isotope fractionation in preand post-abscission leaves in comparison to green *** highest leaf n concentration in summer corresponded to the n-fi xing black locust,followed in decreasing order by the deciduous beech and larch and evergreen *** the other hand,the lowest n resorption effi ciency corresponded to black locust and the highest to beech,in increasing order by larch and *** tree species returned signifi cant amounts of n before leaf abscission;however,n isotope fractionation during leaf n resorption was only found for beech,with a depleted n isotope value from green to pre-abscission *** most n,however,was resorbed from pre-abscission to *** result may indicate thatδ15 n fractionation took place during n transformation processes,such as protein hydrolysis,when the concentration of free amino acids increased *** diff erence in the type of amino acid produced by each species could have infl uenced the n isotope ratio in beech but not in the other tree *** results of this study showed that it is possible to infer the type and timing of processes relevant to n resorption by analyzing leafδ15 n variation during senescence.

关键词： Amino acids Cool temperate forest Fresh litter n resorption δ15 n

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