Stem injection of 15N-NH4NO3 into mature Sitka spruce (Picea sitchensis).
Stem injection of 15N-NH4NO3 into mature Sitka spruce (Picea sitchensis).
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DOI：
10.1093/treephys/tpu084
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发表时间：
2014-10
期刊：
影响因子：
4
通讯作者：
Mencuccini M
中科院分区：
文献类型：
--
作者：
Nair R;Weatherall A;Perks M;Mencuccini M
茎注射技术可用于将15 N引入树木中，以克服天然丰度的低变化，并用不同的15 N标记标记生物量，但往往针对各种物种的小树和小树，几乎没有复制。我们注入98原子%的15 N硝酸铵（NH4NO3）的解决方案到13个成熟的，9至13米高的边缘配置锡特卡云杉树，以产生大量的标记凋落物，检查整个冠层的同位素分布后，砍伐的总丰度的15 N和相对分布的同位素在整个个别树木。使用一个简单的质量平衡的树冠单独，根据观察到的总针叶生物量和建模的分支生物量，所有的同位素注入占，均匀分配之间的针叶和分支，但具有高度的变异性都在个别树木，树之间。冠层内15 N丰度和相对分布均偏向于树冠上部和中部。回收的标签在分支机构是更多变的比针叶，可能是由于氮分配的增长和存储，不同的季节性之间的树叶和木本生物量的差异。
Stem injection techniques can be used to introduce 15N into trees to overcome a low variation in natural abundance and label biomass with a distinct 15N signature, but have tended to target small and young trees, of a variety of species, with little replication. We injected 98 atom% 15N ammonium nitrate (NH4NO3) solution into 13 mature, 9- to 13-m tall edge-profile Sitka spruce trees in order to produce a large quantity of labelled litter, examining the distribution of the isotope throughout the canopy after felling in terms of both total abundance of 15N and relative distribution of the isotope throughout individual trees. Using a simple mass balance of the canopy alone, based on observed total needle biomass and modelled branch biomass, all of the isotope injected was accounted for, evenly split between needles and branches, but with a high degree of variability both within individual trees, and among trees. Both 15N abundance and relative within-canopy distribution were biased towards the upper and middle crown in foliage. Recovery of the label in branches was much more variable than in needles, possibly due to differences in nitrogen allocation for both growth and storage, which differ seasonally between foliage and woody biomass.
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