挪威云杉和苏格兰松树落叶分解过程中的碳(δ13C)和氮(δ15N)同位素动态变化

Forests Pub Date : 2024-07-24 DOI:10.3390/f15081294
Mukesh K. Gautam, Björn Berg, Kwang-Sik Lee
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引用次数: 0

摘要

我们研究了挪威云杉(NSL)和苏格兰松树(SPL)枯落物中稳定碳(δ13C)和氮(δ15N)同位素在超过 4 年的原位分解过程中的动态变化。与初始值相比,δ13CNSL 出现了微弱的富集(0.33‰),而δ13CSPL 在分解结束时则出现了耗竭(-0.74‰)。在分解过程中,两种枯落物类型的δ15N都出现了消耗;δ15NNSL减少了-1.74‰,δ15NSPL减少了-1.99‰。选择性保存酸性不可水解残渣(AUR)对降低残余垃圾δ13C的影响仅在SPL中明显。在 NSL 中,只有在最初阶段 C/N 对 δ13C 值有很大影响。在后期阶段,δ13CNSL 呈非线性下降,同时 AUR 浓度增加,但效应大小较大,表明木质素在后期阶段对残留物的δ13C 起着推动作用。在氮浓度增加的同时,残留物中 15N 的消耗表明细菌对残留物的转化超过了真菌成分。δ15N值的持续下降进一步表明,细菌通过固定残余物中15N消耗殆尽的硝酸盐而占主导地位。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Carbon (δ13C) and Nitrogen (δ15N) Isotope Dynamics during Decomposition of Norway Spruce and Scots Pine Litter
We studied the dynamics of stable carbon (δ13C) and nitrogen (δ15N) isotopes in litter from Norway spruce (NSL) (Picea abies) and Scots pine (SPL) (Pinus silvestris) during in situ decomposition over a period of more than 4 years. Relative to initial values, δ13CNSL showed a weak enrichment (0.33‰), whereas δ13CSPL was depleted (−0.74‰) at the end of decomposition. Both litter types experienced a depletion in δ15N during decomposition; δ15NNSL decreased by −1.74‰ and δ15NSPL decreased by −1.99‰. The effect of the selective preservation of acid-unhydrolyzable residue (AUR) in lowering δ13C of the residual litter was evident only in SPL. In the NSL, only in the initial stage did C/N have a large effect on the δ13C values. In the later stages, there was a non-linear decrease in δ13CNSL with a simultaneous increase in AUR concentrations, but the effect size was large, suggesting the role of lignin in driving δ13C of residues in later stages. Depletion in 15N in the residual litters concomitant with the increase in N concentration suggests bacterial transformation of the litter over fungal components. A consistent decline in δ15N values further implies that bacterial dominance prompted this by immobilizing nitrate depleted in 15N in the residual litter.
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