Wildfire effects on the fate of deposited nitrogen in a boreal larch forest

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Biogeochemistry Pub Date : 2024-04-11 DOI:10.1007/s10533-024-01135-1
Weili Liu, Jiaxing Zu, B Liu, Lin Qi, Wei Huang, Yunting Fang, Jian Yang
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Abstract

The effects of nitrogen (N) deposition on forests largely depend on the ecosystem N status and the fates of deposited N. Boreal forests are typically N-limited ecosystems and are considered to be more efficient in retaining deposited N relative to temperate and tropical forests. As a primary disturbance in boreal forests, wildfires may alleviate N limitation in the burned ecosystem and increase mineralization, resulting in the altered outcomes of the N deposition. In order to explore the effects of a severe wildfire on the retention of deposited N, we investigated the fates of newly deposited N in burned and unburned boreal larch forests by applying 15NH4NO3 tracers to the forest floors. Results showed that total ecosystem retention for the deposited N was 60% in the forest recovering from a severe wildfire burned five years ago, significantly lower than in the unburned mature forest (89%). The difference was mainly attributed to the substantially lower retention in vegetation (8.3%) in the burned site than in the unburned forest (32.4%), as tracer recoveries in soil were similar (51.2 and 56.6%, respectively). Although most 15N tracer was immobilized in organic soil in both burned and unburned forests (33 and 47%, respectively), a noticeably higher amount of 15N was found in mineral soil in the burned forest (19%) than in the unburned forest (10%), suggesting mineral soil as a significant sink for N deposition in the burned forest. A higher total 15N retention in the unburned forest implies that more new N input may stimulate C sequestration and promote the productivity of the Eurasian boreal forest under the background of atmospheric N deposition. However, a considerable amount of deposited N may be lost from the disturbed boreal larch forest ecosystem after a severe wildfire.

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野火对北方落叶松林中沉积氮归宿的影响
氮(N)沉积对森林的影响在很大程度上取决于生态系统的氮状态和沉积氮的去向。北寒带森林是典型的氮限制生态系统,与温带和热带森林相比,被认为能更有效地保留沉积的氮。作为北方森林的主要干扰因素,野火可能会缓解被烧生态系统的氮限制并增加矿化度,从而改变氮沉积的结果。为了探索严重野火对沉积氮保留的影响,我们通过在林地施用 15NH4NO3 示踪剂,调查了北方落叶松林中被烧毁和未被烧毁的新沉积氮的命运。结果表明,在从五年前一场严重野火中恢复的森林中,生态系统对沉积氮的总保留率为 60%,明显低于未燃烧的成熟森林(89%)。造成这种差异的主要原因是,在烧毁的森林中,植被的保留率(8.3%)大大低于未烧毁森林的保留率(32.4%),而土壤中的示踪剂回收率则相差无几(分别为 51.2% 和 56.6%)。虽然大部分 15N 示踪剂都固定在烧毁森林和未烧毁森林的有机土壤中(分别为 33% 和 47%),但在烧毁森林的矿质土壤中发现的 15N 含量(19%)明显高于未烧毁森林(10%),这表明矿质土壤是烧毁森林中重要的氮沉积汇。未燃烧森林中 15N 的总保留量较高,这意味着在大气氮沉积的背景下,更多的新氮输入可能会促进固碳,提高欧亚北方森林的生产力。然而,在一场严重的野火之后,大量沉积的氮可能会从受干扰的北方落叶松森林生态系统中流失。
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来源期刊
Biogeochemistry
Biogeochemistry 环境科学-地球科学综合
CiteScore
7.10
自引率
5.00%
发文量
112
审稿时长
3.2 months
期刊介绍: Biogeochemistry publishes original and synthetic papers dealing with biotic controls on the chemistry of the environment, or with the geochemical control of the structure and function of ecosystems. Cycles are considered, either of individual elements or of specific classes of natural or anthropogenic compounds in ecosystems. Particular emphasis is given to coupled interactions of element cycles. The journal spans from the molecular to global scales to elucidate the mechanisms driving patterns in biogeochemical cycles through space and time. Studies on both natural and artificial ecosystems are published when they contribute to a general understanding of biogeochemistry.
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