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Long‐term nitrogen enrichment does not increase microbial phosphorus mobilization in a northern coniferous forest
Functional Ecology ( IF 4.6 ) Pub Date : 2020-10-16 , DOI: 10.1111/1365-2435.13701 Benjamin Forsmark 1 , Håkan Wallander 2 , Annika Nordin 3 , Michael J. Gundale 1
中文翻译：
长期富氮不会增加北部针叶林中微生物的磷动员
更新日期：2020-10-16
Functional Ecology ( IF 4.6 ) Pub Date : 2020-10-16 , DOI: 10.1111/1365-2435.13701 Benjamin Forsmark 1 , Håkan Wallander 2 , Annika Nordin 3 , Michael J. Gundale 1
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- Nitrogen (N) deposition can enhance carbon (C) capture and storage in northern coniferous forests but it may also enhance the demand for phosphorus (P). While it is well established that long‐term N enrichment can decrease decomposition and enhance the accumulation of C in soils, it remains uncertain if a higher demand and acquisition of P influence soil C.
- We studied microbial phosphorus mobilization and growth within a long‐term N enrichment experiment in a Norway spruce forest, where N deposition was simulated by adding 0, 12.5 or 50 kg N ha−1 year−1 for 21 years (n = 12), by incubating microbial ingrowth cores with needles and humus with low and high P content, and with sand with and without mineral apatite P.
- Long‐term N enrichment had no effect on microbial P mobilization in needles and humus and did not enhance the positive effect that apatite had on fungal growth. However, it consistently strengthened the retention of C in the soil by decreasing decomposition of needle and humus, both with low and high P content, and by increasing fungal growth in sand‐filled ingrowth cores. Furthermore, we did not find any evidence that higher microbial P mobilization in response to N enrichment affected soil C storage.
- These results show that long‐term N enrichment in relatively young soils dominated by coniferous trees and ectomycorrhizal fungi can have relatively small impact on microbial P mobilization from organic sources and on the potential to mobilize P from minerals, and subsequently that elevated P demand due to N enrichment is unlikely to lead to a reduction in the soil C accumulation rate.
中文翻译：
长期富氮不会增加北部针叶林中微生物的磷动员
- 氮（N）的沉积可以增强北部针叶林中碳（C）的捕获和储存，但也可能增加对磷（P）的需求。虽然已经确定长期的氮富集可以减少土壤中C的分解并增加C的积累，但对更高的需求和对P的吸收是否会影响土壤C仍是不确定的。
- 我们在挪威云杉林的长期氮富集实验中研究了微生物磷的迁移和生长，其中通过在0年，12.5或50 kg N ha - 1 年- 1年内添加21年（n = 12）来模拟氮沉降，通过用低磷和高磷含量的针和腐殖质以及含有或不含矿物磷灰石P的沙子孵育微生物向内生长的核。
- 长期富氮对针和腐殖质中微生物P的动员没有影响，也没有增强磷灰石对真菌生长的积极作用。但是，它通过减少针叶和腐殖质（低磷和高磷含量）的分解以及增加沙土向内生长的核中真菌的生长，不断地增强了碳在土壤中的保留。此外，我们没有发现任何证据表明微生物对氮的富集提高了磷的动员能力，从而影响了土壤的碳储量。
- 这些结果表明，在针叶树和外生菌根真菌为主的相对较年轻的土壤中长期富氮对有机源微生物富集磷和从矿物中富集磷的潜力影响较小，随后由于氮的富集不太可能导致土壤碳积累速率的降低。
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