大气中的氮沉降影响森林植物和土壤系统的碳：氮：磷平衡灵活性：荟萃分析

IF 3.8 1区农林科学 Q1 FORESTRY

Forest Ecosystems Pub Date : 2024-01-01 DOI:10.1016/j.fecs.2024.100192

Xiyan Jiang , Xiaojing Wang , Yaqi Qiao , Yi Cao , Yan Jiao , An Yang , Mengzhou Liu , Lei Ma , Mengya Song , Shenglei Fu

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引用次数: 0

摘要

背景氮（N）沉积通过改变土壤养分的可用性来影响植物的吸收，从而影响森林化学计量的灵活性。然而，氮沉降对森林植物-土壤-微生物系统中碳（C）、氮和磷（P）的灵活性的影响仍不清楚。方法我们基于751对观测数据进行了荟萃分析，评估了不同氮强度（0-50、50-100、100 kg-ha-1-年-1的氮）、持续时间（0-5、5年）、方法（林下、林冠）和物质（铵氮、硝酸氮、有机氮、混合氮）下植物、土壤和微生物生物量C、N和P养分及化学计量对氮添加的响应。结果氮添加量明显提高了植物氮：磷（叶：14.98%，根：13.29%）、植物碳：磷（叶：6.8%，根：25.44%）、土壤氮：磷（13.94%）、土壤碳：磷（10.86%）、微生物生物量氮：磷（23.58%）、微生物生物量碳：磷（12.62%），但降低了植物碳：氮（叶：6.49%，根：9.02%）。此外，植物 C:N:P 的化学计量在短期氮输入下发生了显著变化，而土壤和微生物在高氮添加下发生了急剧变化。冠层氮添加主要通过改变植物氮含量来影响植物 C:N:P 的化学计量，而林下氮输入则更多地通过影响土壤 C 和 P 含量来改变植物 C:N:P 的化学计量。有机氮对植物和土壤的 C:N 和 C:P 有明显影响，而氨氮则改变了植物的 N:P。植物的 C:P 和土壤的 C:N 与年平均降水量（MAT）密切相关，氮添加下土壤和植物的 C:N:P 的化学平衡弹性与土壤深度有关。结论氮的添加显著增加了土壤、植物和微生物生物量中的 C:P 和 N:P，降低了植物的 C:N，加剧了森林的 P 限制。值得注意的是，这些影响取决于气候类型、土壤层和氮的输入形式。这些发现加深了我们对森林生态系统中植物-土壤系统养分循环机制以及植物对氮沉积的反应策略的理解。

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Atmospheric nitrogen deposition affects forest plant and soil system carbon:nitrogen:phosphorus stoichiometric flexibility: A meta-analysis

Background

Nitrogen (N) deposition affects forest stoichiometric flexibility through changing soil nutrient availability to influence plant uptake. However, the effect of N deposition on the flexibility of carbon (C), N, and phosphorus (P) in forest plant-soil-microbe systems remains unclear.

Methods

We conducted a meta-analysis based on 751 pairs of observations to evaluate the responses of plant, soil and microbial biomass C, N and P nutrients and stoichiometry to N addition in different N intensity (0–50, 50–100, >100 kg⋅ha⁻¹⋅year⁻¹ of N), duration (0–5, >5 year), method (understory, canopy), and matter (ammonium N, nitrate N, organic N, mixed N).

Results

N addition significantly increased plant N:P (leaf: 14.98%, root: 13.29%), plant C:P (leaf: 6.8%, root: 25.44%), soil N:P (13.94%), soil C:P (10.86%), microbial biomass N:P (23.58%), microbial biomass C:P (12.62%), but reduced plant C:N (leaf: 6.49%, root: 9.02%). Furthermore, plant C:N:P stoichiometry changed significantly under short-term N inputs, while soil and microorganisms changed drastically under high N addition. Canopy N addition primarily affected plant C:N:P stoichiometry through altering plant N content, while understory N inputs altered more by influencing soil C and P content. Organic N significantly influenced plant and soil C:N and C:P, while ammonia N changed plant N:P. Plant C:P and soil C:N were strongly correlated with mean annual precipitation (MAT), and the C:N:P stoichiometric flexibility in soil and plant under N addition connected with soil depth. Besides, N addition decoupled the correlations between soil microorganisms and the plant.

Conclusions

N addition significantly increased the C:P and N:P in soil, plant, and microbial biomass, reducing plant C:N, and aggravated forest P limitations. Significantly, these impacts were contingent on climate types, soil layers, and N input forms. The findings enhance our comprehension of the plant-soil system nutrient cycling mechanisms in forest ecosystems and plant strategy responses to N deposition.

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来源期刊

Forest Ecosystems Environmental Science-Nature and Landscape Conservation

CiteScore

7.10

自引率

4.90%

发文量

1115

审稿时长

22 days

期刊介绍： Forest Ecosystems is an open access, peer-reviewed journal publishing scientific communications from any discipline that can provide interesting contributions about the structure and dynamics of "natural" and "domesticated" forest ecosystems, and their services to people. The journal welcomes innovative science as well as application oriented work that will enhance understanding of woody plant communities. Very specific studies are welcome if they are part of a thematic series that provides some holistic perspective that is of general interest.