Soil δ15N is a better indicator of ecosystem nitrogen cycling than plant δ15N: A global meta-analysis

4区农林科学 Q2 Agricultural and Biological Sciences

Soil Science Pub Date : 2021-10-28 DOI:10.5194/soil-7-733-2021

K. Liao, X. Lai, Q. Zhu

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引用次数: 2

Abstract

Abstract. The nitrogen-15 (15N) natural abundance composition (δ15N) in soils or plants is a useful tool to indicate the openness of ecosystem N cycling. This study aimed to evaluate the influence of the experimental warming on soil and plant δ15N. We applied a global meta-analysis method to synthesize 79 and 76 paired observations of soil and plant δ15N from 20 published studies, respectively. Results showed that the mean effect sizes of the soil and plant δ15N under experimental warming were −0.524 (95 % CI (confidence interval): −0.987 to −0.162) and 0.189 (95 % CI: −0.210 to 0.569), respectively. This indicated that soil δ15N had negative response to warming at the global scale, where warming had no significant effect on plant δ15N. Experimental warming significantly (p<0.05) decreased soil δ15N in Alkali and medium-textured soils, in grassland/meadow, under air warming, for a 4–10-year warming period and for an increase of >3 ∘C in temperature, whereas it significantly (p<0.05) increased soil δ15N in neutral and fine-textured soils and for an increase of 1.5–3 ∘C in temperature. Plant δ15N significantly (p<0.05) increased with increasing temperature in neutral and fine-textured soils and significantly (p<0.05) decreased in alkali soil. Latitude did not affect the warming effects on both soil and plant δ15N. However, the warming effect on soil δ15N was positively controlled by the mean annual temperature, which is related to the fact that the higher temperature can strengthen the activity of soil microbes. The effect of warming on plant δ15N had weaker relationships with environmental variables compared with that on soil δ15N. This implied that soil δ15N was more effective than plant δ15N in indicating the openness of global ecosystem N cycling.

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土壤δ15N比植物δ15N更能反映生态系统氮循环

摘要土壤或植物中氮-15 (15N)自然丰度组成(δ15N)是反映生态系统氮循环开放性的有效工具。本研究旨在评价试验增温对土壤和植物δ15N的影响。采用全球meta分析方法，对20篇已发表的土壤和植物δ15N的79和76个成对观测结果进行了综合。结果表明，实验增温条件下土壤和植物δ15N的平均效应值分别为- 0.524 (95% CI: - 0.987 ~ - 0.162)和0.189 (95% CI: - 0.210 ~ 0.569)。这表明在全球尺度上，土壤δ15N对全球变暖有负响应，而全球变暖对植物δ15N没有显著影响。实验升温显著(p3°C)，而在中性和细质土壤中显著(p<0.05)增加土壤δ15N，并使温度增加1.5-3°C。中性和细粒土壤植物δ15N随温度升高显著(p<0.05)升高，碱土植物δ15N显著(p<0.05)降低。纬度不影响土壤和植物δ15N的增温效应。而对土壤δ15N的增温效应受年平均温度的正控制，这与较高的温度能增强土壤微生物的活性有关。增温对植物δ15N的影响与环境变量的关系弱于对土壤δ15N的影响。这表明土壤δ15N比植物δ15N更能反映全球生态系统氮循环的开放性。

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来源期刊

Soil Science 农林科学-土壤科学

CiteScore

2.70

自引率

0.00%

发文量

审稿时长

4.4 months

期刊介绍： Cessation.Soil Science satisfies the professional needs of all scientists and laboratory personnel involved in soil and plant research by publishing primary research reports and critical reviews of basic and applied soil science, especially as it relates to soil and plant studies and general environmental soil science. Each month, Soil Science presents authoritative research articles from an impressive array of discipline: soil chemistry and biochemistry, physics, fertility and nutrition, soil genesis and morphology, soil microbiology and mineralogy. Of immediate relevance to soil scientists-both industrial and academic-this unique publication also has long-range value for agronomists and environmental scientists.