全球旱地土壤碳氮积累的环境驱动因素

IF 5.6 1区 农林科学 Q1 SOIL SCIENCE
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引用次数: 0

摘要

我们远未了解旱地土壤碳和氮储量的空间模式以及它们在不同土地覆被类型中如何变化。我们利用来自全球 129 个国家 12,000 个旱地观测点的数据,估算了不同土地覆被类型的土壤有机碳(SOC)和全氮(STN)储量,探讨了驱动其空间分布的因素,并预测了全球旱地在不同气候情景下的变化趋势。上层 100 厘米的土壤有机碳和总氮储量分别达到 419.5 和 38.2 Pg,其中上层 0-30 厘米占一半。森林、灌木林和草地的 SOC 储量最大,而 STN 储量在森林、裸露地区和耕地达到峰值。驱动 SOC 和 STN 空间模式的因素在不同土壤深度之间存在差异,年平均温度、pH 值和干旱度是驱动 0-30 厘米 SOC 和 STN 密度空间模式的主要因素,而土壤质地则是驱动 60-100 厘米 SOC 和 STN 密度空间模式的最强因素。在代表性气候路径(RCP)4.5 情景下,预计从 2020 年到 2100 年,SOC 和 STN 储量将分别减少 3.6% 和 4.0%,而在 RCP 8.5 情景下,预计分别减少 5.9% 和 6.4%。我们的研究结果表明,如果我们想准确预测未来气候情景下陆地生态系统的碳和氮积累并设计有效的减缓措施,我们就需要更好地探索深层土壤的驱动因素,因为深层土壤也积累了大量的 SOC 和 STN。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Environmental drivers of soil carbon and nitrogen accumulation in global drylands
We are far from understanding the spatial patterns of dryland soil carbon and nitrogen stocks and how they vary among different land cover types. We used data from 12,000 sites from 129 countries in global drylands to estimate soil organic carbon (SOC) and total nitrogen (STN) stocks in different land cover types, explore the factors driving their spatial distribution, and predict the trends under different climate scenarios in global drylands. SOC and STN stocks in the upper 100 cm reached 419.5 and 38.2 Pg, respectively, with the upper 0–30 cm accounting for half of them. The largest SOC stocks were found in forests, shrublands and grasslands, while STN stocks peaked in forests, bare areas and croplands. The factors driving the spatial patterns of SOC and STN varied among soil depths, with mean annual temperature, pH and aridity being the main factors driving the spatial patterns in SOC and STN density for 0–30 cm, and soil texture the strongest factor for 60–100 cm. Under the Representative Concentration Pathways (RCP) 4.5 scenario, SOC and STN stocks were predicted to decrease by 3.6 % and 4.0 %, respectively, from 2020 to 2100, whereas under the RCP 8.5 scenario, the projected decreases were 5.9 % and 6.4 % respectively. Our results indicate that if we want to accurately predict C and N accumulation, and design effective mitigation measures in terrestrial ecosystems under future climatic scenarios, we need to better explore the drivers that operate at the deeper soil depths, which also accumulate a significant amount of SOC and STN.
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来源期刊
Geoderma
Geoderma 农林科学-土壤科学
CiteScore
11.80
自引率
6.60%
发文量
597
审稿时长
58 days
期刊介绍: Geoderma - the global journal of soil science - welcomes authors, readers and soil research from all parts of the world, encourages worldwide soil studies, and embraces all aspects of soil science and its associated pedagogy. The journal particularly welcomes interdisciplinary work focusing on dynamic soil processes and functions across space and time.
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