A meta-analysis highlights globally widespread potassium limitation in terrestrial ecosystems

文献类型： 外文期刊

第一作者： Chen, Baozhang

作者： Chen, Baozhang;Fang, Jingchun;Chen, Baozhang;Fang, Jingchun;Chen, Baozhang;Piao, Shilong;Ciais, Philippe;Black, Thomas Andrew;Wang, Fei;Niu, Shuli;Zeng, Zhenzhong;Luo, Yiqi

作者机构：

关键词： aboveground production; meta-analysis; potassium fertilization; potassium limitation; terrestrial ecosystems

期刊名称：NEW PHYTOLOGIST （ 影响因子：9.4； 五年影响因子：10.5 ）

ISSN： 0028-646X

年卷期： 2023 年

页码：

收录情况： SCI

摘要： Potassium (K+) is the most abundant inorganic cation in plant cells, playing a critical role in various plant functions. However, the impacts of K on natural terrestrial ecosystems have been less studied compared with nitrogen (N) and phosphorus (P).Here, we present a global meta-analysis aimed at quantifying the response of aboveground production to K addition. This analysis is based on 144 field K fertilization experiments. We also investigate the influences of climate, soil properties, ecosystem types, and fertilizer regimes on the responses of aboveground production.We find that: K addition significantly increases aboveground production by 12.3% (95% CI: 7.4-17.5%), suggesting a widespread occurrence of K limitation across terrestrial ecosystems; K limitation is more prominent in regions with humid climates, acidic soils, or weathered soils; the effect size of K addition varies among climate zones/regions, and is influenced by multiple factors; and previous N : K and K : P thresholds utilized to detect K limitation in wetlands cannot be applied to other biomes.Our findings emphasize the role of K in limiting terrestrial productivity, which should be integrated into future terrestrial ecosystems models.

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