Long-term nitrogen loading alleviates phosphorus limitation in terrestrial ecosystems.,Global Change Biology

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Long-term nitrogen loading alleviates phosphorus limitation in terrestrial ecosystems.
Global Change Biology ( IF 10.8 ) Pub Date : 2020-06-12 , DOI: 10.1111/gcb.15218
Ji Chen _{1,

2,

3} , Kees J van Groenigen ₄ , Bruce A Hungate ₅ , César Terrer ₆ , Jan-Willem van Groenigen ₇ , Fernando T Maestre _{8,

9} , Samantha C Ying ₁₀ , Yiqi Luo ₅ , Uffe Jørgensen _{1,

2} , Robert L Sinsabaugh ₁₁ , Jørgen E Olesen _{1,

3} , Lars Elsgaard _{1,

3}

Affiliation

Department of Agroecology, Aarhus University, Tjele, Denmark.
Aarhus University Center for Circular Bioeconomy, Aarhus University, Tjele, Denmark.
iCLIMATE Interdisciplinary Centre for Climate Change, Aarhus University, Roskilde, Denmark.
Department of Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK.
Center for Ecosystem Science and Society and Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ, USA.
Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory (LLNL), Livermore, CA, USA.
Soil Biology Group, Wageningen University, Wageningen, The Netherlands.
Instituto Multidisciplinar para el Estudio del Medio "Ramon Margalef", Universidad de Alicante, Alicante, Spain.
Departamento de Ecología, Universidad de Alicante, Alicante, Spain.
Department of Environmental Sciences, University of California, Riverside, CA, USA.
Department of Biology, University of New Mexico, Albuquerque, NM, USA.

Increased human‐derived nitrogen (N) deposition to terrestrial ecosystems has resulted in widespread phosphorus (P) limitation of net primary productivity. However, it remains unclear if and how N‐induced P limitation varies over time. Soil extracellular phosphatases catalyze the hydrolysis of P from soil organic matter, an important adaptive mechanism for ecosystems to cope with N‐induced P limitation. Here we show, using a meta‐analysis of 140 studies and 668 observations worldwide, that N stimulation of soil phosphatase activity diminishes over time. Whereas short‐term N loading (≤5 years) significantly increased soil phosphatase activity by 28%, long‐term N loading had no significant effect. Nitrogen loading did not affect soil available P and total P content in either short‐ or long‐term studies. Together, these results suggest that N‐induced P limitation in ecosystems is alleviated in the long‐term through the initial stimulation of soil phosphatase activity, thereby securing P supply to support plant growth. Our results suggest that increases in terrestrial carbon uptake due to ongoing anthropogenic N loading may be greater than previously thought.

中文翻译：

长期的氮负荷减轻了陆地生态系统中的磷限制。

陆地生态系统中人源氮（N）的沉积增加，导致净初级生产力普遍受到磷（P）的限制。但是，尚不清楚N诱导的P限制是否随时间变化以及如何随时间变化。土壤胞外磷酸酶催化土壤有机质中磷的水解，这是生态系统应对氮诱导的磷限制的重要适应机制。在这里，我们通过对140项研究和668项观察的荟萃分析表明，土壤中磷酸酶活性的N刺激随着时间的推移而减弱。短期氮负荷（≤5年）可将土壤磷酸酶活性显着提高28％，而长期氮负荷则无显着影响。在短期或长期研究中，氮负荷均不影响土壤有效磷和总磷含量。一起，这些结果表明，通过最初刺激土壤磷酸酶活性，长期缓解了氮素对生态系统磷的限制，从而确保了磷的供应以支持植物的生长。我们的结果表明，由于持续的人为氮负荷而导致的陆地碳吸收量的增加可能比以前认为的要大。

更新日期：2020-08-11

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