Affiliation:
1. School of Earth System Science Institute of Surface‐Earth System Science Tianjin University Tianjin China
2. Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China
3. College of Resources and Environment University of Chinese Academy of Sciences Beijing China
4. Faculty of Environmental Sciences and Natural Resource Management Norwegian University of Life Sciences Ås Norway
5. Center for Ecological Research Northeast Forestry University Harbin China
6. Earth Critical Zone and Flux Research Station of Xing'an Mountains Chinese Academy of Sciences Daxing'anling China
Abstract
AbstractElevated nitrogen (N) deposition and changes in reduced or oxidized component contribution greatly affect soil acidification. China has experienced a significant transformation of N deposition components from NHx to NOy over the past 40 years, but the effects of component transformation on soil acidification are poorly understood. Therefore, long‐term monitoring data and literature on N deposition, combined with the results of isotope experiments, were used to explore the contributions of different N forms on soil acidification in China's forests. Here, all processes related to NHx and NOy, including the transformation to NH4+ and NO3− and subsequent N cycling in the soil, were considered. We found that N‐induced soil acidification in 80% area of China’s forests was dominated by NHx deposition, and the other areas (South China) were dominated by NOy deposition in 2010s. From 1980 to 2019, the average contribution of NHx was higher than that of NOy but the latter contribution continued to increase. Meanwhile, the results showed that soil acidification increased with the decrease of the ratio of NHx to NOy (RNHx/NOy), which is mainly because NOy is more easily leached in the form of NO3− than that of NHx under the influence of different plant preferences and soil retention rates, resulting in a higher net proton production of NOy. Our research has powerful implications for policymaking, provides a theoretical basis for formulating different N reduction policies in different regions, and points out that the synergistic effect of RNHx/NOy changes should be considered to alleviate soil acidification.
Funder
National Natural Science Foundation of China
National Key Research and Development Program of China
China Postdoctoral Science Foundation
Publisher
American Geophysical Union (AGU)
Subject
Atmospheric Science,General Environmental Science,Environmental Chemistry,Global and Planetary Change
Cited by
2 articles.
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