Nitrogen addition significantly affects forest litter decomposition under high levels of ambient nitrogen deposition.
<h4>Background</h4>Forest litter decomposition is a major component of the global carbon (C) budget, and is greatly affected by the atmospheric nitrogen (N) deposition observed globally. However, the effects of N addition on forest litter decomposition, in ecosystems receiving increasing...
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2014
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oai:doaj.org-article:827764485c8241878666b6b3fd32422e2021-11-18T08:32:26ZNitrogen addition significantly affects forest litter decomposition under high levels of ambient nitrogen deposition.1932-620310.1371/journal.pone.0088752https://doaj.org/article/827764485c8241878666b6b3fd32422e2014-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24551152/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>Forest litter decomposition is a major component of the global carbon (C) budget, and is greatly affected by the atmospheric nitrogen (N) deposition observed globally. However, the effects of N addition on forest litter decomposition, in ecosystems receiving increasingly higher levels of ambient N deposition, are poorly understood.<h4>Methodology/principal findings</h4>We conducted a two-year field experiment in five forests along the western edge of the Sichuan Basin in China, where atmospheric N deposition was up to 82-114 kg N ha(-1) in the study sites. Four levels of N treatments were applied: (1) control (no N added), (2) low-N (50 kg N ha(-1) year(-1)), (3) medium-N (150 kg N ha(-1) year(-1)), and (4) high-N (300 kg N ha(-1) year(-1)), N additions ranging from 40% to 370% of ambient N deposition. The decomposition processes of ten types of forest litters were then studied. Nitrogen additions significantly decreased the decomposition rates of six types of forest litters. N additions decreased forest litter decomposition, and the mass of residual litter was closely correlated to residual lignin during the decomposition process over the study period. The inhibitory effect of N addition on litter decomposition can be primarily explained by the inhibition of lignin decomposition by exogenous inorganic N. The overall decomposition rate of ten investigated substrates exhibited a significant negative linear relationship with initial tissue C/N and lignin/N, and significant positive relationships with initial tissue K and N concentrations; these relationships exhibited linear and logarithmic curves, respectively.<h4>Conclusions/significance</h4>This study suggests that the expected progressive increases in N deposition may have a potential important impact on forest litter decomposition in the study area in the presence of high levels of ambient N deposition.Li-Hua TuHong-Ling HuGang ChenYong PengYin-Long XiaoTing-Xing HuJian ZhangXian-Wei LiLi LiuYi TangPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 2, p e88752 (2014) |
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Medicine R Science Q Li-Hua Tu Hong-Ling Hu Gang Chen Yong Peng Yin-Long Xiao Ting-Xing Hu Jian Zhang Xian-Wei Li Li Liu Yi Tang Nitrogen addition significantly affects forest litter decomposition under high levels of ambient nitrogen deposition. |
| description |
<h4>Background</h4>Forest litter decomposition is a major component of the global carbon (C) budget, and is greatly affected by the atmospheric nitrogen (N) deposition observed globally. However, the effects of N addition on forest litter decomposition, in ecosystems receiving increasingly higher levels of ambient N deposition, are poorly understood.<h4>Methodology/principal findings</h4>We conducted a two-year field experiment in five forests along the western edge of the Sichuan Basin in China, where atmospheric N deposition was up to 82-114 kg N ha(-1) in the study sites. Four levels of N treatments were applied: (1) control (no N added), (2) low-N (50 kg N ha(-1) year(-1)), (3) medium-N (150 kg N ha(-1) year(-1)), and (4) high-N (300 kg N ha(-1) year(-1)), N additions ranging from 40% to 370% of ambient N deposition. The decomposition processes of ten types of forest litters were then studied. Nitrogen additions significantly decreased the decomposition rates of six types of forest litters. N additions decreased forest litter decomposition, and the mass of residual litter was closely correlated to residual lignin during the decomposition process over the study period. The inhibitory effect of N addition on litter decomposition can be primarily explained by the inhibition of lignin decomposition by exogenous inorganic N. The overall decomposition rate of ten investigated substrates exhibited a significant negative linear relationship with initial tissue C/N and lignin/N, and significant positive relationships with initial tissue K and N concentrations; these relationships exhibited linear and logarithmic curves, respectively.<h4>Conclusions/significance</h4>This study suggests that the expected progressive increases in N deposition may have a potential important impact on forest litter decomposition in the study area in the presence of high levels of ambient N deposition. |
| format |
article |
| author |
Li-Hua Tu Hong-Ling Hu Gang Chen Yong Peng Yin-Long Xiao Ting-Xing Hu Jian Zhang Xian-Wei Li Li Liu Yi Tang |
| author_facet |
Li-Hua Tu Hong-Ling Hu Gang Chen Yong Peng Yin-Long Xiao Ting-Xing Hu Jian Zhang Xian-Wei Li Li Liu Yi Tang |
| author_sort |
Li-Hua Tu |
| title |
Nitrogen addition significantly affects forest litter decomposition under high levels of ambient nitrogen deposition. |
| title_short |
Nitrogen addition significantly affects forest litter decomposition under high levels of ambient nitrogen deposition. |
| title_full |
Nitrogen addition significantly affects forest litter decomposition under high levels of ambient nitrogen deposition. |
| title_fullStr |
Nitrogen addition significantly affects forest litter decomposition under high levels of ambient nitrogen deposition. |
| title_full_unstemmed |
Nitrogen addition significantly affects forest litter decomposition under high levels of ambient nitrogen deposition. |
| title_sort |
nitrogen addition significantly affects forest litter decomposition under high levels of ambient nitrogen deposition. |
| publisher |
Public Library of Science (PLoS) |
| publishDate |
2014 |
| url |
https://doaj.org/article/827764485c8241878666b6b3fd32422e |
| work_keys_str_mv |
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