Responses of net ecosystem carbon budget and net global warming potential to long-term nitrogen deposition in a temperate grassland

A - Papers appearing in refereed journals

Chen, S., Yue, P., Hao, T., Li, K., Misselbrook, T. H. and Liu, X. 2023. Responses of net ecosystem carbon budget and net global warming potential to long-term nitrogen deposition in a temperate grassland. Catena. 225 (May 15), p. 107015. https://doi.org/10.1016/j.catena.2023.107015

AuthorsChen, S., Yue, P., Hao, T., Li, K., Misselbrook, T. H. and Liu, X.
Abstract

Grassland systems are important terrestrial carbon sinks and have great potential for carbon (C) sequestration. Increased atmospheric nitrogen (N) deposition has profoundly affected C balance and greenhouse gas emissions in grassland systems. However, the effects of long-term nitrogen (LN) deposition on net ecosystem carbon budget (NECB) and net global warming potential (NGWP) in grassland systems are still not clearly understood. A field experiment was conducted to test the effect of LN addition (0, 30, 60, 120 and 240 kg N ha(-1) yr(-1)) on NECB and NGWP in a temperate grassland area in Inner Mongolia, China. LN addition significantly increased soil organic carbon density (SOCD) and C sequestration in surface soil (0-30 cm) with the increase of N addition rate from 2005 to 2018. In contrast, a decrease in ecosystem respiration (R-e) was observed, except at low LN concentration (30 kg N ha(-1) yr(-1)). Annual N2O flux was significantly increased, and the CH4 sink was significantly decreased by LN addition. NECB and NGWP were relatively weak in this temperate grassland, ranging from -627.29 +/- 198.81 and -232.87 +/- 23.11 kg CO2 ha(-1) yr(-1), respectively, and significantly decreased with increasing LN application. The offset effect of N2O emission to ecosystem C uptake decreased significantly with increased LN addition, and was stable at high LN addition. This was related to the increase in soil C sequestration due to plant C uptake. These results indicate that LN addition significantly decreased the NECB and NGWP of this grassland. Increased long-term N deposition significantly enhanced soil C sequestration, which has important implications for mitigating climate warming.

KeywordsGreenhouse gas fluxes; Carbon sequestration; Long-term nitrogen deposition; Temperate grassland
Year of Publication2023
JournalCatena
Journal citation225 (May 15), p. 107015
Digital Object Identifier (DOI)https://doi.org/10.1016/j.catena.2023.107015
Open accessPublished as non-open access
FunderNational Natural Science Foundation of China
Output statusPublished
Publication dates
Online24 Feb 2023
Publication process dates
Accepted12 Feb 2023
PublisherElsevier Science Bv
ISSN0341-8162

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