Effects of simulated nitrogen deposition on litterfall carbon and nitrogen fractions in a monsoon evergreen broad-leaved forest

LI Dengfeng; ZHANG Jiaen; LIU Ziqiang; WANG Chi; YUAN Ai; WEI Hui

doi:10.7671/j.issn.1001-411X.2018.06.011

Journal of South China Agricultural University > 2018 > 39(6): 70-76. > DOI: 10.7671/j.issn.1001-411X.2018.06.011

LI Dengfeng, ZHANG Jiaen, LIU Ziqiang, WANG Chi, YUAN Ai, WEI Hui. Effects of simulated nitrogen deposition on litterfall carbon and nitrogen fractions in a monsoon evergreen broad-leaved forest[J]. Journal of South China Agricultural University, 2018, 39(6): 70-76. DOI: 10.7671/j.issn.1001-411X.2018.06.011

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Effects of simulated nitrogen deposition on litterfall carbon and nitrogen fractions in a monsoon evergreen broad-leaved forest

LI Dengfeng^1,,
ZHANG Jiaen^{1, 2, ,},
LIU Ziqiang¹,
WANG Chi¹,
YUAN Ai¹,
WEI Hui^{1, 2, ,}

1.
College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
2.
Key Laboratory of Agro-environment in the Tropics, Ministry of Agriculture/Guangdong Engineering Research Center for Modern Eco-agriculture and Circular Agriculture,Guangzhou 510642, China

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Received Date: March 17, 2018
Available Online: May 18, 2023

Graphical Abstract

Abstract

Abstract

Objective
To investigate responses of litterfall carbon (C) and nitrogen (N) fractions to atmospheric N deposition in a monsoon evergreen broad-leaved forest.

Method
Three levels of N addition, including low N (LN, 35 kg·hm^–2), medium N (MN, 70 kg·hm^–2) and high N (HN, 105 kg·hm^–2), were conducted for two years, with a control without extra N addition (CK). Fresh litterfall samples were collected in the dry and wet seasons, respectively. C and N fraction contents were analyzed.

Result
N additions significantly increased the contents of total organic carbon (TOC) and water-soluble organic carbon (WSOC) in the wet season, with the WSOC/TOC ratio presenting a rising trend. N additions did not significantly alter acid-insoluble fraction carbon (AIFC) content and its proportion to TOC, although a decreasing trend was observed compared with the control. Different N addition treatments did not significantly change the contents of litterfall total nitrogen (TN), water-soluble nitrogen (WSN) and acid-insoluble fraction nitrogen (AIFN). The proportions of WSN and AIFN to TN were not altered significantly either. The short-term N additions did not significantly affect litterfall C/N ratio and AIFC/AIFN ratio, but significantly increased WSOC/WSN ratio in the dry season.

Conclusion
The atmospheric N deposition promotes labile C accumulation and therefore is beneficial for litterfall decomposition to transfer nutrients into soil, which will further affect nutrient cycling in the tropical forest.
- nitrogen deposition,
- litter nutrient,
- carbon fraction,
- nitrogen fraction,
- monsoon evergreen broad-leaved forest,
- tropical forest

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References

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