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1 March 2017 Responses of Soil CO2, CH4 and N2O Fluxes to N, P, and Acid Additions in Mixed Forest in Subtropical China
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Abstract

Understanding how nitrogen (N) availability interacts with soil acidity and phosphorus (P) availability to affect soil-atmosphere exchanges in CO2, CH4 and N2O in forest ecosystems is important for understanding the mechanisms driving ecosystem responses to enhanced N deposition. Here, we conducted an experiment with N, P and acid (H) addition in a mixed forest in subtropical China to investigate how acid and P addition affects CO2, CH4 and N2O exchange under N addition. Our results showed that soil fi01_154.gif-N and fi02_154.gif-N increased after N addition, but CO2 emissions in N addition plots remained unaffected. CH4 uptake in N-, P-, NP-, NH- and NPH-addition plots were reduced by 21.1%, 15.7%, 39.1%, 26.6%, and 28.4%, respectively. CH4 uptake in NP-addition plots were lower compared to N-addition and P-addition plots, indicating that N and P addition had an additive effect on inhibiting CH4 uptake. N2O emission in N-, NP-, NH- and NPH-addition plots increased by 158.6%, 176.0%, 117.2%, and 91.8%, respectively. N2O emissions in NPH-addition plots were lower compared to NP-addition plots while showed no difference between N-addition and NH-addition plots. This suggests that only under P rich conditions, acid addition would greatly mitigate N2O emissions under N addition. Our results demonstrate that for N and P co-limited forest ecosystems with acidic soils, low P availability constrains the inhibition of soil CH4 uptake by N deposition. When P availability is low, a weak soil acidation induced by N deposition may have less influence on the stimulation of N2O emissions by N deposition.

Gao Wenlong, Yang Hao, Li Shenggong, and Kou Liang "Responses of Soil CO2, CH4 and N2O Fluxes to N, P, and Acid Additions in Mixed Forest in Subtropical China," Journal of Resources and Ecology 8(2), 154-164, (1 March 2017). https://doi.org/10.5814/j.issn.1674-764X.2017.02.006
Received: 2 November 2016; Accepted: 1 February 2017; Published: 1 March 2017
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