Gao Wenlong; Yang Hao; Li Shenggong; Kou Liang
Source Publicationjournalofresourcesandecology
AbstractUnderstanding how nitrogen (N) availability interacts with soil acidity and phosphorus (P) availability to affect soil-atmosphere exchanges in CO_2, CH_4 and N_2O 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 CO_2, CH_4 and N_2O exchange under N addition. Our results showed that soil NH_4~+-N and NO_3~--N increased after N addition, but CO_2 emissions in N addition plots remained unaffected. CH_4 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. CH_4 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 CH_4 uptake. N_2O emission in N–, NP–, NH– and NPH–addition plots increased by 158.6%, 176.0%, 117.2%, and 91.8%, respectively. N_2O 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 N_2O 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 CH_4 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 N_2O emissions by N deposition.
Document Type期刊论文
First Author Affilication中国科学院地理科学与资源研究所
Recommended Citation
GB/T 7714
Gao Wenlong,Yang Hao,Li Shenggong,et al. responsesofsoilco2ch4andn2ofluxestonpandacidadditionsinmixedforestinsubtropicalchina[J]. journalofresourcesandecology,2017,8(2):154.
APA Gao Wenlong,Yang Hao,Li Shenggong,&Kou Liang.(2017).responsesofsoilco2ch4andn2ofluxestonpandacidadditionsinmixedforestinsubtropicalchina.journalofresourcesandecology,8(2),154.
MLA Gao Wenlong,et al."responsesofsoilco2ch4andn2ofluxestonpandacidadditionsinmixedforestinsubtropicalchina".journalofresourcesandecology 8.2(2017):154.
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