Kou Liang; Zhang Xinyu; Wang Huimin; Yang Hao; Zhao Wei; Li Shenggong
Source Publicationjournalofforestryresearch
AbstractPlantation forests play a pivotal role in carbon sequestration in terrestrial ecosystems, but enhanced nitrogen (N) deposition in these forests may affect plantation productivity by altering soil N cycling. Hence, understanding how simulated N deposition affects the rate and direction of soil N transformation is critically important in predicting responses of plantation productivity in the context of N loading. This study reports the effects of N addition rate (0, 40, and 120kgNha(-1)a(-1)) and form (NH4Cl vs. NaNO3) on net N mineralization and nitrification estimated by in situ soil core incubation and on-soil microbial biomass determined by the phospholipid fatty acid (PLFA) method in a subtropical pine plantation. N additions had no influences on net N mineralization throughout the year. Net nitrification rate was significantly reduced by additions of both NH4Cl (71.5) and NaNO3 (47.1%) during the active growing season, with the stronger inhibitory effect at high N rates. Soil pH was markedly decreased by 0.16 units by NH4Cl additions. N inputs significantly decreased the ratio of fungal-to-bacterial PLFAs on average by 0.28 (49.1%) in November. Under NH4Cl additions, nitrification was positively related with fungal biomass and soil pH. Under NaNO3 additions, nitrification was positively related with all microbial groups except for bacterial biomass. We conclude that simulated N deposition inhibited net nitrification in the acidic soils of a subtropical plantation forest in China, primarily due to accelerated soil acidification and compositional shifts in microbial functional groups. These findings may facilitate a better mechanistic understanding of soil N cycling in the context of N loading.
Funding Project[National Key Research and Development Plan] ; [National Natural Science Foundation of China]
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
Kou Liang,Zhang Xinyu,Wang Huimin,et al. nitrogenadditionsinhibitnitrificationinacidicsoilsinasubtropicalpineplantationeffectsofsoilphandcompositionalshiftsinmicrobialgroups[J]. journalofforestryresearch,2019,30(2):669.
APA Kou Liang,Zhang Xinyu,Wang Huimin,Yang Hao,Zhao Wei,&Li Shenggong.(2019).nitrogenadditionsinhibitnitrificationinacidicsoilsinasubtropicalpineplantationeffectsofsoilphandcompositionalshiftsinmicrobialgroups.journalofforestryresearch,30(2),669.
MLA Kou Liang,et al."nitrogenadditionsinhibitnitrificationinacidicsoilsinasubtropicalpineplantationeffectsofsoilphandcompositionalshiftsinmicrobialgroups".journalofforestryresearch 30.2(2019):669.
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