Dataset Information

Nitrogen and phosphorus addition impact soil N?O emission in a secondary tropical forest of South China.

ABSTRACT: Nutrient availability greatly regulates ecosystem processes and functions of tropical forests. However, few studies have explored impacts of N addition (aN), P addition (aP) and N × P interaction on tropical forests N?O fluxes. We established an N and P addition experiment in a tropical forest to test whether: (1) N addition would increase N?O emission and nitrification, and (2) P addition would increase N?O emission and N transformations. Nitrogen and P addition had no effect on N mineralization and nitrification. Soil microbial biomass was increased following P addition in wet seasons. aN increased 39% N?O emission as compared to control (43.3 ?gN?O-N m(-2)h(-1)). aP did not increase N?O emission. Overall, N?O emission was 60% greater for aNP relative to the control, but significant difference was observed only in wet seasons, when N?O emission was 78% greater for aNP relative to the control. Our results suggested that increasing N deposition will enhance soil N?O emission, and there would be N × P interaction on N?O emission in wet seasons. Given elevated N deposition in future, P addition in this tropical soil will stimulate soil microbial activities in wet seasons, which will further enhance soil N?O emission.

SUBMITTER: Wang F

PROVIDER: S-EPMC4085593 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature

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Nitrogen and phosphorus addition impact soil N₂O emission in a secondary tropical forest of South China.

Wang Faming F Li Jian J Wang Xiaoli X Zhang Wei W Zou Bi B Neher Deborah A DA Li Zhian Z

Scientific reports 20140708

Nutrient availability greatly regulates ecosystem processes and functions of tropical forests. However, few studies have explored impacts of N addition (aN), P addition (aP) and N × P interaction on tropical forests N₂O fluxes. We established an N and P addition experiment in a tropical forest to test whether: (1) N addition would increase N₂O emission and nitrification, and (2) P addition would increase N₂O emission and N transformations. Nitrogen and P addition had no effect on N mineralizatio ...[more]

PMID: 25001013

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Project description:Soil microbial responses to anthropogenic nitrogen (N) enrichment at the overall community level has been extensively studied. However, the responses of community dynamics and assembly processes of the abundant versus rare bacterial taxa to N enrichment have rarely been assessed. Here, we present a study in which the effects of short- (2 years) and long-term (13 years) N additions to two nearby tropical forest sites on abundant and rare soil bacterial community composition and assembly were documented. The N addition, particularly in the long-term experiment, significantly decreased the bacterial α-diversity and shifted the community composition toward copiotrophic and N-sensitive species. The α-diversity and community composition of the rare taxa were more affected, and they were more closely clustered phylogenetically under N addition compared to the abundant taxa, suggesting the community assembly of the rare taxa was more governed by deterministic processes (e.g., environmental filtering). In contrast, the abundant taxa exhibited higher community abundance, broader environmental thresholds, and stronger phylogenetic signals under environmental changes than the rare taxa. Overall, these findings illustrate that the abundant and rare bacterial taxa respond distinctly to N addition in tropical forests, with higher sensitivity of the rare taxa, but potentially broader environmental acclimation of the abundant taxa. IMPORTANCE Atmospheric nitrogen (N) deposition is a worldwide environmental problem and threatens biodiversity and ecosystem functioning. Understanding the responses of community dynamics and assembly processes of abundant and rare soil bacterial taxa to anthropogenic N enrichment is vital for the management of N-polluted forest soils. Our sequence-based data revealed distinct responses in bacterial diversity, community composition, environmental acclimation, and assembly processes between abundant and rare taxa under N-addition soils in tropical forests. These findings provide new insight into the formation and maintenance of bacterial diversity and offer a way to better predict bacterial responses to the ongoing atmospheric N deposition in tropical forests.

Dataset Information

Nitrogen and phosphorus addition impact soil N?O emission in a secondary tropical forest of South China.

Publications

Nitrogen and phosphorus addition impact soil N₂O emission in a secondary tropical forest of South China.

Similar Datasets

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