Abstract Increasing atmospheric reactive nitrogen (N) deposition due to human activities could change N cycling in terrestrial ecosystems. However, the differences between the fates of deposited and are still not fully understood. Here, we investigated the fates of deposited and , respectively, via the application of 15 NH 4 NO 3 and NH 4 15 NO 3 in a temperate forest ecosystem. Results showed that at 410 days after tracer application, most was immobilized in litter layer (50 ± 2%), while a considerable amount of penetrated into 0–5 cm mineral soil (42 ± 2%), indicating that litter layer and 0–5 cm mineral soil were the major N sinks of and , respectively. Broad‐leaved trees assimilated more 15 N under NH 4 15 NO 3 treatment compared to under 15 NH 4 NO 3 treatment, indicating their preference for –N. At 410 days after tracer application, 16 ± 4% added 15 N was found in aboveground biomass under treatment, which was twice more than that under treatment (6 ± 1%). At the same time, approximately 80% added 15 N was recovered in soil and plants under both treatments, which suggested that this forest had high potential for retention of deposited N. These results provided evidence that there were great differences between the fates of deposited and , which could help us better understand the mechanisms and capability of forest ecosystems as a sink of reactive nitrogen.

TRACER

Litter

Terrestrial ecosystem

Temperate forest

Reactive nitrogen

Nitrogen Cycle

Sink (geography)

Deposition

Biogeochemical Cycle

10.1111/gcb.13533

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Citations (40)

Responses of soil microbial communities to freeze–thaw cycles in a Chinese temperate forest

Ecological Processes (2021)

Changpeng Sang Zongwei Xia Lifei Sun Hao Sun Ping Jiang

Abstract Background Freeze–thaw events are common in boreal and temperate forest ecosystems and are increasingly influenced by climate warming. Soil microorganisms play an important role in maintaining ecosystem stability, but their responses to freeze–thaw cycles (FTCs) are poorly understood. We conducted a field freeze–thaw experiment in a natural Korean pine and broadleaf mixed forest in the Changbai Mountain Nature Reserve, China, to determine the dynamic responses of soil microbial communities to FTCs. Results Bacteria were more sensitive than fungi to FTCs. Fungal biomass, diversity and community composition were not significantly affected by freeze–thaw regardless of the stage. Moderate initial freeze–thaw resulted in increased bacterial biomass, diversity, and copiotrophic taxa abundance. Subsequent FTCs reduced the bacterial biomass and diversity. Compared with the initial FTC, subsequent FTCs exerted an opposite effect on the direction of change in the composition and function of the bacterial community. Soil water content, dissolved organic carbon, ammonium nitrogen, and total dissolved phosphorus were important factors determining bacterial community diversity and composition during FTCs. Moreover, the functional potentials of the microbial community involved in C and N cycling were also affected by FTCs. Conclusions Different stages of FTCs have different ecological effects on the soil environment and microbial activities. Soil FTCs changed the soil nutrients and water availability and then mainly influenced bacterial community composition, diversity, and functional potentials, which may disturb C and N states in this temperate forest soil. This study also improves our understanding of microbial communities regulating their ecological functions in response to climate change.

Terrestrial ecosystem

10.1186/s13717-021-00337-x

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Citations (34)

Investigation of N<SUB>2</SUB>O and CH<SUB>4</SUB> Emissions from Plants

CHINESE BULLETIN OF BOTANY (2012)

Zhang Xiu-jun Jiang Pi-wen Zhu Hai Dong Dan Zongwei Xia

10.3724/sp.j.1259.2012.00120

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Citations (0)

Soil resource status affects the responses of nitrogen processes to changes in temperature and moisture

Biology and Fertility of Soils (2019)