Effect of chronic nitrogen fertilization on soil CO2 flux in a temperate forest in North China: a 5-year nitrogen addition experiment

Wang, Chunmei; Yang, Xintong; Xu, Ke

doi:10.1007/s11368-017-1760-y

Cited by 17 publications

(16 citation statements)

References 61 publications

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“…Previous research has reported that N deposition suppressed [6,7], stimulated [15,16], or had no effect [17,18] on R S . These contradicting findings regarding the responses of R S to N deposition are probably caused by different N deposition forms and levels [19] and the initial soil N status [20]. Thus, detailed research is required to understand the impact of N deposition on R S and its control mechanism.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nitrogen Additions on Soil Respiration in an Asian Tropical Montane Rainforest

Peng

Liu

et al. 2021

Forests

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Understanding the impacts of nitrogen (N) addition on soil respiration (RS) and its temperature sensitivity (Q10) in tropical forests is very important for the global carbon cycle in a changing environment. Here, we investigated how RS respond to N addition in a tropical montane rainforest in Southern China. Four levels of N treatments (0, 25, 50, and 100 kg N ha−1 a−1 as control (CK), low N (N25), moderate N (N50), and high N (N100), respectively) were established in September 2010. Based on a static chamber-gas chromatography method, RS was measured from January 2015 to December 2018. RS exhibited significant seasonal variability, with low RS rates appeared in the dry season and high rates appeared in the wet season regardless of treatment. RS was significantly related to the measured soil temperature and moisture. Our results showed that soil RS increased after N additions, the mean annual RS was 7% higher in N25 plots, 8% higher in N50 plots, and 11% higher in N100 plots than that in the CK plots. However, the overall impacts of N additions on RS were statistically insignificant. For the entire study period, the CK, N25, N50, and N100 treatments yielded Q10 values of 2.27, 3.45, 4.11, and 2.94, respectively. N addition increased the temperature sensitivity (Q10) of RS. Our results suggest that increasing atmospheric N deposition may have a large impact on the stimulation of soil CO2 emissions from tropical rainforests in China.

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Section: Introductionmentioning

confidence: 99%

Effects of Nitrogen Additions on Soil Respiration in an Asian Tropical Montane Rainforest

Peng

Liu

et al. 2021

Forests

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“…Therefore, canopy N deposition may overcome these limitations of understory N deposition. Moreover, most of the previous studies used NaNO 3 [22,23], (NH 4 ) 2 SO 4 [23,24], NH 4 Cl [25], and NH 4 NO 3 [26] as a single N source to stimulating N deposition. However, atmospheric N deposition contains different N forms, e.g., NH x and NO y [1].…”

Section: Introductionmentioning

confidence: 99%

Consistent Effects of Canopy vs. Understory Nitrogen Addition on Soil Respiration and Net Ecosystem Production in Moso Bamboo Forests

Cai

Yang

Liang

et al. 2021

Forests

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Nitrogen (N) deposition has been well documented to cause substantial impacts on ecosystem carbon cycling. However, the majority studies of stimulating N deposition by direct N addition to forest floor have neglected some key ecological processes in forest canopy (e.g., N retention and absorption) and might not fully represent realistic atmospheric N deposition and its effects on ecosystem carbon cycling. In this study, we stimulated both canopy and understory N deposition (50 and 100 kg N ha−1 year−1) with a local atmospheric NHx:NOy ratio of 2.08:1, aiming to assess whether canopy and understory N deposition had similar effects on soil respiration (RS) and net ecosystem production (NEP) in Moso bamboo forests. Results showed that RS, soil autotrophic (RA), and heterotrophic respiration (RH) were 2971 ± 597, 1472 ± 579, and 1499 ± 56 g CO2 m−2 year−1 for sites without N deposition (CN0), respectively. Canopy and understory N deposition did not significantly affect RS, RA, and RH, and the effects of canopy and understory N deposition on these soil fluxes were similar. NEP was 1940 ± 826 g CO2 m−2 year−1 for CN0, which was a carbon sink, indicating that Moso bamboo forest the potential to play an important role alleviating global climate change. Meanwhile, the effects of canopy and understory N deposition on NEP were similar. These findings did not support the previous predictions postulating that understory N deposition would overestimate the effects of N deposition on carbon cycling. However, due to the limitation of short duration of N deposition, an increase in the duration of N deposition manipulation is urgent and essential to enhance our understanding of the role of canopy processes in ecosystem carbon fluxes in the future.

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“…Soil N 2 O emission measurements were performed three times in the first week of each month, from March 2011 to February 2016. Soil N 2 O emissions were measured using a static closed opaque chamber and gas chromatography method [ 32 ]. The chamber was made of stainless steel and consisted of a fixed base and a removable top (without bottom, length × width × height = 50 cm × 50 cm × 50 cm).…”

Section: Methodsmentioning

confidence: 99%

Five-year study of the effects of simulated nitrogen deposition levels and forms on soil nitrous oxide emissions from a temperate forest in northern China

Wang

Yang

2017

PLoS ONE

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Few studies have quantified the effects of different levels and forms of nitrogen (N) deposition on soil nitrous oxide (N2O) emissions from temperate forest soils. A 5-year field experiment was conducted to investigate the effects of multiple forms and levels of N additions on soil N2O emissions, by using the static closed chamber method at Xi Mountain Experimental Forest Station in northern China. The experiment included a control (no N added), and additions of NH4NO3, NaNO3, and (NH4)2SO4 that each had two levels: 50 kg N ha−1 yr−1 and 150 kg N ha−1 yr−1. All plots were treated to simulate increased N deposition on a monthly schedule during the annual growing season (March to October) and soil N2O emissions were measured monthly from March 2011 to February 2016. Simultaneously, the temperature, moisture, and inorganic N contents of soil were also measured to explore how the main factors may have affected soil N2O emission. The results showed that the types and levels of N addition significantly increased soil inorganic N contents, and the accumulation of soil NO3–-N was significantly higher than that of soil NH4+–N due to N addition. The three N forms significantly increased the average N2O emissions (P < 0.05) in the order of NH4NO3 > (NH4)2SO4 > NaNO3 by 355.95%, 266.35%, and 187.71%, respectively, compared with control. The promotion of N2O emission via the NH4+–N addition was significantly more than that via the NO3––N addition, while N addition at a high level exerted a stronger effect than at the low-level. N addition exerted significantly stronger effects on cumulative N2O emissions in the initial years, especially the third year when the increased cumulative N2O emission reached their maximum. In the later years, the increases persisted but were weakened. Increasing inorganic N concentration could change soil from being N-limited to N-rich, and then N-saturated, and so the promotion on soil available N effect increased and then decreased. Moreover, the soil NH4+–N, NO3–-N, temperature, and water-filled pore space were all positively correlated with soil N2O emissions. These findings suggest that atmospheric N deposition can significantly promote soil N2O emission, and that exogenous NH4+–N and NO3–-N inputs into temperate forests can have synergic effects on soil N2O emission. In future research, both aspects should be better distinguished in the N cycle and balance of terrestrial ecosystems by using 15N tracer methods.

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Effect of chronic nitrogen fertilization on soil CO2 flux in a temperate forest in North China: a 5-year nitrogen addition experiment

Cited by 17 publications

References 61 publications

Effects of Nitrogen Additions on Soil Respiration in an Asian Tropical Montane Rainforest

Effects of Nitrogen Additions on Soil Respiration in an Asian Tropical Montane Rainforest

Consistent Effects of Canopy vs. Understory Nitrogen Addition on Soil Respiration and Net Ecosystem Production in Moso Bamboo Forests

Five-year study of the effects of simulated nitrogen deposition levels and forms on soil nitrous oxide emissions from a temperate forest in northern China

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