Short-term response of soil respiration to nitrogen fertilization in a subtropical evergreen forest

Gao, Qiang; Hasselquist, Niles J.; Palmroth, Sari; Zheng, Zhoutao; Wang, You

doi:10.1016/j.soilbio.2014.04.020

Cited by 82 publications

(35 citation statements)

References 18 publications

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“…In the more recent studies, it was reported that the effects of N addition on R s highly depended on the amount of N added (Gao et al. ) and soil N content (Janssens et al. ).…”

Section: Introductionmentioning

confidence: 99%

The impacts of precipitation increase and nitrogen addition on soil respiration in a semiarid temperate steppe

et al. 2017

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. 2017. The impacts of precipitation increase and nitrogen addition on soil respiration in a semiarid temperate steppe. Ecosphere 8(1):e01655. 10.1002/ecs2. 1655Abstract. Soil respiration, R s , is strongly controlled by water availability in semiarid grasslands. However, how R s is affected by precipitation change (either as rainfall or as snowfall) especially under increasing nitrogen (N) deposition has been uncertain. A manipulative experiment to investigate the responses of growing season R s to changes in spring snowfall or summer rainfall with or without N addition was conducted in the semiarid temperate steppe of China during three hydrologically contrasting years. Our results showed that both spring snow addition and summer water addition significantly increased R s by increasing soil moisture. The effect of spring snow addition only occurred in years with both relatively lower natural snowfall and later snowmelt time. Summer water addition showed a much stronger effect on R s by increasing plant root growth and microbial activities, but the magnitude also largely depended on the possible legacy effect of previous year precipitation. Our results indicated that precipitation increase in the form of snowfall had weaker effects than that in the form of rainfall as the former only accounted for less than 30% of total precipitation. Compared with other ecosystem processes, R s was less responsible for increase in N deposition as it did not increase root productivity and microbial activities in the soils. Our results provided field data constraints for modeling the ecosystem carbon balance under the future global change scenarios in semiarid grasslands.

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“…In the more recent studies, it was reported that the effects of N addition on R s highly depended on the amount of N added (Gao et al. ) and soil N content (Janssens et al. ).…”

Section: Introductionmentioning

confidence: 99%

The impacts of precipitation increase and nitrogen addition on soil respiration in a semiarid temperate steppe

et al. 2017

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“…Generally, a large number of field and laboratory studies have examined the effect of N addition on Rs by periodic measurements of the respiratory processes. Measurements of Rs after N addition varied across studies, and the majority of sample interval from one week to one month after N addition [18][19][20]. However, an examination of how sampling interval affects Rs and investigation into the duration of this effect after N addition received little attention.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nitrogen Addition on Soil Respiration in a Larch Plantation

Zhu

Chen

Cheng

et al. 2017

Pol. J. Environ. Stud.

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Knowledge about the impact of nitrogen (N) addition on soil respiration (Rs) is critical for understanding soil carbon (C) balance and its responses to climate change. We conducted a long-term field experiment to evaluate the response of Rs to N addition in a larch (Larix principis-rupprechtii) plantation during the growing season in northern China. We applied four N (in the form of NH 4 NO 3 ) levels, i. ) monthly starting in June 2015. The results showed that N addition -especially N2 and N3 levels -significantly stimulated Rs. N1 and N2 levels resulted in the increase of Rs in a short time, whereas the duration of N3 level can last across the whole month or at least 10 days. The results highlight the need for improving the Rs sampling interval after N addition to ensure more accurate evaluation of C emission. Soil temperature and soil moisture together explained more variations of Rs. N addition exhibited a slight increase in the sensitivity of Rs to temperature (Q 10 ), but no significant differences were found for the Q 10 among N levels.

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“…Greater photosynthesis resulting from N addition led to significant increases in fine-root, coarse-root, leaf and stem biomass (Table 2). Therefore, the N-induced enhancement of R A was due to increased photosynthesis, which might have supplied more carbon photosynthate for root and soil microbial activities (Carreiro et al 2000;Xu and Wan 2008;Yan et al 2010;Gao et al 2014). The reduction in R H after fertilization presumably resulted from the additional N retarding the decomposition of soil organic material by altering soil microbial communities (Allison et al 2008) or limiting soil Values are mean ± SD (n = 4).…”

Section: Resultsmentioning

confidence: 99%

“…Phillips and Fahey (2007) presented evidence that decreased SR was due to the reduction of R H in fertilized forest soils, while Olsson et al (2005) attributed it to a decrease in R A . Addition of N influences photosynthate supply (Xu and Wan 2008;Gao et al 2014). Thus the conflicting responses of SR after addition of N could derive from varying levels of photosynthate supply for R A .…”

Section: Introductionmentioning

confidence: 99%

Photosynthate supply drives soil respiration of Fraxinus mandshurica seedlings in northeastern China: evidences from a shading and nitrogen addition experiment

Jing

Guan

et al. 2016

J. For. Res.

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Improved understanding of the link between photosynthesis and below-ground processes is needed to better understand ecosystem carbon (C) cycling and its feedback to climate change. We conducted a short-term shading and nitrogen (N) addition experiment from June to September 2013 to investigate the effect of photosynthate supply by Manchurian Ash (Fraxinus mandshurica) seedlings on soil respiration (SR). Shading significantly reduced SR in early and middle growing season, but not in late growing season, leading to a decrease in mean SR by 24 % in N-unfertilized treatments. N addition increased mean SR by 42 % in un-shaded treatment. The stimulation of SR was largely attributed to accelerated autotrophic respiration by increasing photosynthesis, leaf area index and belowground biomass. Shading reduced mean SR by 32 % in N addition treatment. The strengthened shading effect on SR resulted from N addition was because of more photosynthates supply at low soil temperature. Our findings highlight the predominance of photosynthates supply in regulating the responses of C cycling to global change.

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Short-term response of soil respiration to nitrogen fertilization in a subtropical evergreen forest

Cited by 82 publications

References 18 publications

The impacts of precipitation increase and nitrogen addition on soil respiration in a semiarid temperate steppe

The impacts of precipitation increase and nitrogen addition on soil respiration in a semiarid temperate steppe

Effect of Nitrogen Addition on Soil Respiration in a Larch Plantation

Photosynthate supply drives soil respiration of Fraxinus mandshurica seedlings in northeastern China: evidences from a shading and nitrogen addition experiment

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