Differential response of soil respiration to nitrogen and phosphorus addition in a highly phosphorus-limited subtropical forest, China

Liu, Heming; Zhou, Guiyao; Bai, Shahla Hosseini; Jin, Zhen; Shang, Yijing; He, Miao; Wang, Xihua; Zheng, Zhoutao

doi:10.1016/j.foreco.2019.06.020

Cited by 28 publications

(16 citation statements)

References 39 publications

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“…The study region is water‐limited based on the global relationship between precipitation and net primary productivity (NPP; Taylor et al, 2017). The soil at our site is an Acrisol, with a pH ranging from 4.4 to 5.1 (Liu, Zhou, Bai, et al, 2019). The soil has a clay loam texture with 6.8% sand, 55.5% silt and 37.7% clay (Liu, Zhou, Bai, et al, 2019; Yan et al, 2006).…”

Section: Methodsmentioning

confidence: 99%

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Soil fungi and fine root biomass mediate drought‐induced reductions in soil respiration

Zhou

Liu

et al. 2020

Functional Ecology

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1. Climate change has increased the frequency and intensity of droughts, with potential impacts on carbon (C) release from soil (i.e. soil respiration, Rs). Although numerous studies have investigated drought-induced changes in Rs, how roots and the soil microbial community regulate responses of Rs to drought remains unclear. 2. We conducted a 4-year field experiment (2014-2017) with three treatments (i.e. 70% rainfall reduction, control and ambient) in a subtropical forest to examine effects of drought on Rs and its components [i.e. autotrophic (Ra) and heterotrophic respiration (Rh)] and explore the mechanisms underlying these effects. 3. Drought significantly decreased Rs by 17% averaged over the 4 years, but it had no significant effect in the first experimental year. The decrease in Rs was mediated by soil fungi and fine root biomass. Fine root biomass was correlated negatively with Ra and Rs under drought, but positively in the control treatment. Furthermore, drought treatments increased physiological stress in the bacterial community. Structural equation model (SEM) analysis suggested that under drought conditions, microclimate affected Rs via its impact on fine root biomass and fungal biomass. 4. Our results highlight the complex interactions between microclimate, roots and soil microbes in regulating Rs under drought in subtropical forest ecosystems. Incorporating these interactions into land surface models may improve predictions of climate change impacts on forest ecosystems. K E Y W O R D S C-climate feedback, CO 2 emission, drought, fine root biomass, fungi community, physiological stress, structural equation model 1 | INTRODUC TI ON Earth system models predict that global hydrological cycles will intensify in the next decades (IPCC, 2013), thereby altering the frequency and intensity of precipitation around the world (IPCC, 2013). Consequently, several regions will experience increased droughts, which threaten the biodiversity and stability of terrestrial ecosystems and alter ecosystem structure and function | 2635 Functional Ecology ZHOU et al.

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Section: Methodsmentioning

confidence: 99%

“…The soil at our site is an Acrisol, with a pH ranging from 4.4 to 5.1 (Liu, Zhou, Bai, et al, 2019). The soil has a clay loam texture with 6.8% sand, 55.5% silt and 37.7% clay (Liu, Zhou, Bai, et al, 2019; Yan et al, 2006). Dominant tree species include Schima superba , Castanopsis fargesii and Lithocarpus glaber .…”

Section: Methodsmentioning

confidence: 99%

Soil fungi and fine root biomass mediate drought‐induced reductions in soil respiration

Zhou

Liu

et al. 2020

Functional Ecology

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“…Such discrepancies are largely ascribed to the different sensitivities of plant roots and soil micro-organisms to N enrichment, resulting in uncertainties and inconsistent results of R a and R h in response to N enrichment. For instance, a global meta-analysis has reported that N addition generally decreases R h in diverse ecosystems (Zhang et al 2018), which is likely due to decreased soil microbial biomass, suppression of extracellular enzyme activities, and changes in microbial composition that may increase microbial C use efficiency (Li et al 2018;Wang et al 2018;Zhang et al 2018;Liu et al 2019;Ma et al 2020). In contrast, the response of R a to N enrichment is disparate.…”

Section: Introductionmentioning

confidence: 99%

Different responses of soil respiration and its components to nitrogen and phosphorus addition in a subtropical secondary forest

Chen

Tian

2021

For. Ecosyst.

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Background Nitrogen (N) and phosphorus (P) deposition have largely affected soil respiration (Rs) in forest ecosystems. However, few studies have explored how N and P individually or in combination to influence Rs and its components (autotrophic respiration, Ra; heterotrophic respiration, Rh), especially in highly P-limited subtropical forests. To address this question, we conducted a field manipulation experiment with N and/or P addition in a 50-year-old subtropical secondary forest. Results We found that N addition on average reduced Rs, Ra, and Rh by 15.2%, 15%, and 11.7%, respectively during 2-year field study. P addition had an inconsistent effect on Ra, with Ra increasing by 50.5% in the first year but reducing by 26.6% in the second year. Moreover, P addition on average decreased Rh by 8.9%–30.9% and Rs by 6.7%–15.6% across 2 years. In contrast, N and P co-addition on average increased Rs, Ra, and Rh by 1.9%, 7.9%, and 2.1% during the experimental period. Though Rs and Rh were significantly correlated with soil temperature, their temperature sensitivities were not significantly changed by fertilization. Ra was predominantly regulated by soil nitrogen availability (NH4+ and NO3−), soil dissolved organic carbon (DOC), and enzyme activities, while the variation in Rh was mainly attributable to changes in soil microbial community composition and soil β-D-Cellubiosidase (CB) and β-Xylosidase (XYL) activities. Conclusion Our findings highlight the contrasting responses of Rs and its components to N or P addition against N and P co-addition, which should be differentially considered in biogeochemical models in order to improve prediction of forest carbon dynamics in the context of N and P enrichment in terrestrial ecosystems.

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“…In tropical forests, N deposition reduces soil CO 2 emissions (Mo et al 2008;Cusack et al 2011;Tian et al 2019); enhances (Zhang et al 2008b;Wang et al 2014;Tian et al 2019) or has no effect (Zhang et al 2008b;Müller et al 2015;Tang et al 2018) on soil N 2 O emissions; and inhibits or has no effect on soil CH 4 uptake (Zhang et al 2012). N deposition was shown to promote soil N 2 O emissions in an N-saturated forest (Xie et al 2018), while it increased soil CO 2 emissions in a bamboo ecosystem (Tu et al 2013), an evergreen forest (Gao et al 2014), and a highly P-limited forest (Liu et al 2019). Additionally, Wang et al (2015) found that N deposition promoted soil N 2 O emissions but reduced soil CH 4 uptake in a slash pine plantation.…”

Section: Introductionmentioning

confidence: 99%

Management scheme influence and nitrogen addition effects on soil CO2, CH4, and N2O fluxes in a Moso bamboo plantation

Zhang

et al. 2021

For. Ecosyst.

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Background It is still not clear whether the effects of N deposition on soil greenhouse gas (GHG) emissions are influenced by plantation management schemes. A field experiment was conducted to investigate the effects of conventional management (CM) versus intensive management (IM), in combination with simulated N deposition levels of control (ambient N deposition), 30 kg N·ha− 1·year− 1 (N30, ambient + 30 kg N·ha− 1·year− 1), 60 kg N·ha− 1·year− 1 (N60, ambient + 60 kg N·ha− 1·year− 1), or 90 kg N·ha− 1·year− 1 (N90, ambient + 90 kg N·ha− 1·year− 1) on soil CO2, CH4, and N2O fluxes. For this, 24 plots were set up in a Moso bamboo (Phyllostachys edulis) plantation from January 2013 to December 2015. Gas samples were collected monthly from January 2015 to December 2015. Results Compared with CM, IM significantly increased soil CO2 emissions and their temperature sensitivity (Q10) but had no significant effects on soil CH4 uptake or N2O emissions. In the CM plots, N30 and N60 significantly increased soil CO2 emissions, while N60 and N90 significantly increased soil N2O emissions. In the IM plots, N30 and N60 significantly increased soil CO2 and N2O emissions, while N60 and N90 significantly decreased soil CH4 uptake. Overall, in both CM and IM plots, N30 and N60 significantly increased global warming potentials, whereas N90 did not significantly affect global warming potential. However, N addition significantly decreased the Q10 value of soil CO2 emissions under IM but not under CM. Soil microbial biomass carbon was significantly and positively correlated with soil CO2 and N2O emissions but significantly and negatively correlated with soil CH4 uptake. Conclusion Our results indicate that management scheme effects should be considered when assessing the effect of atmospheric N deposition on GHG emissions in bamboo plantations.

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Differential response of soil respiration to nitrogen and phosphorus addition in a highly phosphorus-limited subtropical forest, China

Cited by 28 publications

References 39 publications

Soil fungi and fine root biomass mediate drought‐induced reductions in soil respiration

Soil fungi and fine root biomass mediate drought‐induced reductions in soil respiration

Different responses of soil respiration and its components to nitrogen and phosphorus addition in a subtropical secondary forest

Management scheme influence and nitrogen addition effects on soil CO2, CH4, and N2O fluxes in a Moso bamboo plantation

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