Drought differentially affects autotrophic and heterotrophic soil respiration rates and their temperature sensitivity

Sun, Shouqin; Lei, Haiqing; Chang, Scott X.

doi:10.1007/s00374-019-01347-w

Cited by 41 publications

(35 citation statements)

References 73 publications

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“…Our results are unique in that R SA increased under drought, whereas in most other studies R SA declined instead (Hinko‐Najera et al., 2015; Huang et al., 2018; Li et al., 2018; Risk et al., 2012; Sun et al., 2019). We attribute this to the more moderate treatment design (−30% throughfall exclusion in the current study vs. −40%, −50%, or even −100% seasonal exclusion in others), and unusually high precipitation in the second and third year of the current study (Bracho et al., 2018; Will et al., 2015), which likely ameliorated any physiological drought responses.…”

Section: Resultscontrasting

confidence: 53%

Heterotrophic Respiration and the Divergence of Productivity and Carbon Sequestration

Noormets

Bracho

Ward

et al. 2021

Geophysical Research Letters

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Net primary productivity (NPP) and net ecosystem production (NEP) are often used interchangeably, as their difference, heterotrophic respiration (soil heterotrophic CO2 efflux, RSH = NPP−NEP), is assumed a near‐fixed fraction of NPP. Here, we show, using a range‐wide replicated experimental study in loblolly pine (Pinus taeda) plantations that RSH responds differently than NPP to fertilization and drought treatments, leading to the divergent responses of NPP and NEP. Across the natural range of the species, the moderate responses of NPP (+11%) and RSH (−7%) to fertilization combined such that NEP increased nearly threefold in ambient control and 43% under drought treatment. A 13% decline in RSH under drought led to a 26% increase in NEP while NPP was unaltered. Such drought benefit for carbon sequestration was nearly twofold in control, but disappeared under fertilization. Carbon sequestration efficiency, NEP:NPP, varied twofold among sites, and increased up to threefold under both drought and fertilization.

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Section: Resultscontrasting

confidence: 53%

Heterotrophic Respiration and the Divergence of Productivity and Carbon Sequestration

Noormets

Bracho

Ward

et al. 2021

Geophysical Research Letters

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“…Predicting the response of SR to drought is inherently di cult as SR is a combination of respiration associated with root activity (autotrophic respiration, AR) and soil organic matter (SOM) decomposition (heterotrophic respiration, HR) (Wang et al, 2014). Due to the difference in turnover times and control factors of plant and soil C pools, AR and HR often responded differently to drought (Borken et al, 2006;Huang et al, 2018;Sun et al, 2019). It has been shown that drought reduced AR, and thus SR, but had no effect on HR in a dry temperate forest (Hinko-Najera et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Different mechanisms underlying divergent responses of autotrophic and heterotrophic respiration to long-term throughfall reduction in a warm-temperate oak forest

Zhang

Liu

et al. 2021

Preprint

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Background: There are many studies on disentangling the responses of autotrophic (AR) and heterotrophic (HR) respiration components of soil respiration (SR) to long-term drought, but few studies have focused on the mechanisms underlying its responses.Methods: To explore the impact of prolonged drought on AR and HR, We conducted the 2-year measurements on soil CO2 effluxes in the 7th and 8th year of manipulated throughfall reduction (TFR) in a warm-temperate oak forest. Results: Our results showed long-term TFR decreased HR, which was positively related to bacterial richness. More importantly, some bacterial taxa such as Novosphingobium and norank Acidimicrobiia, and fungal Leptobacillium were identified as major drivers of HR. In contrast, long-term TFR increased AR due to the increased fine root biomass and production. The increased AR accompanied by decreased HR appeared to counteract each other, and subsequently resulted in the unchanged SR under the TFR. Conclusions: Our study shows that HR and AR respond in the opposite directions to long-term TFR. Soil microorganisms and fine roots account for the respective mechanisms underlying the divergent responses of HR and AR to long-term TFR. This highlights the contrasting responses of AR and HR to prolonged drought should be taken into account when predicting soil CO2 effluxes under future droughts.

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“…R s and R h were monitored on clear days once every month between August 2016 and July 2017 using a LI-COR 8100 infrared gas analyzer. All measurements of R s and R h were carried out from 8:00 to 11:00 a.m. R a was calculated by subtracting R h from R s (Sun et al, 2019). The soil temperature and humidity sensors equipped with the LI-COR 8100 system were used to record T s and M s at a soil depth of 10 cm (Shen et al, 2014).…”

Section: Measurement Of Soil Respiration and Its Componentsmentioning

confidence: 99%

“…In future climate scenarios, the intensity and frequency of precipitation is forecasted to decrease in many areas (IPCC, 2013;Sun et al, 2019). Reductions in precipitation induced by climate change will greatly impact terrestrial carbon (C) cycling, including soil respiration (R s ), especially in arid and semiarid regions (Ahlström et al, 2015;van der Molen et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Response of Soil Respiration and Its Components to Precipitation Exclusion in Vitex negundo Var. Heterophylla Shrubland of the Middle Taihang Mountain in North China

Shen

Zhang

Meng

et al. 2021

Front. Environ. Sci.

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Assessing the response of soil heterotrophic and autotrophic respiration to climate change is critical for forecasting terrestrial carbon cycle behavior in the future. In the present study, we conducted a drought experiment in Vitexnegundo var. heterophylla shrub ecosystem of the Middle Taihang Mountain. Three precipitation manipulation treatments (natural conditions/ambient precipitation (CK), reduced precipitation by 30% (PE30), and reduced precipitation by 60% (PE60)) were used to study the impact of different levels of precipitation exclusion on total soil respiration (Rs) and its heterotrophic (Rh) and autotrophic (Ra) components. Our results showed that the rates of Rs and its components were significantly decreased under the precipitation exclusion treatments. The proportion of Rh in Rs reduced from 72.6% for CK to 71.9% under PE60. The annual cumulative C fluxes of Rs decreased by 47.8 g C m−2 in PE30 and 106.0 g C m−2 in PE60, respectively. An exponential relationship was observed between the rate of each soil respiration component and soil temperature in all treatments ( p < 0.01). Moreover, each soil respiration component rate was better represented by a quadratic model which included soil moisture ( p < 0.01). However, including both of soil temperature and soil moisture did not explain more variation in soil respiration components compared than the regression model with soil moisture only. In addition, excluding precipitation increased the temperature sensitivity (Q10 values) of Rs and its Ra and Rh components compared to the control. Collectively, our findings suggest that increased drought will inhibit the release of carbon from the soil to the atmosphere, and will likely decrease the contribution of Rh to Rs in this semiarid shrubland ecosystem.

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Drought differentially affects autotrophic and heterotrophic soil respiration rates and their temperature sensitivity

Cited by 41 publications

References 73 publications

Heterotrophic Respiration and the Divergence of Productivity and Carbon Sequestration

Heterotrophic Respiration and the Divergence of Productivity and Carbon Sequestration

Different mechanisms underlying divergent responses of autotrophic and heterotrophic respiration to long-term throughfall reduction in a warm-temperate oak forest

Response of Soil Respiration and Its Components to Precipitation Exclusion in Vitex negundo Var. Heterophylla Shrubland of the Middle Taihang Mountain in North China

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