What is the pathway that determines the diurnal lag time between soil respiration and soil temperature?

Chu, Houkun; Ni, Hong Wei; Ma, Jingyong; Shen, Yuying

doi:10.1016/j.geoderma.2023.116344

Cited by 5 publications

(4 citation statements)

References 48 publications

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“…The N fertilization significantly increased cumulative CO 2 emissions (37–176 kg C ha −1 ; Figure 3a,d), and the results are consistent with the results of cumulative CO 2 emissions from maize fields at seedling growth in the range of 21–196 kg C ha −1 under different fertilization input amounts (0–320 kg N ha −1 ; Zhang et al, 2023). The CO 2 fluxes are positively related to soil moisture ( p < 0.05) and temperature ( p < 0.05; Figure 7), which is probably due to the activity of heterotrophic microorganisms in the soil (Chu et al, 2023).…”

Section: Discussionmentioning

confidence: 97%

Optimized fertilization mitigated carbon and nitrogen losses in a Solonchak

Zhang,

Liu,

Feng

et al. 2024

European J Soil Science

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With the rapid expansion of agriculture on saline–alkaline soils, environmental problems such as increased greenhouse gas (GHG) emissions, eutrophication and soil degradation are becoming increasingly serious. To clarify the characteristics of carbon (C) and nitrogen (N) cycling and their loss mechanisms in cultivated saline–alkaline soils, an undisturbed soil column experiment was conducted to analyse C and N leaching and GHG emissions by applying different fertilizer rates. The experiment had six treatments using N‐(NH4)SO4 over a 40‐day seedling stage, with and without maize. Treatments were: no N with maize (0Nmaize: 0 kg N ha−1), reduced N with maize (RNmaize: 63 kg N ha−1), conventional N with maize (CNmaize: 160 kg N ha−1) and their equivalents without maize (0Nsoil: 0 kg N ha−1; RNsoil: 63 kg N ha−1; CNsoil: 160 kg N ha−1). The results indicated that reduced N with maize reduced the N2O emission by 21%, with N leaching (TN: 41%, NO3−–N: 19%, NH4+ − N: 63%) within 15 days after fertilization, but had no significant effect on CH4 emission compared to conventional N with maize. Therefore, reduced N with maize had the smallest N loss, which accounted for 1.5% of the relative percentage of N flow including N2O (0.3%), N leaching (2%), aboveground biomass N (76%) and root biomass N (22%). Compared to conventional N with maize, reduced N with maize significantly reduced N leaching by 40% because conventional N with maize greatly exceeded the crop N uptake when maize root length was only within 20 cm. Reduced N without maize reduced CO2 emission (19%) compared to conventional N without maize. Uncultivated saline–alkaline soils face greater N overuse and leaching risk because higher NO3−–N leaching (6.9 mg L−1) that occurred in bare soils without fertilization, which increased by 2.6–3.6 times when the N input increased from 63 to 160 kg N ha−1 compared to control. In conclusion, reducing conventional N fertilizer inputs by 60% is not only an effective strategy to reduce CO2 and N2O emission and N leaching but also effectively absorbs C, and the N retained in the soil tillage layer can help to meet maize seedling growth requirements in Solonchaks.

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Section: Discussionmentioning

confidence: 97%

Optimized fertilization mitigated carbon and nitrogen losses in a Solonchak

Zhang,

Liu,

Feng

et al. 2024

European J Soil Science

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“…Chu et al. ( 2023 ) observed that the lag time between R s and soil temperature ranged from 1 to 8 h.…”

Section: Discussionmentioning

confidence: 99%

“…This delay in reaction to the warmer air temperature may be related to the hysteresis effect or lag time in the change of temperature in the deeper soil depth, considering that the negative temperature was recorded during snow thawing due to warm air temperature. Chu et al (2023) observed that the lag time between R s and soil temperature ranged from 1 to 8 h.…”

Section: Temperature Changes With Soil Depthsmentioning

confidence: 98%

Soil respiration and controls in warmer winter: A snow manipulation study in postfire and undisturbed black pine forests

Pacaldo,

Aydin,

Amarille

2024

Ecology and Evolution

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Climate change impacts drive warmer winters, reduced snowfall, and forest fires. In 2020, a wildfire scorched about 1508 hectares of black pine (Pinus nigra Arnold) forests in Türkiye. Whether the combined effects of lack of snow and forest fires significantly alter winter soil respiration (Rs) and soil temperature remains poorly understood. A field experiment was conducted in the postfire and undisturbed black pine forests during the winter to quantify Rs rates as affected by lack of snow and forest fire. We applied four treatments: snow‐exclusion postfire (SEPF), snow postfire (SPF), snow‐exclusion‐undisturbed forest (SEUF), and snow undisturbed forest (SUF). The SEPF exhibited the significantly lowest mean Rs rates (0.71 μmol m−2 s−1) compared to the SPF (1.02 μmol m−2 s−1), SEUF (1.44 μmol m−2 s−1), and SUF (1.48 μmol m−2 s−1). The Rs also showed significant variations with time (p < .0001). However, treatments and time revealed no statistically significant interaction effects (p = .6801). Total winter Rs (January–March) ranged from 4.47 to 4.59 Mt CO2 ha−1 in the undisturbed forest and 2.20 to 3.16 Mt CO2 ha−2 in the postfire site. The Rs showed a significantly positive relationship (p < .0001) with the soil (0.59) and air (0.46) temperatures and a significantly negative relationship (p = .0017) with the soil moisture (−0.20) at the 5 cm depth. In contrast, the Rs indicated a negative but not statistically significant relationship (p = .0932) with the soil moisture (−0.16) at the 10 cm soil depth. The combined effects of lack of snow and forest fire significantly decreased Rs, thus conserving the soil's organic carbon stocks and reducing the CO2 contribution to the atmosphere. In contrast, a warmer winter significantly increased Rs rates in the undisturbed forest, suggesting an acceleration of soil organic carbon losses and providing positive feedback to climate change.

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“…In a previous study time lags of < 1 h were measured between soil respiration and soil temperature at herbaceous vegetations (Vargas et al 2010). In a recent study 1-10-hour lags were recorded but the results indicated that PAR, therefore the photosynthetic activity of the vegetation, regulated the diurnal hysteresis pattern between T s and R s (Chu et al 2023), hence the larger time lags. We observed that R het generally reached its maximum values not long before T s did.…”

Section: Consequences Of the Root Exclusion Techniquementioning

confidence: 95%

Mycorrhizal fungi respiration dynamics in relation to gross primary production in a Hungarian dry grassland

De Luca,

Papp,

Fóti

et al. 2023

Preprint

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Aims: Soil respiration (Rs) is a highly complex process including a wide range of soil biota and different pathways of carbon cycling, all being under the control of various drivers. The most important biotic driver is the photosynthetic activity of the vegetation providing supply mainly for the autotrophic component of Rs: roots and their symbiotic partners. The objective of this study was to describe the time-lagged relationship between gross primary production (GPP) and the mycorrhizal Rs component in order to determine the amount of carbon derived from GPP appearing as mycorrhizal respiration (Rmyc). Methods: Measurements of Rs were conducted in three treatments – i) undisturbed, root and AMF-included (Rs), ii) root-excluded (Rhet+myc) and iii) root- and AMF-excluded (Rhet) plots – for three consecutive years in the Central-Hungarian dry sandy grassland study site. GPP data were derived from eddy-covariance measurements, while an automated system was used for continuous measurements of Rs. We analysed the relationship between Rmyc and GPP by using cross-correlation and by fitting sine wave models on the diel datasets. Results: GPP was found to be the main driver of Rmyc, responding with an average time lag of 18 hours. The greatest lags were detected during periods characterized by minimal photosynthetic activity, while lags tended to be the smallest during active periods. Conclusion: Based on the seasonal changes in the delay, we concluded that GPP and soil temperature had simultaneous effects on the diel pattern of CO2 emission of the different autotrophic components depending on the vegetation activity and environmental conditions.

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What is the pathway that determines the diurnal lag time between soil respiration and soil temperature?

Cited by 5 publications

References 48 publications

Optimized fertilization mitigated carbon and nitrogen losses in a Solonchak

Optimized fertilization mitigated carbon and nitrogen losses in a Solonchak

Soil respiration and controls in warmer winter: A snow manipulation study in postfire and undisturbed black pine forests

Mycorrhizal fungi respiration dynamics in relation to gross primary production in a Hungarian dry grassland

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