The phosphorus limitation in the post-fire forest soils increases soil CO2 emission via declining cellular carbon use efficiency and increasing extracellular phosphatase

Auwal, Muhammad; Sun, Han; Adamu, U.K; Meng, Jun; Zwieten, Lukas Van; Singh, Bhupinder; Luo, Yu; Xu, Jianming

doi:10.1016/j.catena.2023.106968

Cited by 10 publications

(2 citation statements)

References 102 publications

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“…After fire disturbance, the contents of both inorganic and organic P undergo noticeable changes. Research shows that wildfires will increase soil inorganic P content by 24%–40%, while organic P content will decrease by 47% or more, and this change will still exist even 5 years after the fire (Auwal et al, 2023; Kong et al, 2018; Otero et al, 2015; Romanyà et al, 1994). This signifies an expansion of the soil available P pool, in conjunction with a contraction of the potential available P pool.…”

Section: Introductionmentioning

confidence: 99%

Effect of severe wildfire on soil phosphorus fractions and adsorption in a cold temperate coniferous forest after 5 years

Deng,

Zhang,

Zheng

et al. 2024

European J Soil Science

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Forest fires are a primary driver of biogeochemical processes in ecosystems and affect the soil nutrient balance by altering the distribution of organic matter and associated nutrients as well as the composition and availability of elemental nutrients. We investigated the changes in soils’ phosphorus (P) fractions and the adsorption characteristics of potassium dihydrogen orthophosphate (orthoP) and myo‐inositol hexakisphosphate (IHP) at two depths (0–5 and 5–10 cm) in soils from two sites differing in fire severity: long‐unburned and heavily burned. Five years after the fire, there were increases in the total P and extractable inorganic P (H2O‐P, NaHCO3‐Pi, NaOH‐Pi, D.HCl‐Pi and C.HCl‐Pi) contents. Conversely, there was a decrease in organic P (NaHCO3‐Po, NaOH‐Po and C.HCl‐Po). The adsorption of soil for orthoP at a depth of 0–5 cm was dependent on the amount of P supplied by the soil; at low concentrations, heavily burned soil showed a lower adsorption than long‐unburned soil. However, at high concentrations, the adsorption of heavily burned soil was significantly larger than that of long‐unburned soil. With respect to IHP, the adsorption of long‐unburned soil was also more significant at depths of 0–5 cm. The adsorption of both orthoP and IHP of heavily burned soil was significantly higher than that of long‐unburned soil at a depth of 5–10 cm. Fire also decreased the binding degree (k1) of soil‐P and the solid phase at depths of 0–5 and 5–10 cm. The increase in P adsorption capacity outweighed the addition of P from ash, resulting in less leaching in heavily burned areas and minimizing P loss. Overall, forest fires significantly affect the adsorption characteristics and P fractions of soil, specifically orthoP and IHP, during the initial stage of postfire recovery. These effects are closely related to the direct influences of iron oxide, soil organic matter and aluminium oxide in the soil and may even produce relatively long‐term effects on the P recycling process of the entire ecosystem.

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Section: Introductionmentioning

confidence: 99%

Effect of severe wildfire on soil phosphorus fractions and adsorption in a cold temperate coniferous forest after 5 years

Deng,

Zhang,

Zheng

et al. 2024

European J Soil Science

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“…Alternatively, Sinsabaugh et al (2016) proposed a novel model based on the ecoenzymatic stoichiometric theory (EEST) and on the mass balance principle to evaluate NUE from the elemental stoichiometry of organic matter and microbial biomass, given the ratio of activities of enzymes that target carbon (C) vs. N acquisition. A growing body of studies have used the ecoenzyme model to evaluate microbial resource use efficiency in many ecosystems, including forest, farmland and grassland (Auwal et al 2023;Chen et al 2018b;Li et al 2023;Lv et al 2022;Shen et al 2023;Sun et al 2022;Wang et al 2022), partly because parameter determination is rapid, relatively inexpensive and easy to evaluate (Schimel et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Exogenous nitrogen input skews estimates of microbial nitrogen use efficiency by ecoenzymatic stoichiometry

Sun,

Moorhead,

Cui

et al. 2023

Ecol Process

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Background Ecoenzymatic stoichiometry models (EEST) are often used to evaluate microbial nutrient use efficiency, but the validity of these models under exogenous nitrogen (N) input has never been clarified. Here, we investigated the effects of long-term N addition (as urea) on microbial N use efficiency (NUE), compared EEST and 18O-labeling methods for determining NUE, and evaluated EEST’s theoretical assumption that the ratios of standard ecoenzymatic activities balance resource availability with microbial demand. Results We found that NUE estimated by EEST ranged from 0.94 to 0.98. In contrast, estimates of NUE by the 18O-labeling method ranged from 0.07 to 0.30. The large differences in NUE values estimated by the two methods may be because the sum of β-N-acetylglucosaminidase and leucine aminopeptidase activities in the EEST model was not limited to microbial N acquisition under exogenous N inputs, resulting in an overestimation of microbial NUE by EEST. In addition, the acquisition of carbon by N-acquiring enzymes also likely interferes with the evaluation of NUE by EEST. Conclusions Our results demonstrate that caution must be exercised when using EEST to evaluate NUE under exogenous N inputs that may skew standard enzyme assays.

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Pyrogenic organic matter decreases while fresh organic matter increases soil heterotrophic respiration through modifying microbial activity in a subtropical forest

Zhou,

Zhang,

Hui

et al. 2024

Biol Fertil Soils

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The phosphorus limitation in the post-fire forest soils increases soil CO2 emission via declining cellular carbon use efficiency and increasing extracellular phosphatase

Cited by 10 publications

References 102 publications

Effect of severe wildfire on soil phosphorus fractions and adsorption in a cold temperate coniferous forest after 5 years

Effect of severe wildfire on soil phosphorus fractions and adsorption in a cold temperate coniferous forest after 5 years

Exogenous nitrogen input skews estimates of microbial nitrogen use efficiency by ecoenzymatic stoichiometry

Pyrogenic organic matter decreases while fresh organic matter increases soil heterotrophic respiration through modifying microbial activity in a subtropical forest

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