Stoichiometric models of microbial metabolic limitation in soil systems

Cui, Yongxing; Moorhead, Daryl L.; Guo, Xiaoyu; Peng, Shushi; Wang, Yunqiang; Zhang, Xingchang; Fang, Linchuan

doi:10.1111/geb.13378

Cited by 107 publications

(71 citation statements)

References 85 publications

(179 reference statements)

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“…These results indicated that microbial P limitation occurred after converting cropland to forest. Similarly, under the same OC level (< 10 g kg -1 ), the VT N/P limitation value was close to or less than zero in agriculture and grassland ecosystems but greater than zero in forest ecosystems at global scale (Cui et al 2021). Xu et al…”

Section: Effects Of Cropland Revegetation On Microbial Metabolic Limi...mentioning

confidence: 83%

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Divergent responses of microbial metabolic limitations to cropland revegetation at erosion and deposition topographies in the hilly-gully region of the northern Loess Plateau, China

Yao¹,

Tang²,

Wang³

et al. 2022

Preprint

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Aims Cropland revegetation is an effective measure to curb soil erosion on eroding hillslopes and increase farmers’ income at depositional check dams. However, how soil microbial metabolic limitation responds to cropland revegetation in erosion and deposition landscapes remains poorly understood, which has substantial implications for carbon (C) retention and nutrient cycling in the eroding environment. Methods We sampled 0-2 m soils in cropland and revegetated forest and grassland at upslopes and check dams on the hilly-gully region of the Loess Plateau, China. The activities of soil C-, nitrogen (N)-, and phosphorus (P)-acquiring enzymes were analyzed, and the improved V-T model derived from the vector model with the balance point was used to quantify microbial metabolic limitations based on ecoenzymatic stoichiometry. Results Microorganisms suffered from no energy (C) limitation, but the relative microbial C limitation was greater in revegetated land than in cropland in both landscapes. At upslopes, microbial P limitation occurred in the revegetated forest in soils below 20 cm due to the assimilation of P by the root system, while microorganisms were mainly limited by N in cropland and revegetated grassland. At check dams, land-use change had no significant influence on microbial N/P limitations owing to abundant soil C and nutrients and a wet environment. Conclusions Concludingly, this study revealed a non-response phenomenon of cropland revegetation on microbial metabolic limitation at lower-lying depositional topography, which compensates for the current understanding of resource restrictions on microorganisms at slopes or flat areas.

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Section: Effects Of Cropland Revegetation On Microbial Metabolic Limi...mentioning

confidence: 83%

“…EEAC: CBH+BG; EEAN: NAG+LAP; EEAP: AP. Cropland a , Forest a ; and Grassland a were from Cui et al (2021) at global scale. Detailed information was in Table S2.…”

Section: Discussionmentioning

confidence: 99%

Divergent responses of microbial metabolic limitations to cropland revegetation at erosion and deposition topographies in the hilly-gully region of the northern Loess Plateau, China

Yao¹,

Tang²,

Wang³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…We observed the ratio of the natural logarithm of C-, N-, and P-acquiring enzymes is approximately 1.3:1.3:1 in this study, which diverged from the ratio of 1:1:1 on a global scale ( Sinsabaugh et al, 2009 ). Cui et al (2021) revealed the relationships of C:N:P-acquiring enzyme activities far from the widely recognized mean ratio of 1:1:1 in different ecosystems. Low-concentration P fertilizers addition resulted in the drift of the ratio to 1.2:1.3:1, indicating that microorganisms are still co-limited by C and N ( Yang et al, 2020 ).…”

Section: Discussionmentioning

confidence: 93%

Effects of Nitrogen and Phosphorus Addition on Soil Extracellular Enzyme Activity and Stoichiometry in Chinese Fir (Cunninghamia lanceolata) Forests

Gan

et al. 2022

Front. Plant Sci.

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Soil extracellular enzymes play an important role in microbial functions and soil nutrient cycling in the context of increasing N deposition globally. This is particularly important for Chinese fir (Cunninghamia lanceolata) forests because of the decline in soil fertility induced by successive rotation. In this study, we aimed to determine the effects of simulated N deposition (N30: 30 kg ha−2 year−1; N60: 60 kg ha−2 year−1) and phosphorus addition (P20: 20 mg kg−1; P40: 40 mg kg−1) on the activity and stoichiometry of soil extracellular enzymes related to soil C, N, and P cycling in Chinese fir. The results showed that N addition alone increased the activity of soil β-1,4 glucosidase (BG) but decreased the activity of N-acetyl-β-d-glucosidase (NAG) and leucine aminopeptidase (LAP). N addition increased the ratios of soil enzymes, C:N and C:P, alleviated microbial N-limitation, and aggravated microbial C-limitation. P addition alone increased enzyme activity, and P40 addition increased the ratio of BG to soil microbial biomass carbon (MBC), and (NAG + LAP):MBC activity ratio, thereby aggravating C restriction. N and P co-addition significantly affected soil extracellular enzyme activity and stoichiometry. For instance, BG activity and BG:MBC activity ratio increased significantly under the N30 + P40 treatment, which intensified C-limitation. Soil pH was the main factor influencing enzyme activity, and these variables were positively correlated. The stoichiometric relationships of enzyme reactions were coupled with soil pH, total nitrogen (TN), and available phosphorus (AP). Our results indicate that changes in soil characteristics induced by N and P inputs influence the activities of soil microorganisms and result in changes in microbial resource acquisition strategies. This study provides useful insights into the development of management strategies to improve the productivity of Chinese fir forests under scenarios of increasing N deposition.

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“…Microbial communities may be subject to diverse restrictions on soil nutrients under different environmental conditions ( Cui et al, 2021a ). TER L can be used to identify which element has the strongest limitation for microbial community growth ( Cui et al, 2021b ). In this study, microbial metabolism was N-limited at the early stage of vegetation restoration (< 31 years) and the microbial N limitation decreased significantly, thereafter shifted to microbial P limitation ( Figure 3C ).…”

Section: Discussionmentioning

confidence: 99%

“…TER L model defines the microbial N or P limitation by scaling the TER. We calculated a new TER model (TER L ) to identify which nutrient has the strongest limitation with the following equations ( Cui et al, 2021b ):…”

Section: Methodsmentioning

confidence: 99%

Consistent Plant and Microbe Nutrient Limitation Patterns During Natural Vegetation Restoration

et al. 2022

Self Cite

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Vegetation restoration is assumed to enhance carbon (C) sequestration in terrestrial ecosystems, where plant producers and microbial decomposers play key roles in soil C cycling. However, it is not clear how the nutrient limitation patterns of plants and soil microbes might change during vegetation restoration. We investigated the nutrient limitations of the plant and microbial communities along a natural vegetation restoration chronosequence (1, 8, 16, 31, and 50 years) following farmland abandonment in Qinling Mountains, China, and assessed their relationships with soil factors. The result showed that following natural vegetation restoration, the nitrogen (N) limitation of plant and microbial communities was alleviated significantly, and thereafter, it began to shift to phosphorus (P) limitation at a later stage. Plants showed P limitation 50 years after restoration, while microbial P limitation appeared 31 years later. The changes in plant nutrient limitation were consistent with those in microbial nutrient limitation, but soil microbes were limited by P earlier than plants. Random forest model and partial least squares path modeling revealed that soil nutrient stoichiometry, especially soil C:N ratio, explained more variations in plant and microbial nutrient limitation. Our study demonstrates that the imbalanced soil C:N ratio may determine the soil microbial metabolic limitation and further mediate the variation in plant nutrient limitation during natural vegetation restoration, which provides important insights into the link between metabolic limitation for microbes and nutrient limitation for plants during vegetation restoration to improve our understanding of soil C turnover in temperate forest ecosystems.

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Stoichiometric models of microbial metabolic limitation in soil systems

Cited by 107 publications

References 85 publications

Divergent responses of microbial metabolic limitations to cropland revegetation at erosion and deposition topographies in the hilly-gully region of the northern Loess Plateau, China

Divergent responses of microbial metabolic limitations to cropland revegetation at erosion and deposition topographies in the hilly-gully region of the northern Loess Plateau, China

Effects of Nitrogen and Phosphorus Addition on Soil Extracellular Enzyme Activity and Stoichiometry in Chinese Fir (Cunninghamia lanceolata) Forests

Consistent Plant and Microbe Nutrient Limitation Patterns During Natural Vegetation Restoration

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