Physical, biochemical, and microbial controls on amino sugar accumulation in soils under long-term cover cropping and no-tillage farming

Li, Lidong; Wilson, Candace Brooke; He, Hongbo; Zhang, Xudong; Zhou, Feng; Schaeffer, Sean M.

doi:10.1016/j.soilbio.2019.05.017

Cited by 108 publications

(38 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our results demonstrated that the concentrations of MurN and bacterial MRC were significantly greater in MA than those in LMA and SMA, whereas the contribution of fungal MRC and total MRC to SOC were significantly lower in MA than those in LMA and SMA. These changes were closely associated with the variation of soil abiotic and microbial properties among the aggregate fractions (Li et al., 2019; Schweizer et al., 2019). Higher fungal to bacterial MRC ratio in LMA and SMA than in MA further suggests that fungi contributed more to residual C in macroaggregates and bacteria contributed more to residual C in microaggregates.…”

Section: Discussionmentioning

confidence: 98%

“…A growing body of evidence suggests that microbial residue is an important source of stable soil organic matter (SOM) and contributes up to 50% of SOC (Liang & Balser, 2010; Liang et al., 2017; Miltner et al., 2012; Ni et al., 2020). Amino sugars, as specific biomarkers of microbial residues, have been widely used to indicate the contribution of soil microbial residues to SOC accumulation and turnover in various habitats (Huang et al., 2018, 2019; Li et al., 2019; Ma et al., 2020; Murugan et al., 2019). Four amino sugars, including glucosamine (GluN), galactosamine (GalN), mannosamine (ManN) and muramic acid (MurN), have often been quantified in previous studies (Joergensen, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Contrasting results are found because N and P addition often increases both the distribution of macroaggregates and SOC content (Ghosh et al., 2018; Luo et al., 2020), which lead to larger SOC amounts, but higher lability for decomposition. Soil aggregates can create microhabitats for microorganisms and thus may affect the distribution of microbial residues in soil aggregates, as fungi prefer to macroaggregates and bacteria prefer to microaggregates (Lehmann et al., 2017; Li et al., 2019; Murugan et al., 2019; Wang, Ding, et al., 2017; Wang, Dorodnikov, et al., 2017). However, the information about how soil aggregates affect the response of soil microbial residues to nutrient additions is still limited.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phosphorus addition decreases microbial residual contribution to soil organic carbon pool in a tropical coastal forest

Yuan

Mou

et al. 2020

Global Change Biology

109

View full text Add to dashboard Cite

The soil nitrogen (N) and phosphorus (P) availability often constrains soil carbon (C) pool, and elevated N deposition could further intensify soil P limitation, which may affect soil C cycling in these N‐rich and P‐poor ecosystems. Soil microbial residues may not only affect soil organic carbon (SOC) pool but also impact SOC stability through soil aggregation. However, how soil nutrient availability and aggregate fractions affect microbial residues and the microbial residue contribution to SOC is still not well understood. We took advantage of a 10‐year field fertilization experiment to investigate the effects of nutrient additions, soil aggregate fractions, and their interactions on the concentrations of soil microbial residues and their contribution to SOC accumulation in a tropical coastal forest. We found that continuous P addition greatly decreased the concentrations of microbial residues and their contribution to SOC, whereas N addition had no significant effect. The P‐stimulated decreases in microbial residues and their contribution to SOC were presumably due to enhanced recycling of microbial residues via increased activity of residue‐decomposing enzymes. The interactive effects between soil aggregate fraction and nutrient addition were not significant, suggesting a weak role of physical protection by soil aggregates in mediating microbial responses to altered soil nutrient availability. Our data suggest that the mechanisms driving microbial residue responses to increased N and P availability might be different, and the P‐induced decrease in the contribution of microbial residues might be unfavorable for the stability of SOC in N‐rich and P‐poor tropical forests. Such information is critical for understanding the role of tropical forests in the global carbon cycle.

show abstract

Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Phosphorus addition decreases microbial residual contribution to soil organic carbon pool in a tropical coastal forest

Yuan

Mou

et al. 2020

Global Change Biology

109

View full text Add to dashboard Cite

show abstract

“…Organic amendments, crop residues, crop rotation, cover cropping, and cropping diversity. [72][73][74] Soil protein contents.…”

Section: May Activate Cmentioning

confidence: 99%

Continuous Cropping Alters Multiple Biotic and Abiotic Indicators of Soil Health

et al. 2020

View full text Add to dashboard Cite

The continuous cropping (CC) of major agricultural, horticultural, and industrial crops is an established practice worldwide, though it has significant soil health-related concerns. However, a combined review of the effects of CC on soil health indicators, in particular omics ones, remains missing. The CC may negatively impact multiple biotic and abiotic indicators of soil health, fertility, and crop yield. It could potentially alter the soil biotic indicators, which include but are not limited to the composition, abundance, diversity, and functioning of soil micro- and macro-organisms, microbial networks, enzyme activities, and soil food web interactions. Moreover, it could also alter various soil abiotic (physicochemical) properties. For instance, it could increase the accumulation of toxic metabolites, salts, and acids, reduce soil aggregation and alter the composition of soil aggregate-size classes, decrease mineralization, soil organic matter, active carbon, and nutrient contents. All these alterations could accelerate soil degradation. Meanwhile, there is still a great need to develop quantitative ranges in soil health indicators to mechanistically predict the impact of CC on soil health and crop yield gaps. Following ecological principles, we strongly highlight the significance of inter-, mixture-, and rotation-cropping with cover crops to sustain soil health and agricultural production.

show abstract

“…The greater clay content of these soils may have protected the purported amino sugar from basic hydrolysis. Several studies concluded that soil amino sugars are stabilized in soil aggregates (Li et al., ), perhaps preferentially in microaggregates within macroaggregates (Simpson et al., ). The extent to which soil texture and aggregation may have played a role in AST‐N levels in the present study is unknown.…”

Section: Resultsmentioning

confidence: 99%

Can an amino sugar test estimate potentially available nitrogen from biosolids?

White

Dodd²,

Walters

2020

Soil Science Soc of Amer J

View full text Add to dashboard Cite

Biosolids land application is governed by N content and estimates of potentially available N (PAN). Amino sugar test N (AST‐N) has been used with varying success to estimate soil responsiveness to N and optimum N rates. We investigated the utility of an amino sugar test (AST) in estimating PAN and hypothesized that this would depend on biosolids type, rate, and receiving soil. In vitro, we applied three dissimilar biosolids at five rates to four representative southeastern US soils, measured AST‐N, and estimated recovery of biosolids AST‐N. Target PAN rates were zero to two times a realistic yield expectation rate (127 kg N ha−1) for a common biosolids‐receiving grass. Rates were based on biosolids type, total N, and book‐value availability coefficients. Biosolids AST‐N varied from 263 to 9790 mg kg−1 (3.8–20.1% of total N). Soil AST‐N was 66–93 mg kg−1 and differed among soils. Treatment interactions indicated that AST‐N of the biosolids–soil mixtures differed from what might be predicted from biosolids and soil AST‐N and rate. Rate response was linear; thus, the AST did not saturate at the rates tested. Biosolids AST‐N recovery ranged from −303 to 152% depending on biosolids, rate, soil, and their interactions. The AST‐N was related linearly to total N from anaerobic incubation (R2 = 0.10–0.67), depending on biosolids. The weakness of these relationships; the biosolids, rate, and soil interactions; and the potential confounding effects of biosolids and soil NH4–N suggest that AST‐N would not be a good estimator of PAN.

show abstract

Physical, biochemical, and microbial controls on amino sugar accumulation in soils under long-term cover cropping and no-tillage farming

Cited by 108 publications

References 65 publications

Phosphorus addition decreases microbial residual contribution to soil organic carbon pool in a tropical coastal forest

Phosphorus addition decreases microbial residual contribution to soil organic carbon pool in a tropical coastal forest

Continuous Cropping Alters Multiple Biotic and Abiotic Indicators of Soil Health

Can an amino sugar test estimate potentially available nitrogen from biosolids?

Contact Info

Product

Resources

About