Enzymatic stoichiometry in tropical soil under pure and mixed plantations of eucalyptus with N2-fixing trees

Pereira, Arthur Prudêncio de Araújo; Araújo, Ademir Sérgio Ferreira de; Santana, Maiele Cintra; Lima, Antonio Yan Viana; Araújo, Victor Lucas Vieira Prudêncio de; Verma, Jay Prakash; Cardoso, Elke Jurandy Bran Nogueira

doi:10.1590/1678-992x-2021-0283

Cited by 5 publications

(2 citation statements)

References 37 publications

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“…The introduction of legumes into cropping systems (Sekaran et al, 2019), the permanence of plant residues in the soil (Malobane et al, 2020), and the high temperatures found in tropical dry regions are factors that increase urease activity. It is well known that the Nacquiring enzyme is influenced by inputs of plant litter (Mukumbareza et al, 2016) as well as the presence of Nfixing tree species (Pereira et al, 2023). On the other hand, the land uses with Ipê forest (TAB) and tropical forest (TDF) showed the highest values of N-acquiring enzyme at 5−10 cm depth.…”

Section: Discussionmentioning

confidence: 98%

“…One method to estimate the nutrient demands by microbes and C, N, and P availability in soils is the stoichiometry of C-, N-, and P-acquiring enzymes (Sinsabaugh et al, 2009) and it has been applied in several previous studies (Zhang et al, 2021;Araujo et al, 2022;Pereira et al, 2023). In addition, the enzymatic stoichiometry can indicate which conditions C, N, and P are limited to soil microorganisms.…”

Section: Introductionmentioning

confidence: 99%

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Microbial enzymatic stoichiometry and the acquisition of C, N, and P in soils under different land-use types in Brazilian semiarid

Medeiros¹,

Silva²,

Duda³

et al. 2023

Soil Ecol. Lett.

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The enzymatic stoichiometry varied between land-use in both soil depth.• The values of C-and N-acquiring enzymes were higher at 0−5 cm depth.• Soils under different land-use types in the Brazilian semiarid are P-limited. This study hypothesized that different land-use affect the microbial enzymatic stoichiometry and C-, N-, and P-acquisition in Brazilian semiarid soils. Thus, the enzymes β-glucosidase (C-acquiring enzyme), urease (N-acquiring enzyme), and acid phosphatase (P-acquiring enzyme) were assessed in soil samples collected at 0−5 and 5−10 cm depth from a tropical dry forest, a protected area with Angico, a protected area with Ipê, scrub area, and an agricultural area with maize.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Microbial enzymatic stoichiometry and the acquisition of C, N, and P in soils under different land-use types in Brazilian semiarid

Medeiros¹,

Silva²,

Duda³

et al. 2023

Soil Ecol. Lett.

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Introducing N2-Fixing Tree Species into Eucalyptus Plantation in Subtropical China Alleviated Carbon and Nitrogen Constraints within Soil Aggregates

Yan

Huang

et al. 2022

Forests

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Soil extracellular enzymatic activity (EEA) and extracellular enzymatic stoichiometry (EES) within aggregates indicate variations in soil-nutrient effectiveness and the nutrient requirements of microorganisms. However, the responses of soil EEA and EES after introducing N2-fixing tree species into Eucalyptus plantations are poorly understood. Therefore, we examined soils from a 15-year-old pure Eucalyptus urophylla plantation (PP) and mixed E. urophylla and Acacia mangium plantation (MP) based on the theory of EEA and EES at the aggregate scale. Aggregates were separated into four fractions using a dry-sieving procedure: >2, 1–2, 0.25–1, and <0.25 mm. We measured the EEA of soil carbon (C)-, nitrogen (N)-, and phosphorus (P)-acquiring enzymes, and examined potential factors (soil physicochemical properties, microbial biomass, and litterfall [LF]) that may influence EEA and EES. Significantly higher (p < 0.05) EEA levels in all aggregates were found in MP than in PP. The average natural logarithmic ratio of C-, N-, and P-acquiring enzyme activities in our study was 1.44:1.21:1, which deviated from the global mean ratio of 1:1:1 and implied that soil microbes were limited by C and N. Moreover, the enzyme C:N ratio (EC:N), C:P ratio (EC:P), and vector length (VL) were markedly lower (p < 0.05) in bulk soil and most aggregates in MP compared to PP, suggesting that C limitation was more serious in PP than in MP. Furthermore, while the vector angle (VA) of bulk soil and four aggregate sizes were all <45° in both the PP and the MP, they were markedly higher (p < 0.05) in bulk soil and >2 mm aggregate in MP than in PP. This indicated that mixing N2-fixing species with Eucalyptus alleviated but did not eliminate N limitation. Our study also found that nitrate nitrogen (NO3−-N), total nitrogen (TN), and microbial biomass C:P ratio (MBC:MBP) were the main factors driving changes in EEA, while LF was a key factor controlling EES (p < 0.05). Overall, introducing N2-fixing species into the Eucalyptus plantation alleviated but did not eliminate C and N limitation. The results provide specific recommendations for soil-nutrient management in Eucalyptus plantations in subtropical China.

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N2-Fixing Tree Species Help to Alleviate C- and P-Limitation in Both Rhizosphere and Non-Rhizosphere Soils in the Eucalyptus Plantations of Subtropical China

Li,

Huang,

You

et al. 2023

Forests

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The extracellular enzyme activity (EEA) and enzymatic stoichiometry (EES) of soil are useful indicators of shifts in soil nutrition and microbial resource requirements. Nevertheless, it is uncertain how the limitation of soil microbial nutrients is altered by a Eucalyptus plantation mixed with a N2-fixing tree species. Our study examined the microbial nutrient limitation in two plantations: a pure Eucalyptus plantation (PP) and a mixed plantation (Eucalyptus and Erythrophleum fordii, MP) in rhizosphere and non-rhizosphere soils, beginning with two indicators, soil EEA and EES. In this study, the soil EEA was considerably (p < 0.05) greater in the MP contrasted to the PP, and the enzyme C:N:P ratios of the PP (1.12:1:1.10) and MP (1.07:1:1.08) both diverged from the global average EEA (1:1:1), and the deviation degree of the PP was greater. The results of the vector analysis demonstrated that the vector angle (VA) and vector length (VL) were considerably (p < 0.05) smaller in the MP contrasted to the PP. In comparison to the PP, the MP had a considerably (p < 0.05) poorer carbon quality index (CQI). Additionally, both microbial and soil properties have a considerable impact on soil EEA and EES, according to variance partitioning analysis (VPA) and redundancy analysis (RDA). In summary, our results show that the restriction of microorganisms on C and P in rhizosphere soils is usually weaker than that in non-rhizosphere soils and that the addition of N2-fixing tree species to Eucalyptus plantations can lessen but not completely remove the restriction of soil microorganisms on C and P. Future management practices involving mixed plantations with N2-fixing trees species could help decrease microbial nutrient limitation and promote sustainable plantations.

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Enzymatic stoichiometry in tropical soil under pure and mixed plantations of eucalyptus with N2-fixing trees

Cited by 5 publications

References 37 publications

Microbial enzymatic stoichiometry and the acquisition of C, N, and P in soils under different land-use types in Brazilian semiarid

Microbial enzymatic stoichiometry and the acquisition of C, N, and P in soils under different land-use types in Brazilian semiarid

Introducing N2-Fixing Tree Species into Eucalyptus Plantation in Subtropical China Alleviated Carbon and Nitrogen Constraints within Soil Aggregates

N2-Fixing Tree Species Help to Alleviate C- and P-Limitation in Both Rhizosphere and Non-Rhizosphere Soils in the Eucalyptus Plantations of Subtropical China

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