Effects of elevated CO 2 and drought on the microbial biomass and enzymatic activities in the rhizospheres of two grass species in Chinese loess soil

Xue, Sha; Yang, Xiaomei; Liu, Guobin; Gai, Lingtong; Ritsema, C.J.; Geissen, Violette

doi:10.1016/j.geoderma.2016.10.025

Cited by 42 publications

(23 citation statements)

References 59 publications

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“…Therefore, with time, other factors, such as a reduction of the amount and quality of soil organic matter (Vargas et al, ) or an alteration to the soil microbial community structure (Canarini, Kiær, & Dijkstra, ; Goberna, García, Insam, Hernández, & Verdú, ) may cause decreased soil microbial activity. The observed reduction in enzyme activities is consistent with the positive correlation between these changes and soil moisture reported in many studies (Alster, German, Lu, & Allison, ; Baldrian, Merhautová, Petránková, Cajthaml, & Šnajdr, ; Xue et al, ). However, not all studies found such an explicit link between drought and enzyme activity (Bell et al, ; Steinweg, Dukes, & Wallenstein, ).…”

Section: Discussionsupporting

confidence: 90%

“…In the burned soils of this experiment, microbial biomass was significantly reduced because of drought, while its effects persisted over the 4 years under drought treatments. Drought directly affects soil microorganisms by creating osmotic stress, which can bring them to a dormant state (Blagodatskaya & Kuzyakov, 2013) or death (Xue et al, 2017). In addition, indirect changes in belowground inputs, due to the response of the plant community to drought stress, could influence its functional structure (Classen et al, 2015;Milcu, Paul, & Lukac, 2011;Sanaullah, Blagodatskaya, Chabbi, Rumpel, & Kuzyakov, 2011).…”

Section: Effect Of Droughtmentioning

confidence: 99%

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Drought and its legacy modulate the post‐fire recovery of soil functionality and microbial community structure in a Mediterranean shrubland

Hinojosa

Laudicina

Parra

et al. 2019

Global Change Biology

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The effects of drought on soil dynamics after fire are poorly known, particularly its long‐term (i.e., years) legacy effects once rainfall returns to normal. Understanding this is particularly important for nutrient‐poor soils in semi‐arid regions affected by fire, in which rainfall is projected to decrease with climate change. Here, we studied the effects of post‐fire drought and its legacy on soil microbial community structure and functionality in a Cistus‐Erica shrubland (Spain). Rainfall total and patterns were experimentally modified to produce an unburned control (natural rainfall) and four burned treatments: control (natural rainfall), historical control (long‐term average rainfall), moderate drought (percentile 8 historical rainfall, 5 months of drought per year), and severe drought (percentile 2, 7 months of drought). Soil nutrients and microbial community composition (ester‐linked fatty acid approach) and functionality (enzyme activities and C mineralization rate) were monitored during the first 4 years after fire under rainfall treatments, plus two additional ones without them (six post‐fire years). We found that the recovery of burned soils was lower under drought. Post‐fire drought increased nitrate in the short term and reduced available phosphorus, exchangeable potassium, soil organic matter, enzyme activities, and carbon mineralization rate. Moreover, drought decreased soil total microbial biomass and fungi, with bacteria becoming relatively more abundant. Two years after discontinuing the drought treatments, the drought legacy was significant for available phosphorus and enzyme activities. Although microbial biomass did not show any drought legacy effect, the proportion of fungi and bacteria (mainly gram‐positive) did, being lower and higher, respectively, in former drought‐treated plots. We show that drought has an important impact on soil processes, and that some of its effects persist for at least 2 years after the drought ended. Therefore, drought and its legacy effects can be important for modeling biogeochemical processes in burned soils under future climate change.

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Section: Discussionsupporting

confidence: 90%

Section: Effect Of Droughtmentioning

confidence: 99%

Drought and its legacy modulate the post‐fire recovery of soil functionality and microbial community structure in a Mediterranean shrubland

Hinojosa

Laudicina

Parra

et al. 2019

Global Change Biology

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“…A relação entre parte aérea é um atributo importante para plantas superar condições de estresse, como a falta de água. Plantas que com menor relação entre parte aérea e raiz geralmente são mais tolerantes ao estresse por falta de água (XUE et al, 2017;ZHANG et al, 2017 -----------------------------------g vaso -1 ------------------------- Apesar de seu uso difundido nos últimos anos, o efeito de produtos bioestimulantes precisa ser melhor compreendido. Na literatura há resultados divergentes sobre a resposta dos bioestimulantes.…”

Section: Resultsunclassified

Bioestimulantes via tratamento de sementes na promoção de crescimento de raizes de feijão (Phaseolus vulgaris)

Oliveira¹,

Umburanas²,

Pereira³

et al. 2017

Revista Brasileira De Tecnologia Aplicada Nas Ciências Agrárias

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Os bioestimulantes são utilizados em lavouras de feijão (Phaseolus vulgaris) para melhorar o desenvolvimento vegetativo das plantas, em especial o radicular. Entretanto, há pouco embasamento científico sobre o efeito desses produtos no desenvolvimento radicular. O objetivo desta pesquisa foi avaliar o efeito de bioestimulantes fornecidos via tratamento de sementes sobre o desenvolvimento radicular de plantas de feijão. O experimento foi realizado sob condições controladas e os tratamentos foram compostos por quatro bioestimulantes, sendo: ácidos húmico e fúlvico; extrato simples de algas (Ascophyllum nodosum); regulador vegetal com citocinina, giberelina e auxina; extrato alcalino de algas (Ascophyllum nodosum) e o tratamento controle. No estádio V 4 foi avaliado o desenvolvimento radicular do feijão, a massa seca do sistema radicular e parte aérea. No sistema radicular das plantas foi quantificado o comprimento da raiz central, comprimento total de raízes, diâmetro de raízes, área projetada de raízes, volume de raízes e volume especifico de raízes. Com exceção do comprimento da raiz central, os bioestimulantes não afetaram nenhuma característica avaliada no sistema radicular do feijão, massa seca ou a relação entre parte aérea e sistema radicular. Nenhum bioestimulante incrementou a relação entre parte aérea e raiz em relação ao controle. O uso de bioestimulantes via tratamento de sementes não incrementou o desenvolvimento do sistema radicular do feijão.

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“…Previous studies indicated that higher CO 2 concentrations (20 %) could benefit the development of fungal abundance when soil water moisture met the demand for plant growth (Xue et al, 2017 of root exudation and potential allelochemicals at elevated CO 2 concentration (Lin et al, 1999). In addition, plant growth can contribute to the decrease of soil nitrogen by root uptake.…”

Section: Response Of Microbial Relative Abundance and Diversitymentioning

confidence: 99%

Elevated Atmospheric CO2 and Drought Affect Soil Microbial Community and Functional Diversity Associated with Glycine max

Wang

Song

et al. 2017

Rev. Bras. Ciênc. Solo

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Under the background of climate change, the increase of atmospheric CO 2 and drought frequency have been considered as significant influencers on the soil microbial communities and the yield and quality of crop. In this study, impacts of increased ambient CO 2 and drought on soil microbial structure and functional diversity of a Stagnic Anthrosol were investigated in phytotron growth chambers, by testing two representative CO 2 levels, three soil moisture levels, and two soil cover types (with or without Glycine max). The 16S rDNA and 18S rDNA fragments were amplified to analyze the functional diversity of fungi and bacteria. Results showed that rhizosphere microbial biomass and community structure were significantly affected by drought, but effects differed between fungi and bacteria. Drought adaptation of fungi was found to be easier than that of bacteria. The diversity of fungi was less affected by drought than that of bacteria, evidenced by their higher diversity. Severe drought reduced soil microbial functional diversity and restrained the metabolic activity. Elevated CO 2 alone, in the absence of crops (bare soil), did not enhance the metabolic activity of soil microorganisms. Generally, due to the co-functioning of plant and soil microorganisms in water and nutrient use, plants have major impacts on the soil microbial community, leading to atmospheric CO 2 enrichment, but cannot significantly reduce the impacts of drought on soil microorganisms.

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Effects of elevated CO 2 and drought on the microbial biomass and enzymatic activities in the rhizospheres of two grass species in Chinese loess soil

Cited by 42 publications

References 59 publications

Drought and its legacy modulate the post‐fire recovery of soil functionality and microbial community structure in a Mediterranean shrubland

Drought and its legacy modulate the post‐fire recovery of soil functionality and microbial community structure in a Mediterranean shrubland

Bioestimulantes via tratamento de sementes na promoção de crescimento de raizes de feijão (Phaseolus vulgaris)

Elevated Atmospheric CO2 and Drought Affect Soil Microbial Community and Functional Diversity Associated with Glycine max

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