Rhizosphere carbon flow in trees, in comparison with annual plants: the importance of root exudation and its impact on microbial activity and nutrient availability

Grayston, Susan J.; Vaughan, D.; Jones, Davey L.

doi:10.1016/s0929-1393(96)00126-6

Cited by 892 publications

(525 citation statements)

References 196 publications

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“…A number of mechanisms have been proposed by which tree-species diversity could influence the storage of C in soils. These include effects of tree-species on water availability, litter quantity and quality, the amount and composition of root exudates, and the distribution of C in the soil profile (Grayston et al, 1997;Rothe and Binkley, 2001;Gleixner et al, 2005;Hattenschwiler, 2005). The absence of a relationship between diversity and SOC within land-use types may reflect the high variability of soils in this landscape; we observed significant variability among soil samples from a single site, suggesting that future attempts to link tree-species diversity to soil C in this landscape should sample soils more intensively.…”

Section: Storage and Biodiversitymentioning

confidence: 99%

Variation in carbon storage among tree species: Implications for the management of a small-scale carbon sink project

Kirby

Potvin

2007

Forest Ecology and Management

359

179

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Section: Storage and Biodiversitymentioning

confidence: 99%

Variation in carbon storage among tree species: Implications for the management of a small-scale carbon sink project

Kirby

Potvin

2007

Forest Ecology and Management

359

179

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“…Although the plant species richness did not significantly affect the BIOLOG Shannon index , the number of utilized carbon resources and the number of PLFAs significantly increased with increasing plant species richness (Figure 2). Grayston et al (1997) found that, as different plant species add different carbon substrates to soil, the number (i.e. the diversity) of soil carbon substrates may also increase with increasing plant species richness.…”

Section: Discussionmentioning

confidence: 99%

Positive effects of plant diversity on soil microbial biomass and activity are associated with more root biomass production

Wang

Jiang

2017

Journal of Plant Interactions

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This study aims to explore relationships between plant diversity and soil microbial function and the factors that mediate the relationships. Artificial plant communities (1, 2, 4 and 8 species) were established filled with natural and mine tailing soils, respectively. After 12 months, the plant species richness positively affected the soil microbial functional diversity in both soil environments but negatively affected microbial biomass and soil basal respiration in the natural soil. The root biomass positively correlated with the microbial biomass, cultural bacterial activity and soil basal respiration in both soil environments. Moreover, the D i (deviations between observed performances and expected performances from the monoculture performance of each species of mixture) of microbial biomass, cultural bacterial activity and soil basal respiration positively correlated with the D i of root biomass in both soil environments. Consistent with stress-gradient hypothesis, the D mix (over-function index) of aboveground biomass positively correlated plant species richness in the mine tailing soil. Results suggest that the root biomass production is an important mechanism that affects the effects of plant diversity on soil microbial functions. Different responses of soil microbial function to increasing plant diversity may be due to root biomass production mediated by other factors. ARTICLE HISTORY

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“…Alguns trabalhos demonstram a importância dos MSFI encontrados no solo rizosférico no suprimento de P e, consequentemente, na promoção de crescimento das plantas (Freitas et al, 1997;Gyaneshwar et al, 2002), em decorrência da interação com as plantas. Entretanto, vários fatores influenciam a atividade dos microrganismos do solo e a solubilização de fosfato inorgânico, como a fonte de carbono e nitrogênio disponíveis (Nautiyal et al, 2000), a espécie de planta cultivada (Grayston et al, 1996), a fonte de fosfato (Barroso & Nahas, 2005) e a presença de agrotóxicos (inseticidas, fungicidas e herbicidas) (Das, 2003;Reis et al, 2008a).…”

Section: Introductionunclassified

Efeito de herbicidas na atividade microbiana do solo

et al. 2009

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RESUMO -Objetivou-se com este trabalho avaliar os efeitos de herbicidas e doses na atividade microbiana e no potencial de solubilização de fosfato inorgânico de solo cultivado com cana-de-açúcar. Os tratamentos foram constituídos pelos herbicidas ametryn, trifloxysulfuron-sodium e pela mistura (ametryn + trifloxysulfuron-sodium), aplicados nas doses de 0, 1, 2, 4 e 8 vezes a dose-referência de 10, 0,112 e 7,315 + 0,185 mg dm -3 do ingrediente ativo dos respectivos herbicidas. Após aplicação dos tratamentos, as amostras de solo foram incubadas por 15 dias, realizando-se as avaliações da evolução de CO 2 do solo (C-CO 2 ) em intervalos de três dias. Ao final do período de incubação foram realizadas análises de carbono da biomassa microbiana (CBM), quociente metabólico (qCO 2 ), potencial de solubilização e solubilização relativa de fosfato inorgânico do solo. A evolução de C-CO 2 foi influenciada pelas maiores doses dos herbicidas, sendo reduzida com a aplicação do trifloxysulfuron-sodium (10,31%) e elevada com os demais herbicidas, com maiores efeitos logo após a aplicação. O CBM e o qCO 2 foram influenciados negativamente pelos herbicidas ametryn e trifloxysulfuron-sodium + ametryn, com maiores efeitos quanto maiores as doses. O trifloxysulfuron-sodium provocou a redução do CBM nas menores doses e incremento deste nas maiores, promovendo a redução do qCO 2 . A solubilização potencial de fosfato inorgânico decresceu com a aplicação do ametryn (47,20%) e da mistura (13,55%), sendo estimulada pelo trifloxysulfuron-sodium (25,48%). O potencial de solubilização relativa teve comportamento semelhante.Palavras-chave: biomassa microbiana, solubilização de fosfato, ametryn, trifloxysulfuron-sodium.ABSTRACT -This work aimed to evaluate the effects of herbicides and doses on the microbial activity and inorganic phosphate solubilization potential of a soil cultivated with sugarcane. The treatments were composed by the herbicides ametryn, trifloxysulfuron-sodium, and ametryn + trifloxysulfuron-sodium at 0, 1, 2, 4, and 8 times the reference doses of 10, 0.112, and 7.315 + 0.185 mg dm 3 of the active ingredient, respectively. After herbicide application, soil samples were incubated for 15 days and CO 2 evolution (C-CO 2 ) was evaluated every three days. At the end of incubation, microbial biomass carbon (MBC), metabolic quotient (qCO2), phosphate solubilization potential, and relative phosphate solubilization were evaluated for the treatments tested. C-CO 2 evolution was affected by the herbicides and increasing application doses. Trifloxysulfuron-sodium caused a reduction in C-CO 2 evolution of 10.3% in comparison to the control. MBC and qCO 2 were negatively affected by the herbicides ametryn and trifloxysulfuron-sodium + ametryn. Trifloxysulfuron-sodium reduced MBC when applied at decreasing doses; the reverse was observed for qCO 2. Phosphate solubilization potential was reduced with the application of ametryn (47.20%) and trifloxysulfuron-sodium + ametryn (13.55%), while trifloxysulfuron-sodium applied singly stimulated ...

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Rhizosphere carbon flow in trees, in comparison with annual plants: the importance of root exudation and its impact on microbial activity and nutrient availability

Cited by 892 publications

References 196 publications

Variation in carbon storage among tree species: Implications for the management of a small-scale carbon sink project

Variation in carbon storage among tree species: Implications for the management of a small-scale carbon sink project

Positive effects of plant diversity on soil microbial biomass and activity are associated with more root biomass production

Efeito de herbicidas na atividade microbiana do solo

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