Impact of fumigation with metam sodium upon soil microbial community structure in two Japanese soils

Toyota, Koki; Ritz, Karl; Kuninaga, Shiro; Kimura, Makoto

doi:10.1080/00380768.1999.10409336

Cited by 60 publications

(28 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The number of ammonia oxidizers was not reduced by the nematicides either (Table 4), although fumigants (e.g. Toyota et al 40) ) and certain herbicides and fungicides, such as propanil and 2,4-D 8,9) , bensulfuron-methyl 46) , prosulfuron, mancozeb and chlorothalonil 24) , are known to decrease numbers of nitrifying bacteria.…”

Section: Discussionmentioning

confidence: 99%

“…The density of free-living nematodes was markedly decreased by fumigation with methyl bromide and metam sodium 5) , chloropicrin 30) , and 1,3-dichloropropene and metam sodium 6) . The density of ammonia-oxidizing bacteria was severely reduced and did not recover during the experimental period after fumigation with metam sodium 40) and chloropicrin 42) in laboratory experiments. Microbial biomass significantly decreased on soil fumigation in field experiments 5,36) .…”

mentioning

confidence: 99%

See 1 more Smart Citation

Effect of Three Organophosphorous Nematicides on Non-target Nematodes and Soil Microbial Community

Wada

Toyota

2008

Microb. Environ.

Self Cite

View full text Add to dashboard Cite

The toxicity of three organophosphorous nematicides, imicyafos, fosthiazate and cadusafos, to non-target organisms in soil was evaluated. Imicyafos and fosthiazate had no significant inhibitory effect on the growth of fungal (Fusarium oxysporum f. sp. lactucae, Rhizoctonia solani and Trichoderma viride) and bacterial (Ralstonia solanacearum and Pseudomonas fluorescens) strains in media at 12.5 to 200 mg L −1 . Cadusafos, however, significantly inhibited the growth of all these strains except R. solanacearum. A pot test was conducted using a soil naturally infested with Pratylenchus penetrans, and treated with imicyafos or fosthiazate, which are less toxic to non-target organisms. The density of P. penetrans decreased to less than 10% of the control level after exposure to imicyafos and fosthiazate at 3 kg active ingredient ha −1 , the conventional dose. No significant effect was observed on the density of free-living nematodes, cellulose decomposition activity, microbial biomass evaluated with the ATP method and number of ammonia oxidizers between the soil treated with imicyafos or fosthiazate and the untreated control soil. Our results revealed that imicyafos and fosthiazate effectively suppressed a plant-parasitic nematode, P. penetrans, but had little impact on free-living nematodes and the soil microbial community.

show abstract

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Effect of Three Organophosphorous Nematicides on Non-target Nematodes and Soil Microbial Community

Wada

Toyota

2008

Microb. Environ.

Self Cite

View full text Add to dashboard Cite

show abstract

“…These general functions were important determinants of the size of the microbial biomass which represents a dynamic pool of soil organic matter and functions as a reservoir of plant available nutrients (Singh et al 1989). Particularly vulnerable microbial functional groups should be those that contain relatively low species diversity or groups that are highly specialized (Toyota et al 1999;Griffiths et al 2000). For example, all major nitrogen transformations are performed by a limited number of microorganisms; and indeed nitrification was highly sensitive to soil diversity manipulations.…”

Section: Soil Functioningmentioning

confidence: 99%

Soil microbial diversity and soil functioning affect competition among grasses in experimental microcosms

Bonkowski

Roy

2005

Oecologia

View full text Add to dashboard Cite

A gradient of microbial diversity in soil was established by inoculating pasteurized soil with microbial populations of different complexity, which were obtained by a combination of soil fumigation and filtering techniques. Four different soil diversity treatments were planted with six different grass species either in monoculture or in polyculture to test how changes of general microbial functions, such as catabolic diversity and nutrient recycling efficiency would affect the performance of the plant communities. Relatively harsh soil treatments were necessary to elicit visible effects on major soil processes such as decomposition and nitrogen cycling due to the high redundancy and resilience of soil microbial communities. The strongest effects of soil diversity manipulations on plant growth occurred in polycultures where interspecific competition between plants was high. In polycultures, soil diversity reduction led to a gradual, linear decline in biomass production of one subordinate grass species (Bromus hordeaceus), which was compensated by increased growth of two intermediate competitors (Aegilops geniculata, B. madritensis). This negative covariance in growth of competing grass species smoothed the effects of soil diversity manipulations at the plant community level. As a result, total shoot biomass production remained constant. Apparently the effects of soil diversity manipulations were buffered because functional redundancy at both, the microbial and the plant community level complemented each other. The results further suggests that small trade-offs in plant fitness due to general functional shifts at the microbial level can be significant for the outcome of competition in plant communities and thus diversity at much larger scales.

show abstract

“…However, because the government aims to reduce tillage and the use of pesticides and inorganic fertilizer, it is generally thought that the role of soil microorganisms in the decomposition and mineralization of complex organic compounds and in the reduction of plant pathogens will increase (21,25,33). On the other hand, it is expected that the application of genetically modified crops (32a) and of genetically modified microorganisms will increase, which might change bacterial community composition and affect microbial processes (8,9,39). To date, only limited information exists on microbial diversity and dynamics in agricultural soil (3,4,41).…”

mentioning

confidence: 99%

Diversity and Seasonal Fluctuations of the Dominant Members of the Bacterial Soil Community in a Wheat Field as Determined by Cultivation and Molecular Methods

Smit

Leeflang

Gommans

et al. 2001

Appl Environ Microbiol

533

324

View full text Add to dashboard Cite

There is a paucity of knowledge on microbial community diversity and naturally occurring seasonal variations in agricultural soil. For this purpose the soil microbial community of a wheat field on an experimental farm in The Netherlands was studied by using both cultivation-based and molecule-based methods. Samples were taken in the different seasons over a 1-year period. Fatty acid-based typing of bacterial isolates obtained via plating revealed a diverse community of mainly gram-positive bacteria, and only a few isolates appeared to belong to the Proteobacteria and green sulfur bacteria. Some genera, such as Micrococcus, Arthrobacter, and Corynebacterium were detected throughout the year, while Bacillus was found only in July. Isolate diversity was lowest in July, and the most abundant species, Arthrobacter oxydans, and members of the genus Pseudomonas were found in reduced numbers in July. Analysis by molecular techniques showed that diversity of cloned 16S ribosomal DNA (rDNA) sequences was greater than the diversity among cultured isolates. Moreover, based on analysis of 16S rDNA sequences, there was a more even distribution among five main divisions, Acidobacterium, Proteobacteria, Nitrospira, cyanobacteria, and green sulfur bacteria. No clones were found belonging to the gram-positive bacteria, which dominated the cultured isolates. Seasonal fluctuations were assessed by denaturing gradient gel electrophoresis. Statistical analysis of the banding patterns revealed significant differences between samples taken in different seasons. Cluster analysis of the patterns revealed that the bacterial community in July clearly differed from those in the other months. Although the molecule-and cultivationbased methods allowed the detection of different parts of the bacterial community, results from both methods indicated that the community present in July showed the largest difference from the communities of the other months. Efforts were made to use the sequence data for providing insight into more general ecological relationships. Based on the distribution of 16S rDNA sequences among the bacterial divisions found in this work and in literature, it is suggested that the ratio between the number of Proteobacteria and Acidobacterium organisms might be indicative of the trophic level of the soil.

show abstract

Impact of fumigation with metam sodium upon soil microbial community structure in two Japanese soils

Cited by 60 publications

References 37 publications

Effect of Three Organophosphorous Nematicides on Non-target Nematodes and Soil Microbial Community

Effect of Three Organophosphorous Nematicides on Non-target Nematodes and Soil Microbial Community

Soil microbial diversity and soil functioning affect competition among grasses in experimental microcosms

Diversity and Seasonal Fluctuations of the Dominant Members of the Bacterial Soil Community in a Wheat Field as Determined by Cultivation and Molecular Methods

Contact Info

Product

Resources

About