| Autor: |
Ahirwar, Usha1, Dubey, Garima1, Singh, Neera2, Mohanty, Santosh Ranjan1 santosh.mohanty@icar.gov.in, Kollah, Bharati1 |
| Předmět: |
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| Zdroj: |
Ecotoxicology & Environmental Safety. Aug2018, Vol. 157, p409-416. 8p. |
| Abstrakt: |
Climate change may increase the pest infestation leading to intensive use of insecticides. However, the effect of insecticide and climate factors on soil methane (CH 4 ) consumption is less understood. A laboratory experiment was carried out to evaluate the effect of temperature (15 °C, 35 °C, and 45 °C), moisture holding capacity (MHC) (60%, 100%), biochar (0%, 1%) and chlorpyrifos (0 ppm, 10 ppm) on CH 4 consumption and microbial abundance in a tropical Vertisol of central India. Methane consumption rate k (ng CH 4 consumed g −1 soil d −1 ) varied from 0.065 ± 0.005 to 0.608 ± 0.018. Lowest k was in 15 °C-60% moisture holding capacity (MHC)-no biochar and with 10 ppm chlorpyrifos. Highest k was in 35 °C-100% MHC-1% biochar and without (0 ppm) chlorpyrifos. Cumulative CO 2 production (ng CO 2 produced g −1 soil d −1 ) varied from 446 ± 15 to 1989 ± 116. Both CH 4 consumption and CO 2 production peaked in the treatment of 35 °C-100% MHC-1% biochar. Chlorpyrifos inhibited CH 4 consumption irrespective of treatments. Abundance of 16S rRNA of eubacteria (× 10 6 g −1 soil) varied from 2.33 ± 0.58 to 85.67 ± 7.00. Abundance of 16S rRNA genes representing Actinomycetes (× 10 4 g −1 soil) varied from 7.67 ± 1.53 and pmoA gene (Methanotrophs) (× 10 5 g −1 soil) varied from 1.23 ± 0.59 to 34.33 ± 6.51. Chlorpyrifos inhibited abundance of heterotrophic bacteria and methanotrophs but stimulated actinomycetes. Biochar stimulated the CH 4 consumption, CO 2 production and microbial abundance. Study highlighted that use of chlorpyrifos under climate change factors may inhibit CH 4 consumption but the use of biochar may alleviate the negative effect of the chlorpyrifos. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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Full Text from ScienceDirect