ice straw at low levels (1 mg.g71 soil) alleviated the
inhibitory effect of heavy metals including that of Cr
in the alluvial soil under flooded condition (Table 5).
On the other hand, application of higher levels of rice
straw (10 mg.g71
) inhibited CH4 oxidation in the uamended
soil (Table 6) and did not alleviate the heavy metal
toxicity. At higher levels of rice straw application, CH4
oxidation was marginally stimulated by Cu and inhibited
by Cr and Ni.
Cumulative CO2 production was inhibited by Cd and Ni
but stimulated following Cu and Zn amendment. CO2
production was higher in 10 mg.g71 rice straw-amended
soil than at 1 mg.g71 rice straw-amended soil under flooded
conditions (Table 7). Interestingly, Zn stimulated and Cr
and Ni inhibited CO2 production, especially at high levels
(10 mg.g71
) of straw amendment. The stimulatory effect of
Cu on cumulative CO2 production was not evident in rice
straw-amended soil.
Application of urea at 20 mg N.g71 soil inhibited CH4
oxidation in unamended flooded alluvial soil, while a
marginal stimulation occurred in heavy metal amended
soils (Table 8), with the exception of Cr. Cr application
significantly inhibited CH4 oxidation in soils supplemented
with urea–N. Cumulative CO2 production (Table 7) was
also not influenced in urea-treated and heavy metalamended
soils.
CH4-oxidizing bacterial population was stimulated
by Cu, while Cr inhibited them in the alluvial soil at
60% MHC (Table 9). Methanotrophic bacterial population
was higher under flooded conditions than at
60% MHC. Under flooded conditions, application of Cu
and Ni stimulated the methanotrophic population, while
ice straw at low levels (1 mg.g71 soil) alleviated theinhibitory effect of heavy metals including that of Crin the alluvial soil under flooded condition (Table 5).On the other hand, application of higher levels of ricestraw (10 mg.g71) inhibited CH4 oxidation in the uamendedsoil (Table 6) and did not alleviate the heavy metaltoxicity. At higher levels of rice straw application, CH4oxidation was marginally stimulated by Cu and inhibitedby Cr and Ni.Cumulative CO2 production was inhibited by Cd and Nibut stimulated following Cu and Zn amendment. CO2production was higher in 10 mg.g71 rice straw-amendedsoil than at 1 mg.g71 rice straw-amended soil under floodedconditions (Table 7). Interestingly, Zn stimulated and Crand Ni inhibited CO2 production, especially at high levels(10 mg.g71) of straw amendment. The stimulatory effect ofCu on cumulative CO2 production was not evident in ricestraw-amended soil.Application of urea at 20 mg N.g71 soil inhibited CH4oxidation in unamended flooded alluvial soil, while amarginal stimulation occurred in heavy metal amendedsoils (Table 8), with the exception of Cr. Cr applicationsignificantly inhibited CH4 oxidation in soils supplementedwith urea–N. Cumulative CO2 production (Table 7) wasalso not influenced in urea-treated and heavy metalamendedsoils.CH4-oxidizing bacterial population was stimulatedby Cu, while Cr inhibited them in the alluvial soil at60% MHC (Table 9). Methanotrophic bacterial populationwas higher under flooded conditions than at60% MHC. Under flooded conditions, application of Cuand Ni stimulated the methanotrophic population, while
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