the traditional bio-denitrogenation is built up of aerobic nitrification and anaerobic denitrification, the nitrifier are as follow: ammonia -oxidizing bacteria and nitrosomonas, ammonia-oxidizing bacteria includes Nitrosomonas、 Nitrosoccus、 Nitrosospira and Nitrosolobus et al.
The respiratory intensity of the contaminated soil decreased by 29.93% while ammonification and nitrification increased significantly over that of control soil.
The results indicated that heterotrophic nitrification or aerobic denitrification was the main process producing N2O at 30% WFPS. N2O emission from autotrophic nitrification only accounted for 15.2%~47.2% of that from heterotrophic nitrification or aerobic denitrification.
The order of four soil biochemical intensity being sensitive to heavy metal pollution indicated as: nitrification>nitrogen fixation>decomposition of cellulose>ammonification.
Nitrification, performed oxidation of ammonia to nitrate by nitrifying bacteria is a key process in the cycling of nitrogen and an impotent component of modern wastewater treatment.
Low levels of NO3- in these forest soils generally correspond to low net rates of nitrification.
Nitrification and denitrification in subalpine coniferous forests of different restoration stages in western Sichuan, China
Nitrification is the biological conversion of organic or inorganic nitrogen compounds from a reduced to a more oxidized state.
The results showed that forest restoration stage had no significant effects on gross nitrification rates or denitrification rates (One-way ANOVA (analysis of variance), p >amp;lt; 0.05).
There was no significant difference in the temperature coefficient (Q10) for gross nitrification rate among all the forest sites (One-way ANOVA, p >amp;lt; 0.05).
It is fristly reported that hydroguinone (HQ) as urease inhibitor used in the clay soil and the sandy loam soil, the measure could effectively alleviate the restraining affect to nodulation and activity of nodule fixed-N of nodulated soybean caused by urea hydrolysate and its followed oxidate. The results were showed as following:1 . There were no adverse effects on the growth of soybean seedings and the primary nodulation within the concentaticn of 40 ppm HQ; whereas, the number of primary nodulalion was significantly...
It is fristly reported that hydroguinone (HQ) as urease inhibitor used in the clay soil and the sandy loam soil, the measure could effectively alleviate the restraining affect to nodulation and activity of nodule fixed-N of nodulated soybean caused by urea hydrolysate and its followed oxidate. The results were showed as following:1 . There were no adverse effects on the growth of soybean seedings and the primary nodulation within the concentaticn of 40 ppm HQ; whereas, the number of primary nodulalion was significantly inhibited as HQ concentation increased over 40 ppm because the root system was deformed and the growing was contralled.2. HQ(10 to 50 ppm)could increased to the absorbing O2(79.4 to 86.1%) and the activity of succinic dehydrogenase (124.2 to 138.4%) in the active nodule isolated from the growing period of soybean.3 . Boths data from the experments of the pots and the small areas of fields suggested: as urea hydrolysis was alleviated by HQ, the number of dulation and activity of noduled fixed-N (acclylence reduction activity) were inhibited by urea was significantly decreased. The analysis of solution nitrogen form from the soybean xylem sap (amide, ureide and nitrification) further indicated the tight correlation between the nitrogen form of soybean plant translate from root to aboveground and the translate intensity of soil nitrogen or intensity of odule fixed-N (ureides relative abundance).4 . Because the soil urease activity was enhanced by applying the wheat -straw, the number of HQ might he increased, and meanwhile, the inhibi-tation of urea on the nodulation and activity of nodule fixed-N were totally removed by applying wheat-straw as the "nitrogen factor effect" and provide abundant soil nitrogen resources were offered for the seed-growing of soybean.
To study the effects of acid precipition on soil microbial activity, columns containing samples of mountain forest soils ( 0 - 5cm) from Nanning and Liuzhou were leached with a continuous application of 1280mm of simulated precipitation (pH5. 6 - 3. 1). The extent of reduction of soil respiration depended on the characteristics of soil and the pH of acid rain. The nitrification was significantly inhibited by simulated acid rain of pH3. 1. The stimulating or inhibiting effect on organic nitrogen mineralization...
To study the effects of acid precipition on soil microbial activity, columns containing samples of mountain forest soils ( 0 - 5cm) from Nanning and Liuzhou were leached with a continuous application of 1280mm of simulated precipitation (pH5. 6 - 3. 1). The extent of reduction of soil respiration depended on the characteristics of soil and the pH of acid rain. The nitrification was significantly inhibited by simulated acid rain of pH3. 1. The stimulating or inhibiting effect on organic nitrogen mineralization in soil following continuous treatment of simulated acid rain of pH3. 7 and pH3. 1 depended on the soil characteristics. The effects of simulated acid rain on soil enzyme activities was stimulated, inhibited, or not affected depending on the characteristics of soil and enzymes.
The restraining rate and lasting time to soil urease activity by hydro-quinone has positive correlation with the HQ strength and negative correlation with the soil urease activity. HQ can effectively restrain the volatilization of ammonia been dressed in soil and produce strong restraint to the nitrification strength of urea and ammonium salt.In soil dressed wheat stem, as urease activity is increased, the hydrolysis speed of urea that be dressed into soil is accelerated, so the usease of HQ should be...
The restraining rate and lasting time to soil urease activity by hydro-quinone has positive correlation with the HQ strength and negative correlation with the soil urease activity. HQ can effectively restrain the volatilization of ammonia been dressed in soil and produce strong restraint to the nitrification strength of urea and ammonium salt.In soil dressed wheat stem, as urease activity is increased, the hydrolysis speed of urea that be dressed into soil is accelerated, so the usease of HQ should be added. While as the N factor effect of wheat stem, the catabolite and oxidized product of urea are fixed, thus the possible urea loss continued after the Hq become invalid is made up.
nitrification
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