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L. Dendooven C. Vega-Jarquin C. Cruz-Mondragon O. Van Cleemput R. Marsch 《Plant and Soil》2006,279(1-2):243-252
Induction of assimilatory NO
3
−
reduction through the application of an easily decomposable substrate in alkaline–saline soils of the former lake Texcoco
(Mexico) resulted in a fast immobilization of NO
3
−
in excess of N required for metabolic activity and the release of large concentrations of NO
2
−
and smaller amounts of NH
4
+
. We postulated that this was regulated by the amounts of NO
3
−
and glucose added, and affected by the specific characteristics of soil from the former lake Texcoco. This was investigated
by spiking soils of different electrolytic conductivity (EC) 56.0 dS m−1 (soil A of Texcoco) and 11.6 dS m−1 (soil B of Texcoco) with different concentrations of NO
3
−
and glucose while dynamics of CO2, NH
4
+
, NO
2
−
and NO
3
−
were monitored in an aerobic incubation for 7 days. For comparison reasons (control) an agricultural soil with low EC (0.3 dS
m−1) was included as well. In the agricultural soil, 67% of the added glucose mineralized within 7 days, but only 15% in soil
A of Texcoco and 20% in soil B of Texcoco. The application of NO
3
−
to the agricultural soil added with glucose increased cumulative production of CO2 1.2 times, 1.5 times in soil A of Texcoco and 1.8 times in soil B of Texcoco. Concentration of NO
2
−
increased to > 100 mg NO
2
−
-N kg−1 when 1000 mg glucose-C kg−1 and 500 mg NO
3
−
-N kg−1 were added to soil A and B of Texcoco, but remained < 3 mg NO
2
−
-N kg−1 in the agricultural soil. The ratio between the cumulative production of CO2 and the decrease in concentration of NO
3
−
was approximately one in soil A and B of Texcoco, but 10 in the agricultural soil after 3 days. It was found that micro-organisms
in the alkaline–saline soil of the former lake Texcoco were capable of immobilizing large quantities of NO
3
−
when an easy decomposable substrate was available in excess of what might be required for metabolic activity while producing
large concentrations of NO
2
−
, but these phenomena were absent in an agricultural soil. In soil of Texcoco, concentrations of NO
2
−
and NH
4
+
increased with increased salinity and availability of NO
3
−
. This ability to remove large quantities of NO
3
−
under these conditions and then utilize it at a later time might benefit micro-organisms of the N limited alkaline–saline
soils of Texcoco. 相似文献
2.
Ruiz-Romero E. Alcántara-Hernández R. Cruz-Mondragon C. Marsch R. Luna-Guido M. L. Dendooven L. 《Plant and Soil》2009,319(1-2):247-257
Plant and Soil - Extreme alkalinity and salinity affects different processes involved in the N cycle, such as mineralization and nitrification, so it might affect the denitrification process and... 相似文献
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