[Objective]The processes and characteristics of nitrogen mineralization in lime concretion black soil in the north of Huai River of Anhui Province were studied at various temperatures (10, 20 and 30 ℃ ) and different C/N ratios. [ Method]The interval leached aerial incubation was adopted. [ Result] The mineralized nitrogen accumulation increased with the temperature rising from 10 ℃ to 30 ℃ while moisture and aerated conditions were good. Ammoniacal nitrogen ( NH4+ -N) mineralization was faster at initial stage then slow as the extension of incubation time, and nitrate nitrogen ( NO3 -N) mineralization was a gradual change with the prolonging of time. Organic nitrogen mineralization was deeply affected by the temperature. Low temperature inhibited NO3- -N mineralization and it became more significantly when the C/N ratios was high. The proportion of NH4+ -N was higher than that of NO3--N at the initial stage,and it revealed contrary trend at the last stage. The soil nitrogen mineralization potential Nn and nitrogen mineralization rale constant Ko were calculated from one-pool model, which were affected by different temperatures and C/N ratios. No increased with the increase of the temperature, while under the same condition of incubation temperature , iVo would be increased with the increase of C/N ratios. There were close relationships between Ko and V,/fi ratios, while under the same temperature condition the C/N ratios increased but Ko decreased. [Conclusion] Organic nitrogen mineralization was deeply affected by the temperature, and soil nitrogen net mineralized amount increased as the extension of incubation time under different treatments. The result was analyzed with non-linear regression procedure of SPSS software, which indicated that one-pool model could significantly fit the experimental data.
国家科技期刊平台
NSTL
万方数据
维普
