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首页> 外文期刊>Ecosystems >Microbial N Turnover and N-Oxide (N2O/NO/NO2) Fluxes in Semi-arid Grassland of Inner Mongolia
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Microbial N Turnover and N-Oxide (N2O/NO/NO2) Fluxes in Semi-arid Grassland of Inner Mongolia

机译：内蒙古半干旱草原微生物群落氮素流失及氮氧化物（N2 O / NO / NO2 ）通量

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摘要

Gross rates of N mineralization and nitrification, and soil–atmosphere fluxes of N2O, NO and NO2 were measured at differently grazed and ungrazed steppe grassland sites in the Xilin river catchment, Inner Mongolia, P. R. China, during the 2004 and 2005 growing season. The experimental sites were a plot ungrazed since 1979 (UG79), a plot ungrazed since 1999 (UG99), a plot moderately grazed in winter (WG), and an overgrazed plot (OG), all in close vicinity to each other. Gross rates of N mineralization and nitrification determined at in situ soil moisture and soil temperature conditions were in a range of 0.5–4.1 mg N kg?1 soil dry weight day?1. In 2005, gross N turnover rates were significantly higher at the UG79 plot than at the UG99 plot, which in turn had significantly higher gross N turnover rates than the WG and OG plots. The WG and the OG plot were not significantly different in gross ammonification and in gross nitrification rates. Site differences in SOC content, bulk density and texture could explain only less than 15% of the observed site differences in gross N turnover rates. N2O and NO x flux rates were very low during both growing seasons. No significant differences in N trace gas fluxes were found between plots. Mean values of N2O fluxes varied between 0.39 and 1.60 μg N2O-N m?2 h?1, equivalent to 0.03–0.14 kg N2O-N ha?1 y?1, and were considerably lower than previously reported for the same region. NO x flux rates ranged between 0.16 and 0.48 μg NO x -N m?2 h?1, equivalent to 0.01–0.04 kg NO x -N ha?1 y?1, respectively. N2O fluxes were significantly correlated with soil temperature and soil moisture. The correlations, however, explained only less than 20% of the flux variance.
机译：在中国内蒙古锡林河流域不同放牧和未湿润的草原草地上，测量了N矿化和硝化的总速率以及N2 O，NO和NO2 的土壤-大气通量，在2004年和2005年的生长季节。实验地点是自1979年以来未进行土地整理的土地（UG79），自1999年以来未进行土地整理的土地（UG99），冬季中度放牧的土地（WG）和过度放牧的土地（OG），它们彼此紧邻。在原位土壤水分和土壤温度条件下测定的总氮矿化和硝化速率在0.5–4.1 mg N kg？1 土壤干重日？1 的范围内。 2005年，UG79地块的总N周转率明显高于UG99地块，而UG99地块的总N周转率比WG和OG地块高得多。 WG和OG图的总氨化率和总硝化率没有显着差异。 SOC含量，堆积密度和质地的位点差异只能解释少于总N周转率所观察到的位点差异的15％。在两个生长季节中，N2 O和NO x 的通量率都很低。在各图之间未发现N痕量气体通量的显着差异。 N2O通量平均值在0.39至1.60μgN2ON m？2 h？1 之间变化，相当于0.03-0.14 kg N2ON ha ？1 y？1 ，并且比以前针对相同区域的报告要低得多。 NO x -的通量率介于0.16和0.48μgNO x -N m？2 h？1 之间，相当于0.01–0.04 kg NO x - N ha？1 y？1 。 N2O通量与土壤温度和土壤水分显着相关。然而，相关性仅解释了不到磁通变化的20％。

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