Effects of charcoal addition on N2O emissions from soil resulting from rewetting air-dried soil in short-term laboratory experiments
Effects of charcoal addition on N2O emissions from soil resulting from rewetting air-dried soil in short-term laboratory experiments
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DOI：
10.1111/j.1747-0765.2007.00123.x
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发表时间：
2007-04
影响因子：
2
通讯作者：
Yosuke Yanai;K. Toyota;M. Okazaki
中科院分区：
文献类型：
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作者：
Yosuke Yanai;K. Toyota;M. Okazaki
摘要通过室内试验研究了添加木炭对风干土壤再湿润过程中N2 O排放的影响。在73%和83%充水孔隙（WFPS）的土壤中再湿润，在再湿润后6 h引起N2 O排放峰值，在整个120 h培养期内的累积N2 O排放量分别为11 ± 1和13 ± 1 mg N m−2。然而，在64%WFPS的再润湿没有引起可检测的N2 O排放（-0.016 ± 0.082 mg N m−2），这表明对土壤水分的严重敏感性。当土壤在73%和78%WFPS下复湿时，添加10wt%的木炭可抑制89%的N2 O排放。相比之下，除了从木炭的灰分没有抑制N2 O的排放量从土壤再润湿在73%的WFPS。添加活性炭还显著促进了83% WFPS复湿土壤N2 O的释放（P < 0.01）。此外，KCl和K2 SO 4的加入并没有显示出N2 O排放模式的明显差异，尽管Cl−和SO2− 4是木炭中的主要阴离子，对N2 O还原活性有不同的影响。这些结果表明，通过添加木炭抑制N2 O排放可能不会导致刺激的N2 O还原活性在土壤中，因为土壤化学性质的变化。
Abstract Laboratory experiments were conducted to examine the effect of charcoal addition on N2O emissions resulting from rewetting of air-dried soil. Rewetting the soil at 73% and 83% of the water-filled pore space (WFPS) caused a N2O emission peak 6 h after the rewetting, and the cumulative N2O emissions throughout the 120-h incubation period were 11 ± 1 and 13 ± 1 mg N m−2, respectively. However, rewetting at 64% WFPS did not cause detectable N2O emissions (−0.016 ± 0.082 mg N m−2), suggesting a severe sensitivity to soil moisture. When the soils were rewetted at 73% and 78% WFPS, the addition of charcoal to soil at 10 wt% supressed the N2O emissions by 89% . In contrast, the addition of the ash from the charcoal did not suppress the N2O emissions from soil rewetted at 73% WFPS. The addition of charcoal also significantly stimulated the N2O emissions from soil rewetted at 83% WFPS compared with the soil without charcoal addition (P < 0.01). Moreover, the addition of KCl and K2SO4 did not show a clear difference in the N2O emission pattern, although Cl− and SO2− 4, which were the major anions in the charcoal, had different effects on N2O-reducing activity. These results indicate that the suppression of N2O emissions by the addition of charcoal may not result in stimulation of the N2O-reducing activity in the soil because of changes in soil chemical properties.