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[1]马智勇,贾俊香,熊正琴,等.典型菜地土壤剖面N2O浓度、扩散通量与净周转率变化[J].应用与环境生物学报,2019,25(03):611-616.[doi:10.19675/j.cnki.1006-687x.201901032]
 MA Zhiyong,JIA Junxiang**,XIONG Zhengqin,et al.Dynamics of N2O concentration, diffusion flux, and net turnover rate in the soil profile of a typical vegetable field[J].Chinese Journal of Applied & Environmental Biology,2019,25(03):611-616.[doi:10.19675/j.cnki.1006-687x.201901032]
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典型菜地土壤剖面N2O浓度、扩散通量与净周转率变化()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
25卷
期数:
2019年03期
页码:
611-616
栏目:
研究论文
出版日期:
2019-06-25

文章信息/Info

Title:
Dynamics of N2O concentration, diffusion flux, and net turnover rate in the soil profile of a typical vegetable field
作者:
马智勇贾俊香熊正琴许剑敏王玲张菁
1山西农业大学资源环境学院,山西农业大学资源与环境国家级实验教学示范中心 太谷 030801 2南京农业大学资源与环境科学学院,江苏省低碳农业与温室气体减排重点实验室 南京 210095
Author(s):
MA Zhiyong1 JIA Junxiang1** XIONG Zhengqin2 XU Jianmin1 WANG Ling1 & ZHANG Jing1
1 College of Resources and Environment, National Experimental Teaching Demonstration Center for Agricultural and Environmental, Shanxi Agricultural University, Taigu 030801, China 2 Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation / College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
关键词:
菜地土壤剖面氧化亚氮扩散通量净周转率
Keywords:
vegetable plot soil profile nitrous oxide diffusive flux net turnover rate
分类号:
S153
DOI:
10.19675/j.cnki.1006-687x.201901032
摘要:
利用地下气体原位采集系统-气相色谱法,周年监测休耕裸地与轮作菜地(茼蒿-空心菜-大青菜)7、15、30和50 cm土层N2O浓度变化,旨在探究菜地土壤剖面N2O扩散通量变化和净周转率. 结果显示:菜地土壤剖面N2O浓度呈现较大的时空变异性,轮作菜地7、15、30和50 cm土层N2O平均浓度分别达到休耕裸地对应土层的1.9、8.7、9.2与26.7倍,0-30 cm土层土壤N2O浓度随土层深度增加而增加,30-50 cm土层逐渐降低,表明氮肥施用显著促进了上层土体内N2O的产生. 休耕裸地与轮作菜地4个土层N2O扩散通量(以N计)变幅分别为-354-420 μg m-2 h-1与482-1 510 μg m-2 h-1,其中休耕裸地30-50 cm土层N2O扩散通量为负值,表明该土层N2O以吸收为主. 轮作菜地7-15 cm土层N2O扩散通量最高为1 510 μg m-2 h-1,分别比0-7 cm、15-30 cm与30-50 cm高68.1%、2.5%与36.6%,表明7-30 cm为N2O的主要产生位点. 休耕裸地与轮作菜地0-15 cm土层间N2O净周转率以负值为主,15-50 cm以正值为主,表明N2O的周转在土壤剖面中层(7-30 cm)最快. 综上,N2O浓度在土层中的分布情况为从上到下先增加后减少,主要产生位点于30 cm土层并从该层向其上下层扩散输送;结果可为菜地土壤N2O产生位点的定位及其转化过程的研究提供参考. (图4 表2 参33)
Abstract:
The concentrations of nitrous oxide (N2O) at 7, 15, 30, and 50 cm soil depths under bare fallow, rotation vegetable field (rotation of Garland chrysanthemum-Tung choy-Bok choy) were monitored using a special in situ soil gas collection device and gas chromatography, to explore the production site, diffusion flux, and net turnover rate of N2O in soil profiles. The results showed that the concentration profile of N2O was dramatically spatially and temporally variable. Average N2O concentration at depths of 7 cm, 15 cm, 30 cm, and 50 cm from rotation vegetable field were 1.9, 8.7, 9.2, and 26.7 times that in the corresponding soil layer from the bare fallow field, respectively. Average N2O concentration increased with soil depth within the range of 0–30 cm soil layer, then decreased at the depth of 30–50 cm. These indicated that large nitrogen fertilizer application promoted N2O production at the top soil layers. The diffusion fluxes ranged from -354 to 420 μg N m-2 h-1 in bare fallow and 482 to 1 510 μg N m-2 h-1 in rotation field, respectively. It was concluded that N2O was mainly absorbed by soil at the 30–50 cm layer according to negative N2O diffusion fluxes value at the same soil layer. The diffusion fluxes at the 7–15 cm layer in the rotation field, which was as high as 1 510 μg N m-2 h-1, were higher by 68.1%, 2.5%, and 36.6% than those at 0–7 cm, 15–30 cm, and 30–50 cm soil layers, respectively. Therefore, the key site of N2O production was at depths of 7–30 cm in the soil profile. Net N2O turnover rates from bare fallow and rotation vegetable were negative at the 0–15 cm soil layer but positive at the 15–50 cm. It was concluded that the fastest N2O turnover occurred in the middle layer of the soil profile (7–30 cm). In conclusion, the distribution of N2O concentration first increased and then decreased with the increase in N2O concentration. N2O was mainly produced at the depth of 30 cm and was diffused to ambient. These results could be used as references for understanding N2O production sites and transformation process in vegetable field ecosystems.

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更新日期/Last Update: 2019-06-25