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[1]王刚,杨宪龙,李渊,等.陇东旱塬苜蓿草地N2O排放特征及其对施氮的响应[J].应用与环境生物学报,2018,24(03):450-456.[doi:10.19675/j.cnki.1006-687x.2017.06039]
 WANG Gang,YANG Xianlong,LI Yuan,et al.Characteristics of N2O emission from Medicago sativa stands and its response to nitrogen fertilizers in the Longdong dryland Plateau[J].Chinese Journal of Applied & Environmental Biology,2018,24(03):450-456.[doi:10.19675/j.cnki.1006-687x.2017.06039]
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陇东旱塬苜蓿草地N2O排放特征及其对施氮的响应()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
24卷
期数:
2018年03期
页码:
450-456
栏目:
研究论文
出版日期:
2018-06-30

文章信息/Info

Title:
Characteristics of N2O emission from Medicago sativa stands and its response to nitrogen fertilizers in the Longdong dryland Plateau
作者:
王刚杨宪龙李渊丁新宇沈禹颖
兰州大学草地农业科技学院,草地农业生态系统国家重点实验室,农业农村部草牧业创新重点实验室 兰州 730020
Author(s):
WANG Gang YANG Xianlong LI Yuan DING Xinyu & SHEN Yuying**
College of Pastoral Agriculture Science and Technology, Lanzhou University, State Key Laboratory of Grassland Agro-ecosystems of Lanzhou University, Ministry of Agriculture and Rural Affairs Key Laboratory of Grassland Livestock Industry Innovation, Lanzhou 730020, China
关键词:
N2O排放日动态降雨施氮影响因素
Keywords:
N2O emission daily dynamics rainfall nitrogen application influencing factor
分类号:
CLC X154.1
DOI:
10.19675/j.cnki.1006-687x.2017.06039
摘要:
采用LGR-N2O/CO气体分析仪研究陇东旱塬苜蓿草地N2O排放特征、影响因素及其对施氮的响应. 试验设N 0 kg hm-2(N0)和150 kg hm-2(N150)两个施氮处理. 结果表明,监测期N0和N150处理的N2O排放通量平均分别为-0.0036和0.0118 mg m-2 h-1,N150处理较N0处理明显增加. N2O排放通量具有明显的日变化特征,表现为先降低后增加的趋势. 回归分析表明,N2O排放通量与表层10 cm土壤含水量表现为显著的正相关关系,降雨天N2O排放通量较非降雨天值升高131.3%. 同时,N2O排放通量随着表层10 cm土壤温度的升高表现为减低的趋势. 日排放特征表明,以9:00-11:00时测定的N2O通量值为基础推算日尺度或更长时间尺度的N2O排放通量时可能存在明显低估的现象. 综上所述,陇东苜蓿草地N2O排放受降水和施氮的深刻影响,且具有明显的日动态特征,建议通过仪器连续动态测定加强N2O排放通量数据的准确性和代表性. (图6 表1 参38)
Abstract:
Nitrous oxide (N2O) is one of the potent greenhouse gases (GHG) that depletes the stratospheric ozone. Nitrogen fertilizers are considered to be a major source of nitrous oxide (N2O) emissions from arable soils. To investigate the characteristics of N2O emission, its influencing factors, and its response to nitrogen application in dry grassland in the Loess Plateau, one of the most intensively used agricultural regions in China, we conducted a field trial with two treatments including N0 (0 kg hm?2) and N150 (150 kg hm?2) at the Qingyang Loess Plateau grassland agricultural research station of Lanzhou University. An LGR-N2O/CO gas analyzer was used to monitor the emissions. The results showed that the N2O fluxes of the N0 and N150 treatments during the monitoring period were -0.0036 and 0.0118 mg m-2 h-1, respectively; the flux in case of the N150 treatment was significantly higher than that for the N0 treatment. The N2O emission flux has a distinct diurnal variation characteristic, which first showed the trend of decreasing and then increasing. Regression analysis indicated a significant positive correlation between the N2O flux and the surface soil water content at a depth of 10 cm. The N2O emission flux increased by 131.3%, compared with that during the non-precipitation days. At the same time, the N2O emission flux showed a trend of decreasing with the increase of the surface soil temperature at a depth of 10 cm. The daily emission characteristics indicated that there may be a significant underestimation of the N2O flux at the daily or longer time-scale, based on the N2O flux value measured at 9:00–11:00. In summary, the N2O emissions from the sown alfalfa grassland of the eastern Gansu are strongly affected by precipitation and nitrogen application and have obvious daily dynamic characteristics. It is recommended that the accuracy and representativeness of N2O emission flux data be enhanced by continuous dynamic measurement using the instrument.

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更新日期/Last Update: 2018-06-30