| Effect of film mulching and nitrogen fertilizer on CH4 absorption of rainfed spring maize farmland |
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| DOI：10.7606/j.issn.1000-7601.2017.04.01 |
| Key Words: film mulching nitrogen fertilizer CH4 rained spring maize farmland |
| Author Name | Affiliation | | LI Xiao-sha | College of Resources and Environment, Northwest A&F University, Yangling 712100, Shannxi
State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling 712100, Shannxi | | YUE Shan-chao | State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling 712100, Shannxi | | LI Shi-qing | College of Resources and Environment, Northwest A&F University, Yangling 712100, Shannxi
State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling 712100, Shannxi | | LIU Jian-can | College of Resources and Environment, Northwest A&F University, Yangling 712100, Shannxi
State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling 712100, Shannxi |
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| Abstract: |
| Understanding the response of CH4 absorption to film mulching and nitrogen fertilizer is of value for improving management practices. We monitored the CH4 absorption from plastic film-mulched and no-mulched maize fields that received different N application rates (0, 100, 250 kg·hm-2 and 400 kg·hm-2) using the static chamber technique. In addition, the impact factors (soil inorganic nitrogen, soil temperature and moisture, etc.) were estimated. The results showed that the rain-fed maize fields acted as a sink for CH4, and 48%～60% of the annual uptake was during the fallow period. The annual CH4 uptake rate was 0.99, 1.38, 1.3, 1.37, 1.43, 1.77, 1.68, 1.56 CH4-C kg·hm-2 for FM0, FM100, FM250, FM400, BP0, BP100, BP250 and BP400 treatment in 2014—2015, respectively. Both film mulching and N fertilizer did not increase the CH4 uptake. The soil CH4 uptake was positively correlated with 0 cm and 10 cm soil temperature, but negatively correlated with soil WFPS and soil NH4+-N concentration. The CH4 uptake was negatively correlated with soil NO3--N concentration under no-mulched treatments. |
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