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| Effects of tillage methods and nitrogen fertilizer reduction on soil enzyme activities and greenhouse gas emissions of wheat yellow cinnamon soil |
| Received:May 27, 2019 |
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| KeyWord:tillage method;nitrogen fertilizer reduction;soil enzyme activity;greenhouse gas |
| Author Name | Affiliation | E-mail | | ZHANG Zhi-yong | College of Agronomy, Henan Agricultural University, Zhengzhou 450002, China | | | YU Xu-hao | College of Agronomy, Henan Agricultural University, Zhengzhou 450002, China | | | XIONG Shu-ping | College of Agronomy, Henan Agricultural University, Zhengzhou 450002, China | | | MA Xin-ming | College of Agronomy, Henan Agricultural University, Zhengzhou 450002, China | xinmingma@126.com | | WANG Xiao-chun | College of Life Science, Henan Agricultural University, Zhengzhou 450002, China | | | LIU Yang | College of Agronomy, Henan Agricultural University, Zhengzhou 450002, China | | | YAN Guang-xuan | School of Environment, Henan Normal University, Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, Xinxiang 453007, China | | | LI Yong-ge | Anyang Agricultural Environment Monitoring Station, Anyang 455000, China | |
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| Abstract: |
| To investigate the effects of different tillage methods and nitrogen fertilizer application on soil enzyme activities and greenhouse gas emissions after cultivating corn stalks were smashed and returned to the field. By using static box gas chromatography method, and conventional tillage and nitrogen application(PT + CN)as control, we measured and analyzed the effects of no-tillage and nitrogen reduction (NT+LN), no-tillage conventional nitrogen application(NT+CN), rotary tillage and nitrogen reduction(RT+LN), rotary-tillage and conventional nitrogen application(RT+CN), and conventional tillage and nitrogen reduction(PT+LN)on greenhouse gas emissions from wheat soil system and the relationship with soil enzyme activity. The results of two consecutive years of experiments showed that soil urease and sucrase activities in layer 0~20 cm were higher than that of 20~40 cm. The urease and sucrase activities were highest at the jointing stage. Reduced nitrogen application decreased the soil urease and sucrase activity, with soil urease and sucrase activities at their lowest with NT+ LN treatment. All wheat field treatments showed as the CH4 sink and CO2 and N2O sources. Compared with the control treatment, the average absorption fluxes of CH4 in NT+LN, RT+LN, PT+LN, NT+CN, and RT+CN decreased by 25.57%, 25.06%, 18.03%, 11.96%, and 11.61%, respectively. The average emission fluxes of CO2 and N2O decreased by 17.57%, 12.28%, 11.36%, 10.24%, and 4.96%; and 34.05%, 26.48%, 20.60%, 15.61%, and 3.02%, respectively. Soil urease was negatively correlated with CH4 emission flux and positively correlated with CO2 and N2O emission fluxes. Sucrase activity was negatively correlated with CH4 emissions from 0 to 20 cm, and positively correlated with N2O greenhouse gas emissions. The correlation between the sucrase activity of the layer 20~40 cm and greenhouse gas emission flux was not significant. In summary, for the purpose of straw returning and reducing the amount of chemical fertilizers, rotary tillage and nitrogen reduction treatment is the optimal combination to maintain high soil enzyme activity while reducing greenhouse gas emissions. |
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