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| Effects of herbicides on urea nitrogen transformation and greenhouse gas emission from tea garden soil |
| Received:November 08, 2016 |
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| KeyWord:herbicides;tea garden soil;urea;nitrogen transformation;greenhouse gas |
| Author Name | Affiliation | E-mail | | WANG Feng | Tea Research Institute, Fujian Academy of Agricultural Sciences, Fu'an 355015, China
Fujian Province Key Laboratory of Agro-Ecological Processes in Hilly Red Soil, Fuzhou 350013, China | | | CHEN Yu-zhen | Tea Research Institute, Fujian Academy of Agricultural Sciences, Fu'an 355015, China
Fujian Province Key Laboratory of Agro-Ecological Processes in Hilly Red Soil, Fuzhou 350013, China | | | WU Zhi-dan | Tea Research Institute, Fujian Academy of Agricultural Sciences, Fu'an 355015, China
Fujian Province Key Laboratory of Agro-Ecological Processes in Hilly Red Soil, Fuzhou 350013, China | | | JIANG Fu-ying | Tea Research Institute, Fujian Academy of Agricultural Sciences, Fu'an 355015, China
Fujian Province Key Laboratory of Agro-Ecological Processes in Hilly Red Soil, Fuzhou 350013, China | | | WENG Bo-qi | Fujian Province Key Laboratory of Agro-Ecological Processes in Hilly Red Soil, Fuzhou 350013, China | | | YOU Zhi-ming | Tea Research Institute, Fujian Academy of Agricultural Sciences, Fu'an 355015, China
Fujian Province Key Laboratory of Agro-Ecological Processes in Hilly Red Soil, Fuzhou 350013, China | 847842412@qq.com |
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| Abstract: |
| To assess the effects of herbicides on nitrogen transformation and greenhouse gas emission from tea garden soil, an incubation experiment was conducted under laboratory conditions with six treatments including a control(no urea or herbicide), urea, urea+glyphosate potassium salt, urea+glyphosate isopropylamine, urea+glufosinate, and urea+paraquat; 200 mg N·kg-1 dry soil and 10 mg active ingredient· kg-1 dry soil were applied in the urea and herbicide treatments, respectively. The experimental results showed that the four herbicides had a significant suppressive effect on urea hydrolysis during an early stage of incubation(5 d), but had a promotive effect at a later stage of incubation and retarded the hydrolysis time of urea. Paraquat had the most significant effect on urea hydrolysis, and no significant difference was seen with the other herbicide treatments. However, a significant negative effect on soil nitrification was observed for the four herbicide treatments(P<0.05), with nitrification inhibition rates of 38.42%~58.08%, and glyphosate potassium salt had the highest inhibitory effect among the four herbicides(P<0.05). Nitrogen fertilizer greatly increased CO2 and N2O emissions from the tea garden soil, but had no significant effect on CH4 emissions. Compared with urea, the four herbicides increased CO2 emissions(6.05%~65.46%), especially for the glyphosate isopropylamine and paraquat treatments. However, the N2O emission was significantly reduced by 46.21%~63.58% in the four herbicides treatments(P<0.05), especially for the paraquat treatment. The CH4 emission was slightly reduced by herbicide amendments to varying degrees, and the glyphosate isopropylamine and paraquat treatments showed a stronger influence on CH4 emissions than the other treatments, with no significant difference in CH4 emissions among herbicide treatments. Due to the complexity of the effects of different herbicides on microbial physiological metabolism, long-term in situ studies need to be carried out to better understand the effects of various herbicides on nitrogen transformation and greenhouse gas emission. |
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