| Effect of organic materials on N2O emission under different N-fertilizer levels in dryland of the Loess Plateau of central Gansu Province |
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| DOI：10.7606/j.issn.1000-7601.2019.01.15 |
| Key Words: dry farmland N2O emission biochar straw returning N fertilizer level |
| Author Name | Affiliation | | WANG Yong-bin | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Laboratory of Arid Land Crop Science, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | WU Jun | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Laboratory of Arid Land Crop Science, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | L Jin-hui | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Laboratory of Arid Land Crop Science, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CAI Li-qun | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Laboratory of Arid Land Crop Science, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Engineering Research Center for Agriculture Water-saving, Lanzhou, Gansu 730070, China | | ZHANG Jun | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Laboratory of Arid Land Crop Science, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Engineering Research Center for Agriculture Water-saving, Lanzhou, Gansu 730070, China | | ZHANG Ren-zhi | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Laboratory of Arid Land Crop Science, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Engineering Research Center for Agriculture Water-saving, Lanzhou, Gansu 730070, China |
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| Abstract: |
| In order to explore the effect of application of biochar and straw on N2O emission under different N-fertilizer levels in dryland of the Loess Plateau in central Gansu Province, a field trail with different organic materials combining with different N-fertilizer levels was studied for 4 years. Experiment included the following treatments: the straw combined with three N fertilizer rates (0, 50, and 100 kg·hm-2), coded as SN0, SN50, and SN100, respectively; The biochar applied alone or combined with N fertilizer (50 and 100 kg·hm-2), coded as BN0, BN50, and BN100, respectively; N fertilizer (0, 50 and 100 kg·hm-2) alone coded as CN0, CN50, and CN100, respectively. Collection of N2O flux was conducted with a static chamber-gas chromatography method from November 2016 to October 2017. The results showed that the average N2O flux from all treatments ranked as SN100>CN100>SN50>CN50>BN100>SNO>BN50>CN0>BN0, and N2O fluxes represented the generally same trend throughout the observed period under different treatments. Compared with N0 (CN0, SN0, BN0) treated plots, N50 (CN50, SN50, BN50) and N100 (CN100, SN100, BN100) treatments increased the annual average N2O fluxes by 6.92% and 10.03%, respectively. Compared with CN0, CN50, and CN100, the same N-fertilizer level combined with the biochar reduced the annual average N2O fluxes by 0.49%, 3.15%, and 4.67%, respectively. In comparison with CN0, CN50, and CN100 treatments, the same N-fertilizer level combined with the straw increased the annual average N2O fluxes by 6.37%, 3.44%, and 2.73%, respectively. Both N fertilizer applied alone treatments and straw combined with N fertilizer treatments boosted N2O fluxes, biochar combined with N fertilizer treatments reduced N2O fluxes. Both N-fertilizer and straw significantly promoted the effect of the GWP of N2O fluxes, the biochar, however, had a reducing effect. The correlation analysis indicated that soil temperature and N2O flux had a significant positive correlation but the soil water content and N2O flux had a significant negative correlation (P<5%). The path analysis showed that the impact of soil temperature on N2O flux was greater than soil water content. Interaction analysis exhibited that no interaction effect between straw and N, biochar and N. N2O flux increased with increasing N application levels. Straw application enhanced N2O emission but biochar repressed N2O emission. Therefore, the biochar use had a great effect on the reduction of N2O emission in dryland. |
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