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| Comparison of N2O and NO Emissions from Ridged and Furrowed Soils in a Greenhouse in Northern China |
| Received:May 15, 2014 |
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| KeyWord:greenhouse vegetable cropping system;trace gases;N2O emission;NO emission |
| Author Name | Affiliation | E-mail | | SONG He | College of Agronomy, Anhui Agricultural University, Hefei 230036, China | | | PAN Guang-yuan | College of Agronomy, Anhui Agricultural University, Hefei 230036, China | | | CHEN Qing | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | CAO Wen-chao | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | WANG Jing-guo | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | wangjgcau@163.com |
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| Abstract: |
| In greenhouse vegetable cropping systems, elevated N fertilizer inputs may increase N2O and NO emissions from soils. Here N2O and NO emissions from ridged and furrowed soils in a greenhouse were monitored to obtain accurate estimates of annual emissions of trace gases from Chinese greenhouse soils. The results showed that N2O and NO emissions were significantly different between ridged and furrowed soils. Annual N2O emissions were 11.60 and 4.23 kg N·hm-2 and annual NO emissions 1.27 and 0.43 kg N·hm-2, from furrowed and ridged soils, respectively. Taking the ratio of furrow to ridge area(3:1) into account, corrected annual emissions of N2O and NO were 9.65和1.06 kg N·hm-2, respectively. If sampled in furrowed soils, the annual emissions of soil N2O and NO would be overestimated at 1.95 kg N·hm-2 and 0.21 NO kg N·hm-2. The CO2 emissions from ridged soils were far lower than from furrowed soils, implying that C resource might be the factor limiting denitrification. Therefore, manure should be applied away from the ridge to prevent N losses. In addition, ridge soils as a sink of inorganic N should not be ignored when estimating N budgets and nitrate leaching in greenhouse vegetable cropping systems. |
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