| Effect of nitrogen application rate on ammonia volatilization and nitrous oxide emission in Korla fragrant pear orchard |
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| DOI：10.7606/j.issn.1000-7601.2019.05.23 |
| Key Words: ammonia volatilization nitrous oxide emission nitrogen fertilizer korla fragrant pear |
| Author Name | Affiliation | | WANG Cheng | College of Pratacultural and Environmental Science, Xinjiang Agriculture University, Urumqi, Xinjiang 830052, China | | CHEN Bo-lang | College of Pratacultural and Environmental Science, Xinjiang Agriculture University, Urumqi, Xinjiang 830052, China
Xinjiang Key Laboratory of Soil and Plant Ecological Process, Urumqi, Xinjiang 830052, China | | Yusufujiang·Yusuyin | College of Pratacultural and Environmental Science, Xinjiang Agriculture University, Urumqi, Xinjiang 830052, China
Xinjiang Key Laboratory of Soil and Plant Ecological Process, Urumqi, Xinjiang 830052, China | | WANG Qian-deng | College of Pratacultural and Environmental Science, Xinjiang Agriculture University, Urumqi, Xinjiang 830052, China | | CHAI Zhong-ping | College of Pratacultural and Environmental Science, Xinjiang Agriculture University, Urumqi, Xinjiang 830052, China
Xinjiang Key Laboratory of Soil and Plant Ecological Process, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| To understand the nitrogen (N) loss of soil N in the Korla fragrant pear orchard, in this study, the methods of closed gas gathering and the static box-gas chromatography were used to study the soil ammonia volatilization and nitrous oxide emission under different N fertilizer rates. Five treatments were set including no fertilization (N0P0K0), no N application (N0PK), N application 150 kg·hm-2 (N1PK), N application 300 kg·hm-2 (N2PK), N application 450 kg·hm-2 (N3PK). The results showed that both ammonia volatilization rate and nitrous oxide emission flux peaked on the 4th day after application of base fertilizer and top dressing, the ammonia volatilization rate and nitrous oxide emission flux increased with increasing the N application rate. The cumulative amount of ammonia volatilization among the different treatments reached 27.886~44.416 kg·hm-2·a-1, the net loss of ammonia volatilization with N application treatments reached 6.726~16.197 kg·hm-2·a-1, the cumulative amount of nitrous oxide among the different treatments reached 341.616~531.960 g·hm-2·a-1, the net loss of nitrous oxide with N application treatments reached 90.452~185.412 g·hm-2·a-1, the accumulation of ammonia volatilization and the net loss, the cumulative amount of nitrous oxide and the net loss all increased with increasing the nitrogen application rate, the net loss rate of ammonia volatilization with nitrogen application treatments was 2.720%~4.480%, the net loss rate of nitrous oxide was 0.038%~0.060%, the net loss rate of ammonia volatilization and nitrous oxide both showed a tendency to decrease first and increase later with increasing the amount of N applied. Application of N fertilizer could significantly increase the content of ammonium N and nitrate N in 0~20 cm and 20~40 cm soil layers. Correlation analysis showed that ammonia volatilization rate and nitrous oxide emission flux were significantly positively correlated with N application rate and soil temperature. The yield of Korla fragrant pear treated with N2PK reached 6 213.5 kg·hm-2, which was the highest. But, the net loss rate of ammonia volatilization and nitrous oxide were the smallest, which were 2.720% and 0.038%, respectively. From the perspective of N loss in the soil and production in Korla fragrant pear orchard, the optimum amount of pure N was 300 kg·hm-2. |
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