title: [Effect of Stimulated N Deposition on N₂O Emission from a Stipa krylovii Steppe in Inner Mongolia, China].
abstract: With fast development of industry, agriculture and society, very high N deposition occurs in China. N deposition has exceeded 3 g · (m² · a)⁻¹ in some areas of temperate steppes, which is a significant part of the Eurasia grassland, but may possibly be sensitive to N deposition. To study the effect of N deposition on N cycling in typical temperate steppe, N₂O emissions were measured in a Stipa krylovii steppe in Inner Mongolia for a whole year. A field control experiment of simulated N deposition (by NaNO₃ addition) was also carried out at 6 dose levels, CK (control), N2 [2 g · (m² · a)⁻¹], N5 [5 g · (m² · a)⁻¹], N10 [10 g · (m² · a)⁻¹], N25 [25 g · (m² · a)⁻¹], and N50 [50 g · (m² · a)⁻¹]. The results showed that the natural N₂O-N emission flux was 0.10 g · (m² · a)⁻¹, accounting for about 3% of the total N deposition, and much depended on soil water content and soil temperature under ambient N deposition. In addition, enhanced N deposition might significantly increase N₂O emission, especially at very high N doses (N25 and N50 treatments). The annual N2 0 emission flux showed a linear relationship with the N addition. Greater attention should therefore be paid to the relatively high N₂O emission in the typical temperate steppe in China.
authors: Han-yue
authors: HY
authors: Yang
authors: Ting
authors: T
authors: Zhang
authors: Yong-mei
authors: YM
authors: Huang
authors: Lei
authors: L
authors: Duan
mesh_terms: D000383:Agriculture; D002681:China; D004784:Environmental Monitoring; D065948:Grassland; D009584:Nitrogen / Q000032:analysis*; D058458:Nitrogen Cycle; D009609:Nitrous Oxide / Q000032:analysis*; D006109:Poaceae; D012987:Soil / Q000737:chemistry*; D013696:Temperature; D014867:Water
chemical_list: D012987:Soil; D014867:Water; D009609:Nitrous Oxide; D009584:Nitrogen