【摘要】 研究了红壤丘陵地区大田条件下旱地种植冬季豆科作物、油料作物、休闲 ,以及水稻田冬季休闲、种植紫云英绿肥后 ,土壤氧化亚氮 (N2 O)的排放。结果表明 ,水稻田冬季种植紫云英 ,N2 O平均排放通量 (以N计 ,以下同 )为11 1μg·m-2 ·h-1,比休闲田 (18 3μg·m-2 ·h-1)降低 39% ;旱地种植豌豆 ,N2 O平均排放通量只有 6 9μg·m-2 ·h-1,显著低于休闲田 (9 6 μg·m-2 ·h-1) ,也显著低于油菜田 (12 2 μg·m-2 ·h-1)。各作物施肥后土壤N2 O的排放量均增加 ,豌豆田N2 O平均排放通量为 10 0 μg·m-2 ·h-1,仍显著低于油菜田 (14 7μg·m-2 ·h-1)。因此 ,冬季种植豆科作物可显著降低稻田以及旱地农田N2 O的排放量更多还原

【Abstract】 Field studies were conducted in red soil hilly region to investigate the effects of winter legume crops,rapeseed crops and fallow in upland agricultural soils,and milk vetch and fallow in paddy field on nitrous oxide(N 2O)emissions.Results from the paddy fields demonstrated that the milk vetch plot emitted 39% lower N 2O than the fallow plot,with the average N 2O flux of 11 1 and 18 3 μg·m -2 ·h -1 respectively.Results from the upland agricultural soils demonstrated that pea treatment emitted much lower N 2O than the fallow plot,with the average N 2O flux of 6 9 and 9 6 μg·m -2 ·h -1 respectively and that the rapeseed treatment being 12 2 μg·m -2 ·h -1 .Results also demonstrated that N fertilized plot emitted much higher flux than the respective unfertilized plot and the fertilized pea plot still emitted obvious lower flux than the fertilized rapeseed plot,the average N 2O flux being 10 0 and 14 7 μg·m -2 ·h -1 respectively.Winter legume crop cultivation could,therefore,reduce N 2O emission from both upland and paddy soils.更多还原