摘要
研究了大田条件下施用绿肥与化肥N后 ,双季稻区稻田土壤氧化亚氮 (N2 O)的排放。结果表明 ,在早稻生长季节既施绿肥又施化肥的处理 (VN)N2 O N的排放量高达 2 75kghm- 2 ,显著高于只施绿肥不施化肥 (V0 )、只施化肥不施绿肥 (FN)或既不施绿肥也不施化肥 (F0 )的处理 (后三者在早稻生长季节N2 O N的排放量分别为 0 2 9kghm- 2 、0 3 5kghm- 2 和 0 1 8kghm- 2 ) ,也显著高于在晚稻生长季节各处理N2 O N的排放量 (VN、V0、FN和F0处理分别为 0 3 4、0 2 6、0 2 8和 0 2 3kghm- 2 )。绿肥不仅影响稻田土壤N2 O的排放量 ,还影响其排放模式。VN处理N2 O的排放主要集中早稻生长季节的中期烤田之后 ,其它处理则在整个水稻生长季节均有排放。在早稻生长季节绿肥与化肥N间还存在极显著的交互效应。
A field study was conducted to investigate effects of leguminous green manure and chemical fertilizer N on nitrous oxide (N 2O) emissions from paddy soils under double-crop rice systems. Results demonstrated that during the early rice growing season, the treatment that received both green manure and synthesized N fertilizer emitted significantly more N 2O than the other three treatments did, which received only green manure (V0), only synthesized N fertilizer (FN), or neither green manure nor chemical N fertilizer (F0), separately. The seasonal accumulative N 2O-N emission was 2.75 kg hm -2 with the former, and 0.29 kg hm -2, 0.35 kg hm -2 and 0.18 kg hm -2, respectively with the other three. During the late rice growing season, 0.34, 0.26, 0.28 and 0.23 kg hm -2 was emitted from those four treatments respectively, all much lower than that from Treatment VN during the early rice growing season. Besides its effect on N 2O emission rate, the incorporation of green manure also affected N 2O emission time pattern. In Treatment VN, N 2O evolution was concentrated mainly after the mid-summer drainage during the early rice growing season, while in the other three treatment the N 2O emission was distributed evenly throughout the entire rice growing season. The results also indicated that there existed great interaction between green manure and chemical N fertilizer during the early rice growing season.
出处
《土壤学报》
CAS
CSCD
北大核心
2003年第5期704-710,共7页
Acta Pedologica Sinica
基金
国家自然科学重大项目基金 ( 3 9790 1 0 0 )资助
