| 1 | 湖北地区稻田甲烷排放量及控制措施的研究显示文摘通过田间试验 ,比较研究了施用有机肥 ,硫铵 ,包膜复合肥 ,尿素 +淹灌 ,尿素 +间歇落干5种处理对早、晚稻甲烷排放量的影响。测得5种处理的早、晚稻甲烷平均排放通量为:早稻4.39~15.6mg/m2·h ,平均值8.03mg/m2·h ;晚稻5.65~22.0mg/m2·h,平均值10.7mg/m2·h。从各种措施的效果来看 ,5种处理间存在显著差异 ,其中以施包膜复合肥处理效果最佳 ,与施有机肥比较 ,年甲烷排放总量减少73.4 %。包膜复合肥处理比施尿素处理年甲烷排放总量减少48.6 %。 | 林匡飞 项雅玲 姜达炳 胡球兰 李志红 杜道灯 陶战 | 2000 | 农业环境保护2000，19，5： | 34 |
| 2 | Response of CH_4 emission of paddy fields to land management practices at a microcosmic cultivation scale in China显示文摘The terrestrial ecosystem may be either a source or a sink of CH4 in rice paddies, depending, to a great extent, on the change of ecosystem types and land use patterns. CH4 emission fluxes from paddy fields under 4 cultivation patterns (conventional plain culture of rice(T1), no-tillage and ridge culture of rice(T2), no-tillage and ridge culture of rice and wheat (T3), and rice-wheat rotation(T4)) were measured with the closed chamber technique in 1996 and 1998 in Chongqing, China. The results showed that differences existed in CH4 emission from paddy fields under these land management practices. In 1996 and 1998, CH4 emission was 71 48% and 78 82%(T2), 65 93% and 57 18%(T3), and 61 53% and 34 22%(T4) of that in T1 during the rice growing season. During the non-rice growing season, CH4 emission from rice fields was 76 23% in T2 and 38 69% in T1 The accumulated annual CH4 emission in T2, T3 and T4 in 1996 decreased by 33 53%, 63 30% and 65 73%, respectively, as compared with that in T1 In 1998, the accumulated annual CH4 emission in T1, T2, T3 and T4 was 116 96 g/m2, 68 44 g/m2, 19 70 g/m2 and 11 80 g/m2, respectively. Changes in soil physical and chemical properties, in thermal and moisture conditions in the soil and in rice plant growth induced by different land use patterns were the dominant causes for the difference in CH4 emission observed. The relative contribution of various influencing factors to CH4 emission from paddy fields differed significantly under different land use patterns. However, the general trend was that chlorophyll content in rice leaves, air temperature and temperature at the 5 cm soil layer play a major role in CH4 emission from paddy fields and the effects of illumination, relative humidity and water layer depth in the paddy field and CH4 concentration in the crop canopy were relatively non-significant. Such conservative land use patterns as no-tillage and ridge culture of rice with or without rotation with wheat are thought to be beneficial to reducing CH4 emission from paddy fields and are, therefore, recommended as a significant solution to the problems of global(climatic) change. | SHAOJiang-an HUANGXue-xia GAOMing WEIChao-fu XIEDe-ti CAIZu-cong | 2005 | Journal of Environmental Sciences2005，17，4： | 10 |
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