Based on climate data from 254 meteorological stations, this study estimated the effects of climate change on rice planting boundaries and potential yields in the southern China during 1951-2010. The results indicated...Based on climate data from 254 meteorological stations, this study estimated the effects of climate change on rice planting boundaries and potential yields in the southern China during 1951-2010. The results indicated a signiifcant northward shift and westward expansion of northern boundaries for rice planting in the southern China. Compared with the period of 1951-1980, the average temperature during rice growing season in the period of 1981-2010 increased by 0.4＆#176;C, and the northern planting boundaries for single rice cropping system （SRCS）, early triple cropping rice system （ETCRS）, medium triple cropping rice system （MTCRS）, and late triple cropping rice system （LTCRS） moved northward by 10, 30, 52 and 66 km, respectively. In addition, compared with the period of 1951-1980, the suitable planting area for SRCS was reduced by 11%during the period of 1981-2010. However, the suitable planting areas for other rice cropping systems increased, with the increasing amplitude of 3, 8, and 10%for ETCRS, MTCRS and LTCRS, respectively. In general, the light and temperature potential productivity of rice decreased by 2.5%. Without considering the change of rice cultivars, the northern planting boundaries for different rice cropping systems showed a northward shift tendency. Climate change resulted in decrease of per unit area yield for SRCS and the annual average yields of ETCRS and LTCRS. Nevertheless, the overall rice production in the entire research area showed a decreasing trend even with the increasing trend of annual average yield for MTCRS.展开更多
采用静态箱-气相色谱法在江汉平原开展了稻虾种养模式和中稻单作下稻田CH_(4)和N_(2)O排放的对比监测试验,重点探究了稻虾种养模式下稻田温室气体排放强度特征及田间表层水深和气温对稻虾种养田温室气体排放的影响,为江汉平原稻田温室...采用静态箱-气相色谱法在江汉平原开展了稻虾种养模式和中稻单作下稻田CH_(4)和N_(2)O排放的对比监测试验,重点探究了稻虾种养模式下稻田温室气体排放强度特征及田间表层水深和气温对稻虾种养田温室气体排放的影响,为江汉平原稻田温室气体排放核算评估和减排技术制定提供参考依据。结果表明,与常规中稻田相比,稻虾种养田CH_(4)排放总量显著增加369.3%(P<0.05),N_(2)O排放总量显著降低33.3%(P<0.05),N_(2)O与CH_(4)排放呈此消彼长的关系;增温潜势的主要贡献来源为CH_(4)排放,稻虾种养模式田温室气体排放强度比常规中稻田显著增加1.06 kg CO_(2)-e/kg(P<0.05);稻虾种养田CH_(4)的排放通量与田间表层水深和温度呈显著正相关(P<0.05),常规中稻田非淹水期N_(2)O排放与箱内温度呈显著正相关(P<0.05)。稻虾种养田温室气体的高排放主要由持续淹水厌氧状态导致,探究该模式CH_(4)减排举措最为关键;中稻由于水旱轮作,稻田温室气体排放较低,可作为低碳减排的主要稻作类型。展开更多
基金supported by the National Basic Research Program of China(2010CB951502)the Special Fund for Meteorology-Scientific Research in the Public Interest,China(GYHY201106020)
文摘Based on climate data from 254 meteorological stations, this study estimated the effects of climate change on rice planting boundaries and potential yields in the southern China during 1951-2010. The results indicated a signiifcant northward shift and westward expansion of northern boundaries for rice planting in the southern China. Compared with the period of 1951-1980, the average temperature during rice growing season in the period of 1981-2010 increased by 0.4＆#176;C, and the northern planting boundaries for single rice cropping system （SRCS）, early triple cropping rice system （ETCRS）, medium triple cropping rice system （MTCRS）, and late triple cropping rice system （LTCRS） moved northward by 10, 30, 52 and 66 km, respectively. In addition, compared with the period of 1951-1980, the suitable planting area for SRCS was reduced by 11%during the period of 1981-2010. However, the suitable planting areas for other rice cropping systems increased, with the increasing amplitude of 3, 8, and 10%for ETCRS, MTCRS and LTCRS, respectively. In general, the light and temperature potential productivity of rice decreased by 2.5%. Without considering the change of rice cultivars, the northern planting boundaries for different rice cropping systems showed a northward shift tendency. Climate change resulted in decrease of per unit area yield for SRCS and the annual average yields of ETCRS and LTCRS. Nevertheless, the overall rice production in the entire research area showed a decreasing trend even with the increasing trend of annual average yield for MTCRS.
文摘采用静态箱-气相色谱法在江汉平原开展了稻虾种养模式和中稻单作下稻田CH_(4)和N_(2)O排放的对比监测试验,重点探究了稻虾种养模式下稻田温室气体排放强度特征及田间表层水深和气温对稻虾种养田温室气体排放的影响,为江汉平原稻田温室气体排放核算评估和减排技术制定提供参考依据。结果表明,与常规中稻田相比,稻虾种养田CH_(4)排放总量显著增加369.3%(P<0.05),N_(2)O排放总量显著降低33.3%(P<0.05),N_(2)O与CH_(4)排放呈此消彼长的关系;增温潜势的主要贡献来源为CH_(4)排放,稻虾种养模式田温室气体排放强度比常规中稻田显著增加1.06 kg CO_(2)-e/kg(P<0.05);稻虾种养田CH_(4)的排放通量与田间表层水深和温度呈显著正相关(P<0.05),常规中稻田非淹水期N_(2)O排放与箱内温度呈显著正相关(P<0.05)。稻虾种养田温室气体的高排放主要由持续淹水厌氧状态导致,探究该模式CH_(4)减排举措最为关键;中稻由于水旱轮作,稻田温室气体排放较低,可作为低碳减排的主要稻作类型。
