Abstract: The effects of different sowing dates[regular sowing date: June 15 (CK);early sowing date:May 20 (M1);postponed sowing date:July 10 (M2)]and different rice varieties on utilization efficiencies of light,temperature and water under rice-shrimp system were studied,so as to provide a theoretical basis for efficient use of resource of rice-shrimp system.The results showed that the rice yield decreased gradually with the delay of sowing date,which was 7.4—13.0 t/ha,and there were significant differences among the three sowing dates and the different rice varieties; production efficiencies of light energy and temperature decreased with the delay of sowing date;economic benefit increased with the delay of sowing date.Compared with M2 treatment,M1 treatment increased the production efficiencies of light energy and temperature,water use efficiency by 26.7%,18.2% and 18.8%,respectively.The economic benefit of M2 treatment was the highest,which increased by 41.5% and 10.7% compared with M1 treatment and CK,respectively. Yongyou 4949,Shengtaiyou 018 and Zhongjiazao 17 all had higher yields,production efficiencies of temperature and light energy,water use efficiencies and economic benefits than the other rice varieties under the same sowing date.To sum up,M2 treatment with rice varieties of short growth period had the lowest utilization efficiencies of light,temperature and water,but the highest economic benefit,indicating that the rice-shrimp system could appropriately delay the shrimp harvesting time to early July,at the same time,rice varieties with higher yield and more efficient utilization of resources should be selected under the premise of ensuring economic benefit.

Key words: Rice-shrimp system, Resource utilization efficiency, Economic benefit, Sowing date, Variety

摘要： 研究不同播期［常规播期:6月15日（CK）;提前播期:5月20日（M1）;推迟播期:7月10日（M2）］和不同水稻品种对稻-虾模式光温水资源利用效率的影响，为建立资源高效利用的稻-虾模式提供理论依据。结果表明，随播期的推迟，水稻产量呈逐渐下降趋势，介于7.4~13.0 t/hm²，3个播期处理间差异显著，总体上品种间差异也显著；光能生产效率、温度生产效率也呈降低趋势；而经济效益呈增长趋势。与M2处理相比，M1处理的光能生产效率、温度生产效率、水分利用率分别提高26.7%、18.2%、18.8%。在经济效益上，M2处理最高，较M1、CK分别提高41.5%、10.7%。甬优4949、盛泰优018和中嘉早17的稻谷产量、温度生产效率、光能生产效率、水分利用率、经济效益均高于同播期下其他水稻品种。综上，推迟播期的稻-虾模式所搭配的短生育期水稻品种光、温、水资源利用效率最低，但经济效益最高， 可见稻-虾模式可以适当延长收虾时间至7月初，同时在保证经济效益的前提下，宜选育更高产且资源利用效率更高的水稻品种。

关键词: 稻-虾模式, 资源利用效率, 经济效益, 播期, 品种