绿萍在稻鸭共作系统中的消长动态及增产效应

本文系统分析了稻鸭萍共作系统的生态结构，绿萍在系统中的生长动态和增产效应。结果表明，通过鸭子和绿萍在稻田生态位的添加，使原来的稻田食物链结构趋向复杂化，增加了稻田生态系统的稳定性，有效促进了水稻产量性状的表达和稻米品质的改善。稻鸭萍处理由于鸭子的作用，利于绿萍的分萍、倒萍，促其生长，绿萍生长后期倒萍速度明显低于稻萍处理。随着鸭子的不断成长，对萍的采食量也不断增加，整个共作期间每只鸭可食鲜萍量40.8kg。总之，稻鸭萍共作系统是一项种养相结合，节本增效的生态工程技术。

Increasing yield and population dynamics of azolla in rice-duck-azolla integrated farming

The article studied increasing yield and population dynamics of azolla in rice-duck-azolla integrated farming. The results showed that it improves rice yield and rice quality, because of food chain complexity and system stability in rice-duck-azolla integrated farming. Ducks’ activity make for azolla growth, and decreasing speed of azolla is lower than rice-azolla treatment. The amount of ducks eating azolla is 40.8kg in total integrated period. In a word, rice-duck-azolla integrated farming is a safe and high efficiently ecological approach.