为探究农户和龙头企业之间的共生行为模式,以及不同共生行为模式的动态演化机制,本文借鉴生态位理论和共生理论,构建农户和龙头企业Logistic模型,探究农户和龙头企业间不同的共生行为模式,应用了相平面法对不同共生模式动态演化过程进行了细致分析。研究结果表明：(1)农户和龙头企业间存在六种共生行为模式,最主要的模式分别是寄生共生、竞争共生、独立共生和互惠共生。(2)偏害共生和偏利共生是农户和龙头企业由竞争共生向独立共生,独立共生向互惠共生演化中伴随出现的模式。(3)生态位重叠度和阻滞系数的大小决定了演化的方向,生态位重叠度大于阻滞系数,双方向互惠共生演化,反之则向寄生共生演化。

To explore symbiotic behavioral patterns of farmer and dominant enterprise, as well as the dynamic evolution mechanism of different symbiotic behavior patterns, this paper uses the ecological theory and the symbiosis theory, build Logistic model to explore the different symbiosis behavior modes between farmer and dominant enterprise. And also uses the phase plane method to analyze the dynamic evolution process of different symbiotic models. The results of research are as following: First, there are six symbiosis behavior modes between farmer and dominant enterprise. But the dominant modes are parasitic symbiosis, competitive symbiosis, independent symbiosis and reciprocal symbiosis respectively. Second, amensalism symbiosis and commensalism symbiosis are the transition modes when farmer and dominant enterprise from competitive symbiosis to independent symbiosis or from independent symbiosis to amensalism symbiosis. Third, the niche overlap and block coefficient determines the direction of evolution. When niche overlap is greater than the block coefficient, both sides will evolve into amensalism symbiosis. Conversely, both sides will evolve into parasitic symbiosis.

浙江省哲学社科规划一般项目“基于生态位视角的农产品质量安全保障模式与机制研究——以浙江省为例”（13NDJC035YB)、浙江省高校重大人文社科攻关计划青年重点项目“基于龙头企业与农户互惠共生关系的农产品质量安全保障机制研究——生态位理论分析视角”（2013QN081）