关键词: 蔬菜, 蔬菜, 贸易, 影响因素, 引力模型

Abstract:

In order to explore the using of Procambius clarkii as a way of biological control Pomacea canaliculata (Lamarck), We studied Procambius clarkii prey on different height of eggs apart from water surface laid by P. canaliculata in laboratory, and we used a novel experimental design and analysis method named UD-SVR (uniform design and support vector regression) to study which factor affected the height of eggs laid by P. canaliculata. Result indicated, height of eggs apart from water surface seriously restricted Procambius clarkii to prey the snail’s eggs, and when the height apart from water surface was higher, the predation rate was lower. In the four factors, such as size of the snails, distance apart from the water surface, temperature at night, humidity at night, only the factor of distance apart from the water surface has significant effect on the spawning height of snails, this distance was proportional to the height of eggs laid by snail, as a result it made difficult for Procambius clarkii to prey eggs. Therefore, in paddy field, irrigation canals and pond, it would be best to reduce water level in peak period of spawning and raise water level after it spawning, this measures is beneficial for preying eggs by Procambius clarkii.