The exploration of cross test between Ulva pertusa Kjellm.filtrates and the two species of micro-algae filtrates

The filtrates of Ulva pertusa Kjellm.,Platymonas helgolandica Kylin var.tsingtaoensis and Alexandrium tamarense(Lebour) Balech were researched using cross test under lab conditions and the preliminary studies on mechanism of competitive growth of interspecis between marine macro-algae and micro-algae.The results demonstrated that the filtrates of the two species of micro-algae dealt with different temperatures have notable effects on the growth of U.pertusa Kjellm.,and the filtrates of U.pertusa Kjellm dealt with different temperatures showed significant effects on the growth of P.helgolandica Kylin var.tsingtaoensis,but showed unnoticed effects on the growth of A.tamarense(Lebour) Balech.Therefore,that U.pertusa Kjellm.inhibits P.helgolandica Kglin var.tsingtaoensis from growing was finished by cell's contaction,while that U.pertusa Kjellm.inhibits P.helgolandica Kylin var tsingtaoensis from growing and that the two species of micro-algae inhibit U.pertusa Kjellm.from growing were realized by ECP.and the other ways and functions of interaction between macro-algae and micro-algae need being studied further.