3.8 外来入侵生物的防治讲义精品.pptVIP

秦启连博士报告，2006 秦启连博士报告，2006 /imgres?imgurl=/biodiversity/herbarium/invasive_species/corvar_aspect01_web.jpgimgrefurl=/biodiversity/herbarium/invasive_species/corvar01.htmh=400w=533sz=55tbnid=a-V7gX-o8jqe9M:tbnh=96tbnw=129hl=zh-CNstart=30prev=/images%3Fq%3DCoronilla%2Bvaria%26start%3D20%26svnum%3D10%26hl%3Dzh-CN%26lr%3Dlang_zh-CN%26newwindow%3D1%26sa%3DN： Crown vetch is an herbaceous perennial that spreads aggressively by the growth of rhizomes and also reproduces readily from seed. It can form dense, nearly monotypic stands on sunny sites and crowds out most of the other vegetation. It has been widely planted to stabilize soil, especially after road construction, and it persist for many years afterward and spreads into adjacent natural habitats.An additional problem arises from its use on sandy soils of low productivity. Such soils provide habitat, refuge of a sort, for native plants that cant compete with the robust agricultural plants that thrive on productive soils. Crown vetch is a legume and in league with bacteria it can fix nitrogen from the atmosphere into a chemical form that plants can use. That nitrogen is ultimately added to the soil and effectively fertilizes the site, thereby encouraging the growth of weeds, and the habitat is lost to native species even if the crown-vetch is later removed. 学名：Ambrosia artemisiifolia Linn.英文名：Ragweed科名：菊科 Compositae? ??? 一年生草本，高30—150厘米，元毛或有柔毛。叶片2—3回羽状分裂，两面有细短毛或表面无毛。雄性头状花序黄绿色，直径2．5—5毫米，有细短梗，再排成总状；总苞浅碟状，边缘有数浅圆齿，有长柔毛或无毛；雌花总苞顶端有4—7细尖齿，结果时残存瘦果上部。花果期7—9月。? ??? 原产北美。现为南京及上海等地常见杂草。 学名：Ambrosia artemisiifolia Linn.英文名：Ragweed科名：菊科 Compositae? ??? 一年生草本，高30—150厘米，元毛或有柔毛。叶片2—3回羽状分裂，两面有细短毛或表面无毛。雄性头状花序黄绿色，直径2．5—5毫米，有细短梗，再排成总状；总苞浅碟状，边缘有数浅圆齿，有长柔毛或无毛；雌花总苞顶端有4—7细尖齿，结果时残存瘦果上部。花果期7—9月。? ??? 原产北美。现为南京及上海等地常见杂草。 Leather S R. Insect-induced chemical changes in young lodgpole pine(Pinus contorta): the effect of previous defoliation on oviposition, growth and survival of the pine beauty moth，Panolis flammea . Ecol Entomol, 1987, 12: 275-