Objective to test both normal adult fenrrets and mature ferretswhose pinna and concha had been removed bilaterally in infancy for their ability to localize sound relatively in the horizontal plane 目的研究正常雪貂和自幼切除耳廓和部分外耳道的雪貂对水平方向声音的相对定位能力，研究耳廓外耳道对它的影响。
As concentration in root was not affected markedly by ca levels , while that of petiole increased and that of pinna decreased significantly . adding as was benefit to take up ca by p . vittata l . in the roots and pinnae 提高溶液中钙浓度，根部砷浓度不受影响，但叶柄中的砷浓度增加，羽叶中砷浓度有明显下降，即钙明显抑制蜈蚣草羽叶中砷的吸收。
Conclusion this result shows that that the pinna and concha have almost no effect no sound localization in horizontal plane , which means spectral characteristic does not possihly dominate in horizorntal plane 结论实验表明耳廓和外耳道对水平方向的声音定位几乎无影响，也就是说在水平方向上的声音定位，耳廓和外耳道的滤波、共振等改变声波频谱特性作用可能不明显。
It is shown that the concentrations of k , mn , fe and cu in the pinnae were not influenced by enhancing the as in addition to fe and zn . when treated with high as level , pteris vittata l . could maintain its normal nutrition metabolism 除fe和zn外，添加砷对蜈蚣草羽叶中各金属元素浓度均无显著影响，表明高砷条件下，蜈蚣草中金属元素营养状况正常，可维持良好的生理活动。
There was no significant relationship between the ca concentration and other metals concentrations in the roots . but the positive correlation between ca and fe concentrations hi petioles was very significantly . the k , mg , mn and zn concentrations in pinnae decreased as the ca concentration increased 在根部中ca与各种金属元素都无显著的相关性；叶柄中ca与fe浓度呈极显著正相关；在羽叶内， ca浓度的增加明显降低k 、 mg 、 mn和zn浓度。
Leaves bipinnate , 10 - 25 cm long , usually with 2 pairs of pinnae , rachis often ending in a tendril ; pinnae with 2 - 4pairs of leaflets and terminal tendrils ; leaflets opposite , oblong or long obovate , 3 - 9cm long , 1 . 5 - 4cm wide , apex obtuse or emarginated , base slightly oblique 叶为二回羽状复叶，长10 - 25厘米，叶轴先端常变为?须，羽片通常2对，顶生1对羽片变为?须；小叶2 - 4对，对生，长椭圆形或长倒卵形，长3 - 9厘米，宽1 . 5 - 4厘米，先端钝、微凹，基部略偏斜。
Leaves crowded near apex of the trunk , spirally arranged ; stipes dark brown , with sharp spines ; lamina large , oblong , tripinnate ; pinnae 17 - 20 pairs , alternate , longest one to 60 cm long , the basal one reduced ; rachis short - spiny ; pinnules 18 - 20 pairs , sessile or nearly so , lanceolate , to 10 cm long and 2 . 5 cm wide , divided almost to the costa ; segments more or less falcate , toothed 叶螺旋状排列，聚生于茎端；叶柄棕色，具锐刺；叶片大，长矩圆形，三回羽状深裂；羽片17 - 20对，互生，最大的长达60厘米，基部一对缩短，羽轴有短刺；小羽片18 - 20对，无柄或近于无柄，披针形，长达10厘米，宽2 . 5厘米，深裂几达中脉；末回裂片多少镰状，有齿。
Leaves tufted ; stipes stout , up to 1 . 2 m long , densely covered with golden brown hairs at base ; lamina up to 2 m long and 1 m wide , tripinnatifid ; pinnae alternate , sparsely spaced ; pinnules linear - lanceolate , to 15 cm long and 1 - 2 . 5 cm wide , short - stipitate ; ultimate lobes linear , more or less falcate , shallowly serrate , dark green and shining above , light green to glaucous below 叶簇生；叶柄粗壮，长可达1 . 2米，基部亦密被金黄褐色毛；叶片长可达2米，宽达1米，三回羽状分裂；羽片互生，疏离；小羽片线状披针形，长达15厘米，宽1 - 2 . 5厘米，具短柄；末回裂片线形，略呈镰状，边缘有浅锯齿，上面深绿色，有光泽，下面灰白色。
Leaves tufted ; stipes 15 - 30 cm long , densely scaly at base , glabrous above ; sterile lamina about 60 cm long and 20 cm wide , simply pinnate ; pinnae numerous , alternate or subopposite , linear - lanceolate , the largest about 12 cm long and 1 cm wide , base cordate , apex acuminate , margin finely toothed ; veins close , forking once or twice and forming areoles near the midrib ; fertile lamina similar to sterile ones , but somewhat reduced , about 8 cm long and 0 . 4 cm wide , lower surface almost entirely covered with sporangia 叶簇生；叶柄长15 - 30厘米，基部密被鳞片，向上近光滑；不育叶片长约60厘米，宽20厘米，一回羽状；羽片多数，互生或近对生，线状披针形，最长者长达12厘米，宽约1厘米，顶端长渐尖，基部心形，边缘有细密锯齿；叶脉1 - 2次分叉，近中脉形成网眼；能育叶与不育叶相似，但较小，长约8厘米，宽约0 . 4厘米，下部满布孢子囊。
