And the number of charophyta and rhodophyta is less , rich in wulongquan , and none or less in other sites . from the sampling sites distribution of macroalgae in niangziguan , macroalgae species is the most in wulongquan , 30 species , accounting for 48 % of the total . the next is gunquan , 27 species , accounting for 44 % , the third is shuiliandong , 23 species , accounting for 37 % , and pingyanghu 21 species , accounting for 34 % , the last is shuishangrenjia , 17 species , only accounting for 27 % 从娘子关泉域大型藻类植物在各采集点的分布看，五龙泉大型藻类种数最多，为30种，占总种数的48 ，其次是滚泉为27种，占总种数的44 ，第三是水帘洞泉，为23种，占总种数的37 ，第四是平阳湖，种数为21种，占总种数的34 ，水上人家泉的种数最少，为17种，仅占种数27 。
This process is as follows : firstly , the data of different section contour and of section line have been obtained by reverse - engineering ; secondly , non - uniform b - spline approximation algorithm is used to fit the discrete data ; then the data have been optimized and reduced by adopting adaptive sampling of key points of the fitted curve based on vertical distance , sequently the adaptive sampling data is transformed into the format of the . ibl file of the famous 3 - d design software pro / e . therefore we reconstruct the surface and a model is generated ; lastly , the effectiveness of the adopted algorithm and modeling approach are demonstrated by the experiments 建模型的过程中，首先运用逆向工程测量方法，获得曲面物体上不同截面轮廓线的测量数据点列，接着对测量数据点进行平滑处理，用最小二乘法求解基于数据点列的控制多边形，以非均匀三次b样条曲线拟合截面轮廓曲线；然后利用基于垂距的数据采样算法，对拟合曲线上的数据点进行重新采样，达到优化数据点的分布及减少描述曲线数据量的目的。
374 - nt sequence analysis between nt 47 - 420 and restriction enzyme ( re ) clevage site mapping of f gene between nt 34 - 1682 were used to compare the 18 isolates for genetic analysis . a phylogenic tree was constructed based on the 374 - nt - sequence data of eighteen isolates in the study and 37 ndv reference strains from genbank and published resources 通过dnastar软件对f基因47 470nt间片段进行同源性分析比较并绘制了遗传进化树枝状结构发生图，结合334 1672nt间三种限制性内切酶( re ： hinf ， bsto及rsa )位点的分布情况，确定了这些分离株的基因分类地位。
