Then, use a simple system of symbols to mark off 4 different information types in the column space left in the margin.
然后，在你的第一列空栏中使用不同4符号为4不同的信息类型做标记。
On the base of DCA use the method of DCCA to mark off system group and reflect the relationship between environmental factors and vegetation.
然后在DCA排序分析的基础上采用DCCA排序分析来反映环境因子和植被之间的关系来划分系统组。
Analysis system groups and remote sensing images and vector images use the method of superimposition analysis, combine with fieldwork files to mark off system series.
系统组与遥感和矢量图叠加对应分析，结合野外调查资料来划分土壤-植被系统群系。
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