次生林主要类型生态位土地分类方法

APPROACH OF LAND CLASSIFICATION WITH SPATIAL NICHE OF MAIN TYPES OF SECONDARY FORESTS

文章以帽儿山地区次生林为例,应用地理信息技术进行生态位土地分类.在分类模型构造的研究中获得了生态位土地分类的模式:应用交互信息分析方法确定次生林与生态位分类因子的依存程度→以精度和可靠性为原则选定最终土地分类因子→以信息增量为判别分类的测度→处理基础数据,计算各次生林立地组的信息量并存入计算机→判别空间单元的分类归属.在地图分析模型构造的研究中,应用空间插值和邻域分析获得了各空间单元的海拔、坡度及坡向数据,应用再分类及叠加技术获得了帽儿山林场次生林生态位分类地图和统计数据.研究表明,以地理信息系统为基础所形成的生态位土地分类方法具有很大的应用价值和潜力.

Taking the secondary forests in Maorshan Experimental Forest Farm,Northeast Forestry University, as an example, the land classification with spatialniche was conducted using GIS. In modeling classification the procedure andpattern to criticize the land classification were determined. That is: using themethod of mutual information analysis to determine the correlativity of secondaryforests with factors of niche classification; selecting optional factors for landclassification based on the principles or precision and reliability; taking the modelof information gain as the measurement to treat the original data; calculating theinformation content of different site groups of secondary forests and inputing intocomputer; criticizing and assing the land class to every spatial element. In theresearch of modeling map analysis for land classification, data of elevation, slopeand hill aspect for every spatial element were obtained by spatial interpolationand neighbourhood analysis. Finally, by reclassification and overlay, the map andstatistics of land classification on ecological niche for the reseached area wereobtained. The reseach indicated that this classification method depended on GIShas greater application value.