摘要
土壤空间信息的矢量-栅格转换是利用土壤数据进行地表碳、氮等模拟研究的重要基础,由土壤矢量图转化成栅格图时,不同分类级别土壤矢量图与可转化为最小栅格之间的关系一直不够明确。本文利用江西省余江县1∶5万土壤图,研究了在土类、亚类、土属和土种分类水平上,土壤矢量图转化成不同大小栅格图过程中各类土壤分布的面积变化,设定某类土壤栅格分布总面积占同类土壤矢量面积的95%时所对应的栅格大小视为最小可分栅格,并且在不同土壤分类级别的土壤矢量图中,定义面积小于10 km2的土壤类型为小面积土壤类型、面积介于10 km2至100 km2的土壤类型为中等面积土壤类型,面积大于100 km2的土壤类型为大面积土壤类型。结果表明:余江县土壤空间数据的矢量-栅格在转换过程中,由于面积过小和图斑过于分散使得各土壤分类级别均有小面积土壤类型和部分大、中面积土壤类型的栅格面积随着栅格尺度的变小而变大;图斑聚集的大面积土壤类型和中等面积土壤类型栅格面积伴随栅格尺度的变小而变小;土类和亚类中,最小可分栅格分别为1 km和0.2 km,在土属和土种中,最小可分栅格均为0.1 km。
Vector-grid transformation of soil spatial information is the essential basis for interpretive study on land surface C and N,making use of soil data.In transforming soil vector maps into grid maps,how soil vector maps of different classification grades are related to the smallest transformable grid still remains unclear.A 1∶ 50 000 soil map of Yujiang County,Jiangxi Province,was used to study changes in acreage of the distributions of various types of soils in the process of soil vector maps of various classification grades（group,sub-group,genus and species） transforming into grid maps different in grid size,given that when the total distribution area of the grids of a certain soil type accounts for 95% of the area of the soil type in the soil vector map,the corresponding grid could be deemed as the smallest dividable grid.The research defines that the soil type which area is lower than 10 km^2 is the small type soil type,area between the 10 km^2 and the 100 km^2 is the middle area soil type,larger than 100 km^2 is the large area soil type.Results show in transforming the soil spatial information from vector into grid,being too small in area or too dispersed in patch distribution,soil types small in area in all the soil classification grades would increase in grid area with the grid decreasing in size and even some soil types,large or moderate in area would show the same trend.Some soil types,large or moderate in area with patches in cluster,would decline in grid area with the grid decreasing in size.For soil groups,subgroups,genus and species,the smallest dividable grid is 1 km,0.2 km,0.1 km and 0.1 km,respectively.
出处
《土壤学报》
CAS
CSCD
北大核心
2011年第3期470-478,共9页
Acta Pedologica Sinica
基金
中国科学院知识创新工程重大项目(KSCX1-YW-09-02)
中国科学院知识创新工程重要方面项目群(KZCX2-YW-Q1-07和15)共同资助
国家重点基础研究发展计划项目(2010CB950702)
