Pedodiversity patterns based on Terrain in Henan Province
Henan Province was selected as a case at provincial scale.This study applied the spatial grain size method at 1 km × 1 km grid scale,explored the richness index S,classical soil diversity index H'and the evenness index E.The purpose of this study was to know the classical soil composition diversity in different terrains and the proportion of the area of each soil type in the total area at the same soil group and soil spatial diversity (such as great soil group) using modified Shannon index (Yh).Results showed that there were four different terrain types including plains,hills,mountains and basins based on DEM model in Henan Province.And plain topography was the main terrain.There were 15 soil types (soil group) in Henan Province.And soil richness decreased from plain terrain,hilly terrain,mountain to basin terrain,richness index S increased with the increase of terrain area,and they were fitted with polynomial function.Classical diversity index H'showed increasing trend from soil group,subgroup to soil families.Whereas the diversity value of soil group and subgroup followed "first rise then fall" trend,and that of soil family followed a falling trend.The evenness of soil families was higher than that of soil group and subgroup.And from plain terrain,hilly terrain,mountain to basin terrain,the evenness index E and soil composition component diversity all showed a trend of "first rise and then fall".Soil branch rate and soil composition diversity were fitted with polynomial function.There was close connection among terrain,soil formation and soil spatial distribution diversity in Henan Province.For example,the vast plains provided a good regional background conditions for the distribution of Chao Soil,while narrow area of Chao Soil was distributed at the bottom of mountain valley in mountainous terrain.Chao Soil as the dominant soil type discretely distributed in plain terrain due to large patch number,patch area and diversity index.At the same time,less area of salt and alkali soil was mainly distributed in plain terrain.Cinnamon Soil with the largest area was mostly distributed in mountain terrain and hilly terrain.Huanghe Soil and Shajiang Soil were the major soil types in basin terrain.By contrast,spatial distribution index Yh was better than the other indices in the expression of soil spatial distribution under different terrains.
NETL
NSTL
万方数据
维普
