| According to the SOCD data in the surface of the soil and landform characteristices in Shehong,based on SPSS 13.0 and ArcGIS9.2,using general statistical method and geo-statistics,study on statistical,spatial variation characters and the influence factors of SOCD in microscale,mesoscale and macroscale. The results of the study are as follows.The mean of SOCD of low hilly,medium hilly and high hilly in microscale were 4.26 kg m-2,4.03 kg m-2,3.56 kg m-2,and there were significant differences of between different landforms(P=0.011);there were no significant differences between each region in the same landforms(P>0.05).The most fitting models were gaussian model and exponential model in different landforms.The ratio of nugget and sill were between 0.211 to 0.915;it showed that the spatial variation characters of the regions in different lanforms were most of randomness variation,but excepet Ls1,Ls2,Hs4 and Hs5.The fragmentation D was between 1.769 to 1.99995,it showed that the spatial variation extent of most regions were similar.The density classes of SOCD were centralizing in 3.5-4.5 kg m-2 in low hilly, between 3.0-4.0 kg m-2 in high hilly, and the medium was between low hilly and high hilly.The mean of SOCD of low hilly,medium hilly and high hilly in mesoscale was 3.61 kg m-2,3.56 kg m-2,3.30 kg m-2.and there were significant differences of between different landforms(P=0.000).There were significant differences between each region in low hilly(P=0.050),extremely significant differences between each region in high hilly(P =0.000).The most fitting models were gaussian model and exponential model in different landforms.The ratio of nugget and sill were between 0.499 to 0.971;it showed that the spatial variation characters of the regions in different lanforms were most of randomness variation,but excepet Lm3.The fragmentation D was between 1.740 to 1.966,it showed that spatial variation extent of most regions were similar. The density classes of SOCD were centralizing in<4.0 kg m-2 kg m-2 in different landforms.The mean of SOCD of macroscale was 3.37kg m-2.The ratio of nugget and sill was 0.981,fragmentation D wasl.9956,this showed that the spatial correlation was most of randomness variation.The density classes of SOCD were centralizing in <4.0 kg m-2 kg m-2,and the ratio was 89.93%. The influence degree of parent materials,soil types and land-use types for SOCD characters in microscale,mesoscale and macroscale were different.Parent materials,soil types and land-use types had extremely significant influence on SOCD in microscale. The comparison result of SOCD showed that mudstone was extremely significant higher than sandshale(P=0.000), and the later and siltstone had extremely significant(P=0.007);the alluvium was significant higher than siltstone(P=0.013),but had no significant difference with other parent materials(P>0.05). The comparison result of SOCD of different soil types showed that the paddy soil was significant higher than fluvo-aquie soil (P=0.015),extremely significant higher than purple soil (P=0.000),and the two laters had no significant;yellow soil and other three soil types had no significant difference(P>0.05).Comparison result of SOCD in different land-use types showed that the paddy field and forest land were separately extremely significant higher than dry land(P=0.000), paddy field was significant higher than than forest land(P=0.038),and the later was extremely significant higher than dry land(P=0.000).Parent materials,soil types had extremely significant influence on SOCD(P=0.000),and land-use types had significant influence on SOCD in mesoscale(P=0.017).The comparison result of SOCD showed that alluvium,mudstone, sandshale were extremely significant higher than siltstone(P=0.000);mudstone was extremely significant higher than alluvium(P=0.000),and the later was extremely significant higher than and sandshale(P=0.001).The comparison result of SOCD of different soil types showed that the paddy soil was extremely significant higher than fluvo-aquie soil and yellow soil(P=0.000),and the two laters had no significant difference(P>0.05),but they were extremely significant higher than purple soil (P<0.01).Comparison result of SOCD in different land-use types showed that the paddy field and forest land were significant higher than dry land(P=0.046),extremely higher than forest land(P=0.005),but dry land and forest had no significant difference(P>0.05).Parent materials,soil types had extremely significant influence on SOCD(P=0.000),and land-use types had significant influence on SOCD in mesoscale (P=0.036).The comparison result of SOCD showed that mudstone>alluvium> siltstone>sandshale,and three were extremely significant between each other(P=0.000). The comparison result of SOCD of different soil types showed that the paddy soil was extremely significant higher than fluvo-aquie soil and yellow soil(P=0.000),and the two laters had no significant difference(P>0.05),but they were extremely significant higher than purple soil (P=0.000).Comparison result of SOCD in different land-use types showed that the paddy field,dry land were seperatel significant higher than forest land,paddy field and dry land had no significant difference(P.0.05). |
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