| Cultivated land resources relate to the growth of crops, goodharvest of food, vital interests of the peasants and the developmentof human existence.The research on irrigation-silted soil propertiesplays a dominant part in the sustainable development of Chineseagriculture and the survival of the human race. The source of datais from a test about400soil samples in Yaodu district. Usingclassical statistics and ArcGIS geostatistical spatial analysismethords, the author intends to research on the spatial variabilityof soil particle size and trace elements as Fe, Mn, Cu and Zn inirrigation-silted soil in Yaodu district. The main results are asfollows:The study of the soil particles composition indicates that, theparticles in the irrigation-silted soil in study area is mainly thepowder particle, the average content of crude powder particle is50.97%, the percentage content in the region’s soil particlecomposition is the highest. Apart from the coarse sand particle andgravel that belong to strong variability others all belong to moderatevariability. The main soil particles in Jindianzhen and Tumenzhenare clay particle and powder particle which are composed by thesmaller particles; In the whole study area, the content of coarse sand and gravel is the highest in Liucunzhen. Hejiazhuang is theregion’s only town that there is no coarse sand; the content of crudepowder particle and fine sand particle are more in the North-Eastand South-West of the study area. As far as the different types ofsoil, the content of fine clay particle, rough clay powder, finepowder particle, intermediate powder, coarse sand particle andgravel powder in the alluvial soil is more than the brown soil; but thepercentage content of crude powder particle and fine sand particlein the brown soil is lower than the brown soil; the percentageconcent of gravel powder is zero in the brown soil.Fine clay particle has the effect of first-order trends both inNorth-South direction and East-West direction in theirrigation-silted soil in study area; Rough clay powder, fine particle,intermediate powder and coarse powder particle all have both theeffect of first-order trends in East-West direction and the effect ofsecond-order trends in North-South direction. The best theoreticalsemivariogram model of the fine clay particle and coarse powderparticle is Exponential model, the best theoretical semivariogrammodel of the rough clay powder, fine particle, intermediate powderand fine sand is Spherical model. Fine clay particle, rough claypowder, fine particles, intermediate powder, coarse powder particleand fine sand had moderate spatial correlation. Fine clay particlehas a greater variability in the135°direction, rough clay powder,fine particle and intermediate powder all have a greater variabilityin the45°direction. Coarse powder particle and fine sand have agreater variability in the90°direction. The Interpolation of spatialdistribution map of soil granularity shows that: the content of the clay, fine particles and intermediate powder is on a declining trendby the West Bank of Fenhe River to the South-East direction. Coarsepowder particle gradually declining from the South-East to theNorth West in the study area; The spatial variation of fine sand isnot obvious, is mainly distributed in the north-eastern edge of thestudy area and Duandianzhen which is in the eastern shore of theFenhe River.The content of available Fe is very poor in the study area, whilethe content of available Cu and available Mn are higher, Comparedto the soil survey in linfen,1987, the content of available Znincreased in a certain extent, but in the Northwest and Northeast ofthe study area there is a problem that the content of available Zn ispoor. The content of available Fe, available Mn and available Cu inthe alluvial soil is less than the brown soil; the content of availableZn in the alluvial soil is more than the brown soil. In four traceelements, in addition to the available Fe and Zn do not reach thesignificant sex-related, there is a significant positive correlationbetween the other trace elements.Available Fe in study area has the effect of first-order trends inNorth-South direction and the effect of second-order trends in East-West direction; Available Mn has the effect of second-order trendsboth in North-South direction and East-West direction; Available Znand available Cu both have the effect of second-order trends inNorth-South direction and the effect of first-order trends inEast-West direction. The better theoretical semivariogram modelsof available microelements are spherical model for Fe, exponential model for Mn, Cu and Zn. The nuggets value of the available Mn isrelatively large, the spatial correlation degree of the available Zn inSpatial distribution is weaker, available Fe, Mn, and Cu all have themoderate spatial correlation. The range of available Zn is Maximumin the four kinds of trace elements, reflects that human activity playa major role on its content distribution. In the spatial distributionmap, available Fe and Cu evidently form striped trend along the river,and the content on the East bank is more than the West bank,available Mn is mainly accumulated in the South-East andNorth-West. Available Zn gradually is declined from the southwestto the Northeast. |
