Title :
Spatial heterogeneity of surface soil nutrients in small scale in the black soil region of Northeast China
Author :
An Zhang ; Lili Jiang ; Qingwen Qi ; Xiaofeng Li ; Longfeng Pi
Author_Institution :
State Key Lab. of Resources & Environ. Inf. Syst., Inst. of Geogr. Sci. & Natural Resources Res., Beijing, China
Abstract :
In traditional crop production, farmers considered cultivated land as uniform growth conditions and take the same plan. In fact, There is a obvious spatial heterogeneity on farmland inside. The differences of micro topography and soil fertility affect the crop growth and yield. In our research, a experimental field is selected in a farm in Heilongjiang province, China. We collected 123 topsoil (0-20 cm) samples, and measured soil organic matter (SOM), ammonium nitrogen (NH3-N), soil available phosphorus (SAP) and soil available potassium (SAK). After descriptive statistics analysis of surface soil nutrients and semivariogram analysis. The fitting model and parameters of each surface soil nutrients were given. Spatial heterogeneity exists in surface soil nutrients. Especially, the topsoil (0-20 cm) soil organic matter present obvious regional regularity. The spatial distribution map of surface soil nutrients were drawn by the Kriging interpolation method. The research of spatial heterogeneity of surface soil nutrients in small scale provide the basis for the model of variable rate fertilization.
Keywords :
geochemistry; soil; vegetation; Heilongjiang province; Kriging interpolation method; Northeast China; ammonium nitrogen; black soil region; crop growth; crop production; crop yield; descriptive statistics analysis; microtopography; semivariogram analysis; soil available phosphorus; soil available potassium; soil fertility; soil organic matter; surface soil nutrients; uniform growth conditions; variable rate fertilization; Agriculture; Distribution functions; Graphical models; Interpolation; Nitrogen; Soil; Surface soil; Black soil Region; Spatial Heterogeneity; Surface Soil Nutrients; small scale;
Conference_Titel :
Agro-geoinformatics (Agro-geoinformatics 2014), Third International Conference on
Conference_Location :
Beijing
DOI :
10.1109/Agro-Geoinformatics.2014.6910654