| The spatial pattern of soil organic matter in the Loess Plateau with village scale based on ArcGIS geostatistics |
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| DOI：10.7606/j.issn.1000-7601.2010.04.35 |
| Key Words: ArcGIS geostatistics loess plateau village scale soil organic matter spatial pattern |
| Author Name | Affiliation | | GAO Yimin | College of Resources and Environment, Norhwest A&F University, Yangling, Shaanxi 712100, China | | TONG Yanan | College of Resources and Environment, Norhwest A&F University, Yangling, Shaanxi 712100, China | | CHANG Qingrui | College of Resources and Environment, Norhwest A&F University, Yangling, Shaanxi 712100, China | | ZENG Yanjuan | College of Resources and Environment, Norhwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| The objective of this study was to explore the relationship between spatial variability of soil organic matter
and agro-ecological environment in the Loess Plateau. Geostatistics module of ArcGIS was applied to study the spatial variability and spatial pattern of soil organic matter, based on the data of 360 soil samples that were taken by grid sam-pling method in Xinji village in Shaanxi as the case study. The results indicated that the average content of soil organic matter was 3.37 g/kg, with a normal distribution in the study area. The distribution of soil organic matter content in the whole area exhibited a first-order trend. The best theoretical model was spherical model, with anisotropy . The spatial au-tocorrelation distances (ranges)were 965.7 m and 440.3 m in long axle and in short axle, respectively, and the degree of spatial autocorrelation was moderate. A spatial distribution map of soil organic matter content was obtained using ordi-nary Kriging interpolation, which showed that soil organic matter was higher in north and center than that in south and around，turming out ladder-like distribution trends. This spatial pattem was consistent with tructural factors (topography) and random factors (land-use types). |
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