Identification of Spatial Outliers by Moran’ s Index and Evaluation of Their Effects on the Spatial Distribution of Soil Organic Matter

Q: How can I download an article?

To download an article from SID, first log in to the site, search for the article title, and click on the 'Download Article' option.

Q: How can I download an ISI article?

To download an ISI article on SID, enter the keyword or article title in the search bar, view the relevant results, click on the desired article, and select the 'Download Article' option.

Q: How can I access the SID database?

To access the SID database, visit SID.ir, create an account, and log in to access scientific resources.

Q: Is downloading articles from SID free?

Some articles on SID are available for free, while others require payment. Details are specified on the article's page.

ASADZADEH FARROKH; RAHMATI MARYAM; ASGARZADEH HOSEIN

Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Journal Paper

Paper Information

Journal: Iranian Journal of Soil Research Year:2016 | Volume:30 | Issue:3 Page(s): 281-293

Download Full-Text

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Persian Verion

View:

1,009

Download:

Cites:

Information Journal Paper

Title

Identification of Spatial Outliers by Moran’ s Index and Evaluation of Their Effects on the Spatial Distribution of Soil Organic Matter

Author(s)

ASADZADEH FARROKH | RAHMATI MARYAM | ASGARZADEH HOSEIN | Issue Writer Certificate

Keywords

Global outlierQ1

KrigingQ2

spatial structureQ1

UrmiaQ2

Abstract

Soil organic matter (SOM) is a key index in evaluation of the soil degradation and soil carbon sequestration. Therefore, determination of the SOM spatial patterns is essential for developing the suitable strategies of soil and ecosystem management. Geostatistical methods such as Kriging have been widely employed to investigate the spatial pattern of different soil properties like SOM. The quality of the spatial maps is significantly influenced by the statistical properties of the raw data. Thus, identification and elimination of spatial outlier data, which has rarely been considered in previous works, is an important step in preparation of accurate and suitable maps of soil organic matter. The aim of the present study was to evaluate the effect of spatial outliers on the spatial pattern of soil organic carbon at the Rozeh-Chay watershed, Urmia, west Azarbayjan province. A total of 89 surface soil samples (0-10 cm) were collected based on the stratified random sampling scheme. After the normalization of the raw SOM data, Global outliers were eliminated by box plot method. Spatial outliers were identified by the global and local Moran’ s I indices. Spatial correlogram of the global Moran’ s I showed the highest spatial autocorrelation at distance of 900 m, which was used as a distance band for preparation of spatial clusters map by local Moran’ s I index. Cluster map of the local Moran’ s I index showed four spatial outliers which were eliminated to assess their effects on the accuracy of Kriging map of SOM. With the elimination of the spatial outliers, the MAE and RMSE of the SOM map were decreased from 0. 97 and 1. 31 to 0. 85 and 1. 12, respectively. Therefore, the accuracy of the Kriging map increased by 13. 5 percent. Generally, it can be concluded that the combination of Moran’ s I index and Kriging method improves the efficiency of organic matter map in the study area.

Cites

No record.

References

No record.

Cite

APA: Copy

ASADZADEH, FARROKH, RAHMATI, MARYAM, & ASGARZADEH, HOSEIN. (2016). Identification of Spatial Outliers by Moran’ s Index and Evaluation of Their Effects on the Spatial Distribution of Soil Organic Matter. IRANIAN JOURNAL OF SOIL RESEARCH (FORMERLY SOIL AND WATER SCIENCES), 30(3 ), 281-293. SID. https://sid.ir/paper/159026/en

Vancouver: Copy

ASADZADEH FARROKH, RAHMATI MARYAM, ASGARZADEH HOSEIN. Identification of Spatial Outliers by Moran’ s Index and Evaluation of Their Effects on the Spatial Distribution of Soil Organic Matter. IRANIAN JOURNAL OF SOIL RESEARCH (FORMERLY SOIL AND WATER SCIENCES)[Internet]. 2016;30(3 ):281-293. Available from: https://sid.ir/paper/159026/en

IEEE: Copy

FARROKH ASADZADEH, MARYAM RAHMATI, and HOSEIN ASGARZADEH, “Identification of Spatial Outliers by Moran’ s Index and Evaluation of Their Effects on the Spatial Distribution of Soil Organic Matter,” IRANIAN JOURNAL OF SOIL RESEARCH (FORMERLY SOIL AND WATER SCIENCES), vol. 30, no. 3 , pp. 281–293, 2016, [Online]. Available: https://sid.ir/paper/159026/en

Related Journal Papers