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جغرافیایی 2021, 21(73): 141-153 Back to browse issues page
Spatial Analysis of the Relationship of Oak Forest die back with Recent Droughts in Ilam Province
SHAMSOLLAH ASGARI *1, Tayeb Raziei2, Ahmad Hosini3
1- Assistant Prof., Research Division of Natural Resources, Ilam Agricultural and Natural ResourcesResearch Center (AREEO), Ilam, Iran
2- Associate Prof, Soil Conservation and Watershed Management Research Institute (SCWMRI), Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
3- Associate Prof., Research Division of Natural Resources, Ilam Agricultural and Natural ResourcesResearch Center (AREEO), Ilam, Iran
Abstract:   (360 Views)
One of the important issues in recent years is the drying up of Zagros oak forests and since Zagros oak forest is one of the natural resources of Ilam province, this issue needs to be evaluated. The main purpose of this study is to analyze the spatial relationship between drought in Zagros forests and droughts in the area. For the spatial and temporal analysis of drought in Ilam province, Standard Precipitation Index (SPI) for the period 2000 to 2016 was used from the rainfall data of the province and for spatial analysis of oak forest drying relationship using spatial pattern distribution models, Moranchr('39')s spatial autocorrelation model. A systematic random sampling of 15 m2 of dried oak trees at the surface of the area was performed using GPS and simulated using Landsat satellite images with 15 m2 resolution. The results of Moran model showed that oak drought has a cluster pattern and the Moran index with SPI coefficient was 0.914532 in positive drought zone and 0.938461 in severe drought zone and 0.985233 in relatively dry zone and 996512 in near-normal drought zone. The mean Moran index was 0.956758 with a significant level of 0.00001 indicating the effect of drought on oak dryness.
Keywords: Drought, Oak Drying, Precipitation, Spatial Analysis, SPI
Full-Text [PDF 1312 kb]   (92 Downloads)    
Type of Study: Research | Subject: Special
Received: 2019/10/9 | Accepted: 2020/10/20 | Published: 2021/05/31
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ASGARI S, Raziei T, Hosini A. Spatial Analysis of the Relationship of Oak Forest die back with Recent Droughts in Ilam Province. جغرافیایی. 2021; 21 (73) :141-153
URL: http://geographical-space.iau-ahar.ac.ir/article-1-3545-en.html


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