Document Type : علمی - پژوهشی
Authors
1
Assistant Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, I.R. Iran
2
Associate Prof., Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, I.R. Iran
3
Forest Expert, Department of Natural Resources of Langroud, Guilan Natural Resources and Watershed Administration, Rasht, Iran.
4
Expert, Research Division of Natural Resources, Guilan Agricultural and Natural Resources Research and Education Center, AREEO, Rasht, Iran
5
Forest Expert, Guilan Natural Resources and Watershed Administration, Rasht, Iran
Abstract
Monitoring the current status of existing afforestation’s in management decisions is very important for the development of afforestation’s in the future. This study was conducted in order to monitor the area, distribution and health of afforestation’s in Langroud county, Guilan province. For this purpose, first, field surveys were done in the form of land points from the existing afforestation, and the distribution map of afforestation was prepared using the land surveys, GPS Fields Area Measure PRO application (GFAMP), and Google Earth system. Then the Sentinel 2 satellite image related to the growing season in Langroud county was prepared from the Copernicus site. From the Sentinel 2 satellite images, various vegetation indices such as NDVI, TNDVI, SAVI and RVI related to the growing season were extracted and their maps were prepared in the area of afforestation. In the following, the amount of each vegetation index studied was extracted at the points of land harvesting and the correlation of the values of each vegetation index (resulting from satellite images of the growing season of Sentinel 2) with the health of afforestation (resulting from field harvesting) was investigated. For this purpose, Pearson's correlation coefficient was used. Then, the index that showed the highest correlation with the health of afforestation in Langroud county (NDVI) was selected as the most important index to estimate the health of afforestation and its regression relationship with the health of afforestation was obtained. In the following, using the map of the most favorable vegetation index, information of field harvests and the relationship between these two cases, a health map of afforestation in Langroud county was prepared. The results showed that the area of afforestation in this county is 746.2 ha, which are mainly distributed in the southwest of the county. In addition, the results showed that the Normalized Difference Vegetation Index (NDVI) is the most favorable vegetation index for estimating the health of afforestation in Langroud county. Of the current total area of afforestation, 400.56 ha are in full health status, 305.60 ha are in medium health status, and 40.04 ha are in unhealthy status. The results of this research will help the forest managers for quantitative and qualitative monitoring of afforestation and its continuity in certain time periods as well as future afforestation development plans.The results showed that the area of afforestation in this county is 746.2 ha, which are mainly distributed in the southwest of the county. In addition, the results showed that the Normalized Difference Vegetation Index (NDVI) is the most favorable vegetation index for estimating the health of afforestation in Langroud county. Of the current total area of afforestation, 400.56 ha are in full health status, 305.60 ha are in medium health status, and 40.04 ha are in unhealthy status. The results of this research will help the forest managers for quantitative and qualitative monitoring of afforestation and its continuity in certain time periods as well as future afforestation development plans.n addition, the results showed that the Normalized Difference Vegetation Index (NDVI) is the most favorable vegetation index for estimating the health of afforestation in Langroud county. Of the current total area of afforestation, 400.56 ha are in full health status, 305.60 ha are in medium health status, and 40.04 ha are in unhealthy status. The results of this research will help the forest managers for quantitative and qualitative monitoring of afforestation and its continuity in certain time periods as well as future afforestation development plans.Of the current total area of afforestation, 400.56 ha are in full health status, 305.60 ha are in medium health status, and 40.04 ha are in unhealthy status. The results of this research will help the forest managers for quantitative and qualitative monitoring of afforestation and its continuity in certain time periods as well as future afforestation development plans.n addition, the results showed that the Normalized Difference Vegetation Index (NDVI) is the most favorable vegetation index for estimating the health of afforestation in Langroud county. Of the current total area of afforestation, 400.56 ha are in full health status, 305.60 ha are in medium health status, and 40.04 ha are in unhealthy status. The results of this research will help the forest managers for quantitative and qualitative monitoring of afforestation and its continuity in certain time periods as well as future afforestation development plans.
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