Monitoring the physical and chemical properties of the soil in relation to the oak decline phenomenon in the Zagros forests (Case study: Chaharmahal and Bakhtiari province)

Document Type : Research Paper

Authors

1 Research Division of Natural Resources, Chaharmahal and Bakhtiari Agricultural and Natural resources Research and Education Center, AREEO, Shahrekord, Iran.

2 Research Institute of Forest and Rangelands, Agricultural Research, Education and Extension Organization, Tehran, Iran.

3 Research Institute of Forest and Rangelands, Agricultural Research, Education and Extension Organization, Tehran, Iran. Head of Forest Research Laboratory (RIFR), Tehran, Iran

4 Research Division of Natural Resources, Chaharmahal and Bakhtiari Agricultural and Natural Resources Research and Education Center, AREEO, Shahrekord, Iran.

5 Soil and Water Research Department, Chaharmahal and Bakhtiari Agricultural and Natural resources Research and Education Center, AREEO, Shahrekord, Iran.

10.22059/jfwp.2024.372302.1283

Abstract

This study was conducted in the Zagros forests to investigate and monitor the status of elements in the soil and their absorption in areas with and without oak decline. Two plots, each with 100 trees, were randomly established in the south direction in the areas of "Sama Castle" and "White Mud," representing the decline and control (without decline) sites. In the oak decline plot, five healthy and five declining trees were selected, while only five healthy trees were chosen in the control plot. Selection of healthy and declining trees in the first year was done selectively and with proper distribution throughout the sample. In the following years, soil and leaf samples were collected from the selected trees. Soil samples were collected under the tree crowns at two depths (0-30 cm and 30-60 cm). Additionally, 20 leaves per tree were sampled in late July and early August. The results showed that the amount of phosphorus in the leaves of trees in the both decline and control sites was significantly different at a 99% confidence level. As the intensity of drought increased, the amount of phosphorus in the leaves also increased. Soil moisture was estimated at 5.74% in the decline site and 7.14% in the control site, with this difference being statistically significant. The amount of calcium in the soil of the control area was approximately 1.5 times greater than in the area experiencing decline. The results of this research, focusing on soil characteristics related to oak decline, can provide important data for the oak decline information system in the Zagros forests of Iran.

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Main Subjects


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