Biomass and carbon stock in deadwood, litter, and soil of Persian oak (.Quercus brantii Lindl) stands in Lordegan County, Iran | ||
| تحقیقات جنگل و صنوبر ایران | ||
| Article 6, Volume 32, Issue 4 - Serial Number 98, March 2025, Pages 373-389 PDF (449.73 K) | ||
| Document Type: Research article | ||
| DOI: 10.22092/ijfpr.2024.365345.2156 | ||
| Authors | ||
| Y. Iranmanesh* 1; M.K. Parsapour2 | ||
| 1Corresponding author, Associate Prof., Department of Natural Resources Research, Agricultural and Natural Resources Research and Education Center of Isfahan Province, ARREO, Isfahan, Iran | ||
| 2Postdoctoral Researcher, Department of Natural Resources Research, Agricultural and Natural Resources Research and Education Center of Chaharmahal and Bakhtiari Province, ARREO, Shahrekord, Iran | ||
| Abstract | ||
| Background and Objective: Zagros forests, as one of Iran's most important carbon sinks, play a crucial role in maintaining ecosystem balance and the carbon cycle. Given the increasing threats to these forests, accurately identifying and assessing carbon stocks in various forest components, such as deadwood, litter, and soil, is particularly important. This study aims to investigate how the stand form (high forest and coppice) of Persian oak (Quercus brantii Lindl.) affects biomass and carbon stock in deadwood, litter, and soil in the Atashgah forest area of Lordegan County in Chaharmahal and Bakhtiari Province, Iran. The goal is to provide more accurate data to support better and more sustainable management of these vital ecosystems. Methodology: This study evaluated the aboveground biomass and carbon stocks of deadwood, litter, and soil in high forest and coppice of Persian oak trees in the Lordegan forest zone. The study area, covering 90 hectares, is located in the central Zagros plateau and is predominantly characterized by Persian oak vegetation. Thirty random sample plots of 1000 square meters each were established to select sample trees. Within each plot, the nearest tree to the center that fell within the desired diameter class was chosen, ensuring samples were collected across different diameter at breast height (DBH) classes for single-stem trees and different crown diameter classes for coppice shoots. Following this procedure, 16 single-stem and 14 coppice trees were randomly selected and marked for measurement. The selection aimed to quantify the amount of standing deadwood in the form of dried branches present in the investigated trees. Litter and soil samples were collected from a depth of 0 to 30 centimeters beneath each tree. A computational formula based on carbon concentration, bulk density of the soil, sampling depth, and the percentage of coarse fragments was used to measure soil organic carbon. The collected samples were transferred to the laboratory for determination of dry weight and carbon content, following standard methods for measuring the percentage of organic carbon in plant and soil samples. Results: The findings showed that standing deadwood in high forest trees had significant statistical differences among various diameter classes, while fallen deadwood did not exhibit such differences. The highest values of standing deadwood biomass were observed in the 30-40 cm diameter class. In contrast, in coppice shoots, fallen deadwood biomass showed significant statistical differences among different crown diameter classes. However, the difference in standing deadwood biomass between different crown diameter classes of coppice shoots was insignificant. A comparison between high forest and coppice revealed that standing deadwood biomass in high forest trees exceeded that in coppice. Additionally, the average carbon sequestration of deadwood in the study area was calculated as 0.171 tons per hectare. No significant statistical differences were observed in soil carbon, nitrogen, and phosphorus content between high forest and coppice bases. A high correlation coefficient of 0.94 was observed between soil carbon and nitrogen, while no significant correlation was found between soil carbon and phosphorus. The carbon content of litter did not show significant statistical differences between high forest and coppice in the study area. Overall, the average carbon sequestration of litter in the study area was estimated as 0.327 tons per hectare. Conclusion: Despite considerable attention to aboveground and belowground carbon stocks in forest ecosystems, carbon stored in deadwood has received less emphasis. However, deadwood can represent a significant portion of forest carbon reserves. Dominant tree species and structural characteristics of the forest, such as population density, diameter at breast height, and tree height, are important factors in determining aboveground biomass and carbon storage. This study identified the average quantitative differences between high forest and coppice trees as the main reasons for differences in aboveground biomass and carbon storage in standing and fallen deadwood. Furthermore, the impact of disturbances and human interventions on the reduction of soil carbon stocks was examined. The study found that soil carbon stocks were similar in both growth forms, which was related to the similarity in litter volume in the two habitats. This research highlights the importance of carbon storage in deadwood, litter, and soil and its impact on forest ecosystems, contributing to improved forest management and biodiversity preservation. | ||
| Keywords | ||
| Aboveground biomass; fallen deadwood; growth form; standing deadwood; Zagros | ||
| References | ||
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