Key soil properties and their simple field assessment in the Hyrcanian forest, Iran: From soil to vegetation

Introduction: In general, when the study and analysis of soils, particularly in forest ecosystems, are considered, issues such as time, cost, and methodological complexity are among the primary challenges. A comprehensive and well-designed soil assessment inevitably involves these limitations. Nevertheless, researchers, managers, and practitioners working in natural ecosystems continuously seek approaches that maintain an acceptable level of accuracy while being cost-effective and relatively simple to implement. The main objective of this paper is based on this concept: to identify, among the wide range of soil characteristics, the key properties that can effectively provide meaningful information about soil functions and roles within forest ecosystems. Once these essential properties are identified, the secondary objective is to introduce practical field-based methods for their assessment that are affordable, feasible, and sufficiently reliable for application in forest environments.
Main structure: In soil science, soil properties and processes are generally classified into three major groups: physical, chemical, and biological characteristics. Each group includes numerous attributes that, individually or collectively, contribute to understanding soil conditions and ecosystem functions. However, based on extensive scientific research and empirical evidence, some properties within each category have been recognized as particularly important due to their strong influence on soil performance and their relationships with other soil characteristics. Therefore, evaluating these key indicators can provide valuable insights and, in many cases, allow the estimation of additional soil attributes. Among physical properties, soil texture and soil compaction are considered fundamental indicators, while soil organic matter content and soil pH are among the most important chemical properties, with soil pH also influencing biological processes and nutrient availability. These characteristics are especially important in forest soils because they directly affect soil fertility, water availability, root development, and vegetation dynamics. Although accurate measurement of these properties is typically conducted under laboratory conditions, their approximate values can also be assessed in forest environments using simpler, more accessible field methods. Beyond soil characteristics, another essential component of forest ecosystem assessment is the evaluation of vegetation cover, ranging from herbaceous ground vegetation to overstory tree species. Understanding plant communities, their ecological requirements, and their distribution patterns across different sites can provide valuable information about soil conditions and other ecosystem processes. Vegetation can therefore serve as an ecological indicator, reflecting the integrated effects of soil properties, environmental conditions, and ecosystem functioning.
Conclusion: Professionals working in natural ecosystems, particularly forest environments, continually seek approaches that balance accuracy, efficiency, and cost-effectiveness. This requirement is especially important in forest soil studies, where assessments are often associated with considerable complexity, time requirements, and financial costs. Considering forest vegetation as a reflection of overall ecosystem conditions provides a valuable opportunity to improve the efficiency of soil assessment approaches. Meanwhile, for researchers, managers, and forest specialists, understanding key soil properties, including soil texture, bulk density, compaction, soil pH, and organic matter content, and identifying practical methods for their field evaluation can provide an effective strategy for reducing resource requirements while maintaining reliable and informative assessments. Such approaches can contribute to improved forest monitoring, management, and conservation planning.