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Changes in climatic conditions drive variations in arbuscular mycorrhizal fungi diversity and composition in semi-arid oak forests

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JOURNAL OF FORESTRY RESEARCH 2024年第1期35卷 1-14页

作者： Jafarian, Nahid Mirzaei, Javad omidipour, reza Kooch, Yahya Ilam Univ Fac Agr Dept Forest Sci Ilam 69315516 Iran Ilam Univ Fac Agr Dept Range & Watershed Management Ilam 69315516 Iran Tarbiat Modares Univ Fac Nat Resources & Marine Sci Noor *** Mazandaran Iran

Arbuscular mycorrhizal fungi (AMF) play a vital role in plant productivity and ecosystem functions. However, their responses to abiotic factors (i.e., climate, physiography, and soil properties) are unknown, especially across climatic gradients and slope aspects in arid and semi-arid ecosystems. In this study, using 60 composite soil samples, direct and indirect effects of climate factors and slope aspects on AMF diversity, composition and spore density were studied. The findings indicate that climate has a more direct influence on soil properties (P < 0.001) in comparison to slope aspect (P = 0.449). In contrast, climate significantly affected AMF diversity and composition, with the highest diversity in dryer areas. Soil pH had the highest correlation with different facets of AMF diversity. Structural equation modeling (SEM) indicated that only a small part of the variation in AMF diversity and spore density could be explained by climate characteristics, slope aspect and soil properties. Based on SEM results, climate was the most important determinant of AMF diversity and spore density; slope aspect had a less critical role. The outputs suggest that variations in AMF diversity are derived by the direct effects of climate and the indirect effect of soil chemical properties. In addition, with increasing dryness, sporulation and AMF diversity increased.

关键词： AMF diversity and composition Physiographic factors Semi-arid ecosystems Zagros forest SOIL ORGANIC-MATTER SLOPE ASPECT MICROBIAL BIOMASS NUTRIENT-UPTAKE COMMUNITIES PHOSPHORUS GRADIENT BIODIVERSITY RESPOND IMPACT

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Prioritizing woody species for the rehabilitation of arid lands in western Iran based on soil properties and carbon sequestration

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Journal of Arid Land 2020年第4期12卷 640-652页

作者： Masoud BAZGIR reza omidipour Mehdi HEYDARI Nasim ZAINALI Masoud HAMIDI Daniel C DEY Department of Water and Soil Engineering Faculty of AgricultureIlam UniversityIlam ***Iran Department of Range and Watershed Management Faculty of Natural Resource and Earth ScienceShahrekord UniversityShahrekord ***Iran Department of Forestry Faculty of AgricultureIlam UniversityIlam ***Iran US Forest Service Northern Research StationColumbiaOM 65211USA

Plants are an important component in many natural ecosystems. They influence soil properties, especially in arid ecosystems. The selection of plant species based on their adaptations to site conditions is essential for rehabilitation of degraded sites and other construction sites such as check-dams. Other factors to be considered in species selection include their effects on soil properties and their abilities to meet other management objectives. The purpose of this study was to assess the effects of native(Populus euphratica Oliv. and Tamarix ramosissima Ledeb.) and introduced(Eucalyptus camaldulensis Dehnh. and Prosopis juliflora(Swartz) DC.) woody species on soil properties and carbon sequestration(CS) in an arid region of Iran. Soil sampling was collected at three soil depths(0–10, 10–20 and 20–30 cm) at the sites located under each woody species canopy and in an open area in 2017. Soil physical-chemical property was analyzed in the laboratory. The presence of a woody species changed soil characteristics and soil CS, compared with the open area. For example, the presence of a woody species caused a decrease in soil bulk density, of which the lowest value was observed under E. camaldulensis(1.38 g/cm^3) compared with the open area(1.59 g/cm^3). Also, all woody species significantly increased the contents of soil organic matter and total nitrogen, and introduced species had more significant effect than native species. The results showed that CS significantly increased under the canopy of all woody species in a decreasing order of P. euphratica(9.08 t/hm^2)>E. camaldulensis(8.37 t/hm^2)>P. juliflora(5.20 t/hm^2)>T. ramosissima(2.93 t/hm^2)>open area(1.33 t/hm^2), thus demonstrating the positive effect of a woody species on CS. Although the plantation of non-native species had some positive effects on soil properties, we recommend increasing species diversity in plantations of native and introduced woody species to provide more diversity for the increased ecosystem

关键词： arid ecosystem carbon sequestration degraded soil restoration reforestation soil management

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Dieback intensity but not functional and taxonomic diversity indices predict forest productivity in different management conditions: Evidence from a semi-arid oak forest ecosystem

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Journal of Arid Land 2022年第2期14卷 225-244页

作者： Mona KARAMI Mehdi HEYDARI Ali SHEYKHOLESLAMI Majid ESHAGH NIMVARI reza omidipour YUAN Zuoqiang Bernard PREVOSTO Faculty of Natural Resources Chalus BranchIslamic Azad UniversityChalus 46615/397Iran Department of Forestry Chalous BranchIslamic Azad UniversityChalous 46615/397Iran Department of Rangeland and Watershed Management Faculty of Natural Resources and Earth SciencesShahrekord UniversityShahrekord ***Iran Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110164China INRAE Aix Marseille UniversityUMR RECOVERMediterranean Ecosystems and RisksAix-en-Provence 13128France

The relationships between different aspects of diversity(taxonomic,structural and functional)and the aboveground biomass(AGB)as a major component of global carbon balance have been studied extensively but rarely under the simultaneous influence of forest dieback and *** this study,we investigate the relationships between taxonomic,functional and structural diversity of woody species(trees and shrubs)and AGB along a gradient of dieback intensity(low,moderate,high and no dieback as control)under two contrasted management conditions(protection by central government *** management by natives)in a semi-arid oak(Quereus brantii Lindl.)forest *** was estimated and taxonomic diversity,community weighted average(CWM)and functional divergence indices were *** found that the aerial biomass was significantly higher in the intensively used area(14.57(±1.60)t/hm^(2))than in the protected area(8.70(±1.05)t/hm^(2))due to persistence of some large trees but with decreasing values along the dieback intensity gradient in both *** of height(H),leaf nitrogen content(LNC)and leaf dry matter content(LDMC)were also higher in the traditional managed area than in the protected *** contrast,in the protected area,the woody species diversity was higher and the inter-specific competition was more intense,explaining a reduced H,biomass and *** to the results of CWM,none of the functional diversity traits(FDvar)was affected by dieback intensity and only FDvar values of LNC,leaf phosphorus content(LPC)and LDMC were influenced by *** also found significantly positive linear relationships of AGB with CWM and FDvar indices in the protected area,and with taxonomic and structural diversity indices in the traditional managed *** results emphasize that along a dieback intensity gradient,the leaf functional traits are efficient predictors in estimating the AGB in protected forests,while taxonomic and structural indices provide bett

关键词： environmental stress sudden oak dieback degradation conservation selection effect hypothesis

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Interaction between climate and management on beta diversity components of vegetation in relation to soil properties in arid and semi-arid oak forests, Iran

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Journal of Arid Land 2019年第1期11卷 43-57页

作者： Heydari MEHDI Aazami FATEMEH Faramarzi MARZBAN omidipour reza Bazgir MASOUD Pothier DAVID Prévosto BERNARD Department of Forest Science College of Agriculture Ilam University Department of Rangeland and Watershed Management College of Agriculture Ilam University Department of Rangeland and Watershed Management College of Natural Resources and Earth Sciences Shahrekord University Department of Soil Science College of Agriculture Ilam University Department of Wood and Forest Sciences Centre for Forest Research Laval University Irstea-National Research Institute of Science and Technology for Environment and Agriculture

This study aimed to investigate the interaction between regions with different climatic conditions(arid vs. semi-arid) and management(protected vs. unprotected) on the turnover and nestedness of vegetation in relation to physical, chemical and biological properties of soils in the Ilam Province of Iran. In each of the two regions, we sampled 8 sites(4 managed and 4 unmanaged sites) within each of which we established 4 circular plots(1000 m^2) that were used to investigate woody species, while two micro-plots(1 m×1 m) were established in each 1000-m^2 plot to analyze herbaceous species. In each sample unit, we also extracted three soil samples(0–20 cm depth) for measuring soil properties. The results indicated that the interaction between region and conservational management significantly affected the percent of canopy cover of Persian oak(Quercus brantii Linddl), soil respiration, substrate-induced respiration, as well as beta and gamma diversities and turnover of plant species. The percent of oak canopy cover was positively correlated with soil silt, electrical conductivity, available potassium, and alpha diversity, whereas it was negatively correlated with plant turnover. In addition, plant turnover was positively related to available phosphorus, while nestedness of species was positively related to organic carbon and total nitrogen. According to these results, we concluded that physical, chemical, and biological characteristics of limited ecological niche generally influenced plant diversity. Also, this study demonstrated the major contribution of the beta diversity on gamma diversity, especially in semi-arid region, because of the higher heterogeneity of vegetation in this area.

关键词： climatic conditions conservation management beta diversity oak forests physical-chemical property semi-arid region

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Spatial Variability of Soil Properties and Quality along Different Hillslope Sequences in a Protected Semiarid Oak Forest: the Role of Landscape Position and Shape

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Journal of Earth Science 2023年

作者： Javad Cheraghi Mehdi Heydari Mahmood Rostaminia reza omidipour Yahya Kooch Daniel C.Dey Department of soil and water， Faculty of Agriculture， Ilam University，Ilam， Iran Northern Research Station， USDA Forest Service Faculty of Natural Resources & Marine Sciences， Tarbiat Modares University，46417-76489 Noor， Mazandaran Department of Forest Science， Faculty of Agriculture， Ilam University，Ilam， Iran Department of Rangeland and Watershed Management， Faculty of Natural Resources and Earth Sciences， Shahrekord University，Shahrekord， Iran

Forest ecosystems can be characterized by a set of catenas arranged along the slope in mountainous areas because they affect microhabitat features that in turn influence soil properties. Heretofore， limited research has been conducted on the effects of various topographic variables on soil properties and quality in semiarid regions. This study aimed to provide important insights regarding the role of catena position and shape in determining soil properties and soil quality and their relationships in a semiarid protected oak forest in western Iran. Basic soil properties were measured in the laboratory. Finally， the soil quality index (SQI) was calculated at different topographic positions along both convex (Λ-shaped) and concave (V-shaped) catenas and by soil depths (0–15 and 15–30 cm). The findings indicated that soil organic carbon and total nitrogen declined at the lower depth in both V- and Λ-shaped catenas and at all catena positions. The lowest porosity was observed at the lower depth in toeslope positions (TS) in both catenas. Substrate-induced respiration (SIR)， microbial biomass carbon (MBC)， and basal respiration (BR) were higher in the upper depths of TS positions on V-shaped catenas compared to those on Λ-shaped catenas. The level of these biological indices was highest in the upper soil than at lower depths in all positions of both catenas. SQI had the highest values at the TS positions on both catenas and in the upper soil layer for all positions. Pearson correlations between soil properties indicated that SQI for both catenas had the highest significant positive correlation with most soil biological properties. The nutrient levels， microbial activity， and soil porosity in both catena shapes and at both soil depths displayed a relatively downward trend with increasing elevation from toeslope to summit positions. The results showed that catena toposequence shape and position affected most of the soil properties， providing evidence of the important role o

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