Anvar Sanaei

Leipzig University · Systematic Botany and Functional Biodiversity

1. Quantifying plant trait variation yields insights into trade-offs inherent in the ecological strategies of plants and is the basis for a trait-based prediction of plant performance and ecosystem functioning. Although the interest in root traits has increased in recent years, we still have limited knowledge of i) whether functionally discrete fin...

Climate extremes in tandem with biodiversity change affect plant emissions of biogenic volatile organic compounds, as a result, the formation of biogenic secondary organic aerosols. The resulting biogenic secondary organic aerosols can have a wide variety of impacts, such as on Earth's radiative balance or cloud-and precipitation formation. However...

Climate extremes in tandem with biodiversity change affect emissions of biogenic volatile organic compounds (BVOCs) from plants and, as a result, the formation of biogenic secondary organic aerosols (BSOA). The resulting BSOA can have a wide variety of impacts, such as on Earth′s radiative balance and cloud formation. However, it is unclear to what...

Plant diversity supports multiple ecosystem functions, including carbon sequestration. Recent shifts in plant diversity in rangelands due to increased grazing pressure and climate changes have the potential to impact the sequestration of carbon in arid to semi‐humid regions worldwide. However, plant diversity, grazing intensity and carbon storage a...

Tree canopies are considered to effectively buffer climate extremes and to mitigate climate change effects. Droughts, which are predicted to become more frequent in the course of climate change, might alter the microclimatic cooling potential of trees. However, our understanding of how microclimate at the tree canopy level is modulated by environme...

Biocrusts are multifaceted communities including mosses, lichens, and cyanobacteria that are crucial for sustaining soil functions in drylands. Most studies on biocrust functions to date have focused on biocrust cover and development, largely in non‐saline soils, and we know very little about the importance of biocrust diversity for maintaining mul...

Data capturing multiple axes of tree size and shape, such as a tree's stem diameter, height and crown size, underpin a wide range of ecological research - from developing and testing theory on forest structure and dynamics, to estimating forest carbon stocks and their uncertainties, and integrating remote sensing imagery into forest monitoring prog...

Soil’s water-physical properties support essential soil water retention functions for driving water distribution and availability, which is vital for plant growth and biogeochemical cycling. However, the question concerning how tree compositions and their interactions with other abiotic factors modulate soil’s water-physical properties in disturbed...

Regional factors, such as historical and contemporary climate conditions, and local factors, such as vegetation structural attributes, can influence current patterns of plant species richness but their relative roles remain unknown, particularly across forest strata. Here, we used a multi-scale survey of temperate forest plots across a large region...

Aims Understanding fine-grain diversity patterns across large spatial extents is fundamental for macroecological research and biodiversity conservation. Using the GrassPlot database, we provide benchmarks of fine-grain richness values of Palaearctic open habitats for vascular plants, bryophytes, lichens and complete vegetation (i.e., the sum of the...

Grazing can alter plant species interactions in natural rangelands, which in turn might influence the productivity of the ecosystem but we do not fully understand how spatial variability in plant diversity-biomass relationships are modulated by grazing intensity. Here, we hypothesized that plant species co-occurrence in rangelands is mainly driven...

It is generally well-explored that overstorey stratum regulates understorey stratum through the dominant role over the available resources in forests. However, the relationships amongst topography, soil nutrients, species diversity, tree-size dimension inequality and aboveground carbon (AGC) stock across forest strata remain debated in forest ecosy...

Interactions between plants and soil microbial communities underpin soil processes and forest ecosystem function, but the links between tree diversity and soil microbial diversity are poorly characterized. Differences in both the taxonomic and functional diversity of trees and microbes can shape soil nutrient status and carbon storage, but the stoi...

The plant-soil interactions may drive the diversity and functioning of forests, but we do not fully understand how interrelationships between plant and soil compartments are underlined by multiple ecological mechanisms. Here, we hypothesize that positive plant-soil interactions enhance biodiversity and functioning in a temperate forest. To do so, w...

Biodiversity plays a fundamental role in provisioning and regulating forest ecosystem functions and services. Above‐ground (plants) and below‐ground (soil microbes) biodiversity could have asynchronous change paces to human‐driven land‐use impacts. Yet, we know very little how they affect the provision of multiple forest functions related to carbon...

Greater variation in stand structure (i.e., individual tree size variation and stand density) is thought to promote aboveground biomass (AGB) better than species richness due to the canopy packing by different sized trees in the forest community. Here, we hypothesized that the relationships amongst species richness, stand density, individual tree s...

Background and aims Soil water storage capacity acts as a vital forest function to intercept rainfall and retain water for plant growth processes. However, whether or how plant functional trait diversity and composition regulate soil water storage capacity remains poorly understood. Methods Structural equation modeling (SEM) was used to detect the...

High species diversity is generally thought to be a requirement for sustaining forest multifunctionality. However, the degree to which the relationship between species-, structural-, and trait-diversity of forests and multifunctionality depend on the context (such as stand age or abiotic conditions) is not well studied. Here, we hypothesized that c...

Large trees, as the versatile provider of ecosystem services, are the most susceptible to episodic disturbance regimes such as extreme climate and biotic agents across the globe, and hence, largely determine forest demographic processes. Despite the recognized fundamental ecological significance of large-diameter trees to above-ground biomass (AGB)...

Strong competitor (i.e. big-sized) trees are globally crucial for promoting aboveground biomass. Still, we do not fully understand the simultaneous influences of different levels of competitor (i.e. strong, moderate, medium and weak) trees at stand level in shaping forest diversity and biomass along a climatic gradient. We hypothesized that few str...

The macro-ecological mechanisms underlying species diversity and productivity are not mutually exclusive, but our understanding is limited to the climatic variation in species richness and productivity along ecogeographical gradients. Yet, the ecogeographical gradients in a few large-diameter trees are not clearly tested on the linkage amongst fore...

Understanding the impacts of multiple climatic and edaphic factors on forest diversity, structure and biomass is crucial to predicting how forests will react to global environmental change. Here, we addressed how do forest structural attributes (i.e. top 1% big, top 25% big medium and small trees; in terms of tree height, diameter, and crown), spec...

Topography, grazing disturbances, and soil textures are the main determining factors of natural herbaceous plant communities. Yet, while interesting efforts have been made to link topography, soil conditions, grazing disturbances, species diversity and aboveground biomass, we still lack a comprehensive understanding of how soil textural properties...

Biodiversity–productivity relationships have widely been studied in natural herbaceous communities but remain debated. Here, we hypothesized that species richness of perennial plants would increase species richness of annual plants but aboveground biomass of perennial plants would restrict the species richness and aboveground biomass of annual plan...

Background: Discrepancies in the shape of the productivity-diversity relationship may arise from differences in spatial scale. We hypothesised that there is a grain size effect on the productivity-diversity relationship. Aims: To determine the effect of three sampling grain sizes on the productivity- diversity relationship. Methods: We applied gen...

Aims The accurate estimation of aboveground biomass in vegetation is critical for global carbon accounting. Regression models provide an easy estimation of aboveground biomass at large spatial and temporal scales. Yet, only few prediction models are available for aboveground biomass in rangelands, as compared to forests. In addition to the developm...

The positive relationships between biodiversity and aboveground biomass are important for biodiversity conservation and greater ecosystem functioning and services that humans depend on. However, the interaction effects of plant coverage and biodiversity on aboveground biomass across plant growth forms (shrubs, forbs and grasses) in natural rangelan...

Rangelands play an important role in the biodiversity conservation and ecosystem functions. Yet, few studies have assessed the effects of biotic and abiotic factors on aboveground biomass across plant growth forms and at whole-community level in rangelands. Here, we hypothesized that aboveground biomass is driven by both biotic (plant coverage, spe...

Rangelands are one of the most important and valuable national resources, that their proper utilization with improvement and restoration has a fundamental role to maintain soil, water and supply needs of protein products for people. For proper management of rangeland ecosystems, all of the factors affecting these ecosystems should be understood and...

Natural resources, as the basis of life and sustainable development, play a vital role in creating job and securing beneficiaries livelihood. Hence natural resources preservation, development, and rehabilitation should be prioritized. In this paper, probable consequences of targeted subsidies on the natural resources using analysis of statistics an...

The aim of this study was to evaluate the effects of grazing intensity around water resources on vegetation characteristics. For arrive this goal, three water points selected in the Silve watershed of Piranshahr rangelands. Around of each water point two regions with 0-150 and 150-300 meter intervals separated. In the four geographical direction an...

Rangelands as bed life and ecosystem pillars play important role in human life. Various solutions are presented to propel sustainable protection of natural resources especially rangelands and people participation is emphasized. High level of social capital leads in better participation and successful collaborative programs. In this research social...

Today, as the focus of watershed planning and management for sustainable development in many of the issues. Ecological watersheds can be evaluated and ranked them according to various ecological criteria for the watershed, one of the important steps in the planning and management of watersheds. Since the cost of watershed management projects and he...

Chemical assessments of forage clearly determine the forage quality; however, traditional methods of analysis are somehow time consuming, costly, and technically demanding. Near Infrared Reflectance Spectroscopy (NIRS) has been reported as a method for evaluating chemical composition of agriculture products, food, and forage and has several advanta...

The present research was conducted to specify instruction potential to classification of goat grazing suitability using GIS multicriteria evaluation in middle Taleghan rangelands. Within this research we use three criteria including vegetation, water sources and soil erosion as input of decision making model. Vegetation sampling was carried out in...

Statistics were not required in the absence of erosion and sediment delivery(SDR) and deposition in the watershed basin of Iran is considered the most important problems, Actually hinder the proper planning, especially for the preparation and implementation of watershed management plans are. Determine any areas of erosion and deposition as one of t...

افت آبهاي زيرزميني از يک سو و تخريب کيفيت اين منابع خدادادي از سوي ديگر، اهميت مطالعات آن را دو چندان مي¬کند. بررسي آلودگي آبهاي زيرزميني در شناخت وضعيت کيفي، منابع آلوده کننده و تعيين مناسب¬ترين راهکارهاي مديريتي از اهميت ويژه¬اي برخوردار است. بنابراين مطالعه كمي و كيفي آبهای زیرزمینی جهت بهره برداري مناسب و مديريت بهينه ضروري است. در اين تحقيق با...

فرسايش و هدررفت خاك يكي از عوامل اصلي در كاهش حاصلخيزي خاك، كاهش محصول ، رسوب مواد در آبراهه‌ها،کانال‌های آبياري و رودخانه‌ها، كاهش ظرفيت مخازن سدها و كاهش عمر آن‌ها می‌شود. تخمين مقدار رسوبدهي حوزه هاي آبخيز، مقابله با خطرات ناشي از تجمع رسوب در سازه هاي آبي و مخازن سدها از اهداف اساسي در مديريت منابع آب می‌باشد که باعث توسعه پایدار می¬شود. اين تح...

از آنجایی که در حال حاضر به دلیل عدم شناخت شاخص ها و معیارهای گردشگری جهت برنامه ریزی و مدیریت و تعیین مکانهای مناسب برای گردشگری کاستی هایی وجود دارد، تحقیق حاضر برای ارزیابی و اولویت بندی عوامل مؤثر در گردشگری با استفاده از تحلیل سلسله مراتبی (AHP) انجام شد. جهت این امر به تعداد 20 پرسشنامه در بین کارشناسان و مردم پخش شد و عوامل و معیارهای اصلی ش...

مدیریت حوزه¬های آبخیز یا همان آبخیزداری امروزه به عنوان یک رویکرد جدید و یک پارادایم در راستای برنامه¬ریزی، توسعه و مدیریت مناسب اراضی، مدیریت منابع آب و پوشش گیاهی با تاکید ویژه بر مسائل اقتصادی و اجتماعی و زیست محیطی مطرح می‌باشد که بدنبال ایجاد راهکارهای مشارکتی در این عرصه‌ها است و توسعه پایدار را دنبال می¬کند. فلسفه وجودی مدیریت حوزه¬های آبخیز...

اکتشاف و شناسایی دریاها سبب شده است که فرآورده های بسیاری در منازل انسانها به ارمغان آورده شود. یکی از این فرآورده ها جلبکها هستند که به زندگی روزانه بشر بدون آنکه متوجه نقش آن باشیم، فوائد بسیاری می رسانند. اهمیت جلبکها در عرصه کشاورزی و صنعتی بسیار حائز اهمیت می باشد و در کنار آن به عنوان یک ماده غذایی انسانی، دارویی و علوفه دامی و نیز در ساخت ان...

هدف از این مطالعه ارزیابی تغییرات ایجاد شده در اثر شدت چرا در خصوصیات سطحی خاک اطراف منابع آب می¬باشد. جهت این امر سه آبشخوار با فواصل متفاوت از روستا در مراتع حوزه آبخیز سیلوه واقع در شهرستان پیرانشهر انتخاب و در اطراف این منابع آب دو منطقه به فواصل 150-0 و 300-150 متری جدا شد و نمونه بردای خصوصیات سطحی خاک اعم از درصد پوشش لاشبرگ، سنگ و سنگریزه و...

To adjust relation between human and the nature according to its potentials, one of the most important goals is determine of rangeland utilization suitability. The present study was done in order to determine the ability of instruction for suitability classification of medical and industrial plant growing in middle Taleghan rangelands, Iran. To ach...

Every range species has given yield in different grazing season and years. Also individual livestock's consume given forage in each temporal and spatial scale of grazing season. It is impossible to planning and managing livestock and rangeland in case of no knowledge of plants yield and consumption characteristics. Asrtagalus effusus serves as one...

The present research was conducted to specify instruction potential to classification of goat grazing suitability using GIS multicriteria evaluation in middle Taleghan rangelands. Within this research we use three criteria including vegetation, water sources and soil erosion as input of decision making model. Vegetation sampling was carried out in...

Nowadays, groundwater resources management plays vital role in arid and semi-arid regions. That’s why, applying some methods to clear their conditions, is necessary. To evaluate spatial variations of groundwater qualitative models has a great deal of importance to realize water table quality, contaminant resources and finally determining the best m...

تعيين كيفيت علوفه گياهان مرتعي و همچنين مشخص نمودن ظرفيت چرايي مرتع در امر مديريت صحيح و اصولي مراتع و ايجاد تعادل پايدار بين دام و مرتع بسيار حائز اهميت مي¬باشد. گونه ¬هاي گياهي مختلف داراي ارزش غذايي متفاوتي مي¬باشند. روشهای مختلفی برای اندازه گیری کیفیت و ارزش غذایی علوفه وجود دارد. استفاده از روش¬های معمول جهت تعیین کیفیت علوفه زمان¬بر و پرهزین...

Determination of forage quality of available species is one of the fundamental factors for the management of rangelands. Near-Infrared Reflectance Spectroscopy (NIRS) was used to analysis the Nitrogen (N), Acid Detergent Fiber (ADF), Dry Matter Digestibility (DMD) and Metabolizable Energy (ME) content of three phenological stages (vegetative, flowe...

تعیین کیفیت علوفه گیاهان مرتعی و همچنین مشخص نمودن ظرفیت چرایی مرتع در امر مدیریت صحیح و اصولی مراتع و ایجاد تعادل پایدار بین دام و مرتع بسیار حائز اهمیت می‌باشد. گونه‌های گیاهی مختلف دارای ارزش غذایی متفاوتی می‌باشند. ارزش غذایی علوفه اغلب براساس محتوای ترکیبات شیمیایی برآورد شده است. به همین منظور در تحقیق حاضر ارزش غذایی دو گونه Festuca avina و...

ارزیابی تناسب اراضی عبارتست از مطابقت کردن مشخصات نوع مخصوصی از اراضی با یکی از انواع استفاده‌های مورد نظر، چنانچه مشخصاتی از اراضی با نیازمندی‌های نوع بخصوصی از کاربری‌ها مطابقت نماید میزان محدودیت ایجاد شده مشخص و بر اساس آن درجه تناسب اراضی برای آن نوع استفاده تعیین می‌گردد. در بررسی قابلیت اراضی منطقه طالین که مساحت آن 15/1372 هکتار است جهت است...

آگاهی از کیفیت علوفه و تغییرات آن در مناطق مختلف آب و هوایی و در مراحل مختلف فنولوژیکی از موارد اساسی تعیین میزان علوفه مورد نیاز دام برای محاسبه و تعیین ظرفیت چرایی مرتع در طرح‌های مرتع‌داری است. استفاده از روش‌های معمول جهت تعیین کیفیت علوفه زمان‌بر و پرهزینه است و برای تجزیه و تحلیل روزمره مناسب نیست. هدف از این مطالعه ارزیابی پتانسیل عملکرد دست...

The study presents a model for quantitative, qualitative and spatial distance assessment of water sources suitability for livestock grazing based on geographic information systems (GIS). The research was carried out on rangelands of Piranshahr in West Azerbaijan Province, Iran, in 2011. The framework of the study was based on FAO method for land ev...

The effects of Range Management Plans (RMP) on soil and vegetation characteristics were studied in Eshtehard rangelands at Alborz province. The parameters of yield, canopy cover, range condition and trend, bulk density, Organic Matter (OM%), Nitrogen (N), Phosphorous (P) and Potassium (K) were estimated on soil samples in sites of Ghenzel Cheshmeh...

Generally, Flood study is done to ensure of water structures safe, providing the river engineering and flood control programs and primary assessment of diversion facilities and water storage also. Therefore Design of these structures is done, based on the maximum instantaneous discharge for different return periods per and the importance of struct...