Negar Ahmadian

Negar Ahmadian
Tarbiat Modares University | TMU · Department of Range Science

Ph.D Student

About

13
Publications
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Citations

Publications

Publications (13)
Article
Full-text available
Research in global change ecology relies heavily on global climatic grids derived from estimates of air temperature in open areas at around 2 m above the ground. These climatic grids do not reflect conditions below vegetation canopies and near the ground surface, where critical ecosystem functions occur and most terrestrial species reside. Here, we...
Article
In this study, we aim to evaluate the diversity of vascular plants and lichens coexisting in Artemisia sieberi dominated landscapes of northern Iran. Specifically, we wanted to unveil to what extent Artemisia plant cover and soil features affected species diversity and composition of annuals and lichens growing beneath them, and if annual plants an...
Article
Biological soil crusts (BSC) play a crucial role in arid ecosystem functioning, yet the effect of their properties (e.g. whether they are dominated by mosses and lichens) on the germination has rarely been investigated. Here, we analysed the effects of intact, dead and removed moss or lichen BSC on seed germination of Stipa caucasica, a key species...
Preprint
Full-text available
Research in environmental science relies heavily on global climatic grids derived from estimates of air temperature at around 2 meter above ground1-3. These climatic grids however fail to reflect conditions near and below the soil surface, where critical ecosystem functions such as soil carbon storage are controlled and most biodiversity resides4-8...
Article
A water-soluble polysaccharide was isolated from Tornabea scutellifera and fractionated using a DAEA Sepharose FF column to evaluate its capacity to stimulate natural killer (NK) cells and macrophages. Neutral sugars (71.8–93.5%) constituted the major part of crude polysaccharides and fractions (TSF 1 and TSF 2 ) with relatively lower levels of pro...
Article
Full-text available
Abstract 1- INTRODUCTION Soil erosion is one of the most destructive processes of arid and semi-arid areas, which leads to desertification in a large area of the region. In windy areas, the wind in the region increases the probability of wind erosion. Soil moisture and soil temperature are the two effective factors in soil erosion control. Vegetati...
Article
Full-text available
Abstract Biological soil crusts greatly affect the surface properties of the soil, which in turn may also alter the germination of the seeds of vascular plants. The aim of this study was to investigate the effect of moss on germination of five dominant species of Golestan National Park. At the beginning of the experiment, the seeds of five dominant...
Article
Full-text available
Patchy vegetation is the main characteristic of arid and semi-arid lands. Gaps between patches in some cases are covered with biological soil crust such as lichens and these crusts have important ecological roles such as influence on germination and plant survival. In this research, effects of lichens as an important biological crust on the germina...

Questions

Question (1)
Question
It would be my pleasure to have your advice for instruments and facilities in plant ecophysiology lab. We are working  mainly on wild species from rangelands and forests in aridlands.  Some photosynthsis, anzymes and leaf  chemical physiological traits would be favorate parameters. It would be nice if you intrdouce the model of instruments as well.
Warm regards, Negar

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Projects

Projects (2)
Project
- Influence of BSC on seed germination and species establishment - BSc and soil seed bank potential in rangeland restoration - Lichen functional diversity in arid steppes - Microlimate modifications by BSC - Soil quality variations in lichens, moss and cyanobacters crust - Interactions of Artemisia shrubs and moss
Project
Goal: 1- Diversity of habitats in connection to Biological Soil Crust of Iranian arid and semi arid environments 2- Taxonomic composition and species diverse in connection to BSC itself. 3- BSC value in connection to biological indicators of soil health 4- Biological soil crusts structure function and management 5 -Bioindicator Species in BSCs composition and their use in biomonitoring of Iranian Rangelands 6-Biological soil crusts as indicator of overgrazing 7-Biological Soil Crusts and Wind Erosion 8-Biological soil crusts of Iran: their diversity, functional ecology and management