Plant diversity is affected by spatial variables as well soil physical and chemical variables. In this study, plant species were investigated in five sites of Tabuk Province (Saudi Arabia), namely Aldesah, Alzetah, Alawz, Harra Sharma, to understand if the spatially structured (pH, electric conductivity (EC), texture, calcium, potassium, phosphorus, phosphate, total organic matter (OM), bicarbo...

assessment of diversity and species richness in the understanding of ecosystem functions, protect and preserve genetic resources, evaluation and control of environmental change and the success or failure will help natural resource management programs. arbitrary banning livestock grazing program and one of the most common and perhaps the most degraded pastures and reduced the diversity and speci...

biodiversity refers to all forms of living animals, plants and microorganisms and agro-biodiversity is a component of biodiversity that represents diversity in arable lands. the aim of this study was to determine the biodiversity status of agro-ecosystems of shahr-e-rey city located in south of tehran, through calculating species richness index using rarefaction method. to the collect required ...

 Benthic invertebrates are a well-established target in environmental quality status evaluations. The AMBI (AZTI's Marine Biotic Index) was developed to determine the impacts and the quality status of soft-bottom marine benthic communities. The aim of this study was investigating multivariate pattern of benthic invertebrate community and application of AMBI (AZTI's Marine Biotic Index) for...

The in-situ photosynthetic activity in tropical intertidal benthic diatom response to environmental variation was assessed this study by measuring chlorophyll fluorescence. investigation carried out during the lowest tide January (non-rainy day) and February 2013 (post-rainy at two sampling sites (A B) from each selected location (Pantai Jerejak, Teluk Bahang Tanjung Bungah, Pulau Pinang, Malay...

biodiversity plays a crucial role in stability and productivity of natural ecosystem. the main goal of this research was to classify ecological groups in steppe rangeland and investigate their relationships with plant diversity indices. therefore, fifty different land unit tracts (lut) were identified in khod-neuk basin, yazd province, iran, in 2010. vegetation and soil samples were taken in th...

Here, I address two other problems raised by this article. A review of published experimental results led the authors to conclude that “diversity enhanced ecosystem stability”, where this is defined as “the ability to withstand recurrent perturbations”. This curious statement reverses modern theory of ecological diversity in the ocean as discussed, for instance, by Ramón Margalef. Ecosystems of...