Several evenness measures have been proposed for quantifying the distribution of abundance among community species, but none seems to be generally preferred. Since these measures have the common objective of summarizing community structure, they may be expected to be intercorrelated. In this paper, seven standard measures of evenness were calculated for 65 sample plots of ruderal vegetation wit...

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...

Understanding patterns in forest communities and its driving factors play a critical role ecological studies. In view of this, present study attempts to understand the environmental anthropogenic towards shaping species diversity composition along altitudinal gradient (700–3800 m asl) Indian western Himalaya. A total 51 tree (28 families) were recorded; Pinaceae (5) Fagaceae rich families. ?-di...

Species diversity is a crucial index used to evaluate the stability and complexity of forest ecosystems. Studying relationship between stand structure understory herbaceous plants species useful for managers formulate best optimization method with goal improving diversity. In this research, Platycladus orientalis plantations in Beijing were taken as research object. Pearson’s correlation analys...

In order to quantify the plant species diversity characteristics of Pinus massoniana plantations with different stand densities in Danjiangkou reservoir area Hubei Province and relationship their trade-offs synergies water retention capacity give full play forest ecosystem services improve level sustainable management plantations, we used typical plot method, selected 35-year-old low density (9...

Although sustainable forestry methods such as Reduced Impact Logging (RIL) have lower impacts on biodiversity compared to conventional logging, the direct and indirect effects of RIL are poorly understood. Additionally, studies focusing specific habitats may fail detect cross-habitat impact variation or effect taxa which utilize multiple habitats, i.e. amphibians. We therefore investigated resp...

Grasslands in the Altay Mountains are main part of grassland ecosystem Xinjiang, and spatial distribution patterns species diversity biomass have changed significantly due to combined effects climate change anthropogenic disturbances. To clarify point factors on biomass, this study investigated vegetation status 41 sample plots grasslands forest area. The Margalef richness index, Simpson domina...

Importance of fish species in the benthal ichthyocoenoses (up to depths 2000 m) is discussed for Russian waters Far-Eastern Seas and adjacent North-West Pacific on data bottom trawl surveys conducted by Fish. Res. Inst. (TINRO) 1977–2010. The inverse Simpson index (or polydominance index) was chosen as a measure dominance; Sorensen-Chekanovsky similarity used comparative analysis dominance stru...