Since density is considered as one of the most important numerical indices to explain quantitative values of a plant community by affecting on many aspects and activity of ecosystem, on the other hand, awareness about plants distribution pattern in environment is an essential preparation for measurement and study of vegetative cover, therefore, in this research determination of density and dist...

Purpose. To evaluate the quality indicators of spring barley seeds grown under different soil and climatic conditions. Methods. Laboratory, calculation statistical methods were used during research, analysis synthesis to draw conclusions. Results. As a result dependence indicators, namely: grain uniformity protein content, on zones growing conditions was revealed. Thus, ranged from 86.7% (high,...

Purpose. To estimate the ecological plasticity of common millet yield under conditions Steppe, Forest-Steppe and Forest Ukraine. Methods. Mathematical statistical: determination stability by Eberhart & Russell method, correlation analysis. Results. As a result analysis cultivated areas during period 2011–2020, it was revealed that in Ukraine depend on world ones (r = 0.34). It determined hi...

Many recent studies have focused on the relationship between biodiversity and ecosystem functioning, such as investigations into the productivity of experimental plant communities. One of the central issues affecting the functioning of ecosystems is the diversity of resident species richness and the composition of the plant community. However, one challenge to experimental studies is that resul...

The relationship between species richness (SR) and aboveground net primary productivity (ANPP) is still a central and debated issue in community ecology. Previous studies have often emphasized the relationship of alpha diversity (number of species identity) to the mean ANPP with respect to the SR-ANPP relationship while neglecting the contribution of beta diversity (dissimilarity in species com...

Sediment cores from Carp Lake provide a pollen record of the last ca. 125,000 years that helps disclose vegetational and climatic conditions from the present day to the previous interglaciation (120–133 ka). The core also contained 15 tephra layers, which were characterised by electron-microprobe analysis of volcanic glass shards. Identified tephra include Mount St. Helens Ye, 3.69 ka; Mazama a...

Aim. To investigate the variability of alpha-amylase isoenzymes in soft wheat varieties Ukrainian selection, created by breeding institutions located different climatic zones (Forest Steppe and Steppe). Methods. Isoenzymes were detected electrophoretic protein separation a polyacrylamide gel. The fall number on «Falling Number 1700» was determined. Results. For representative assessment distrib...

historical records of cheatgrass Bromus tectorum invasion in North American sagebrush-steppe Sumanta Bagchi*, David D. Briske, Brandon T. Bestelmeyer and X. Ben Wu Department of Ecosystem Science and Management, Texas A&M University, 2138 TAMU, College Station, TX 77843, USA; USDA-ARS, Jornada Experimental Range and Jornada Basin LTER, New Mexico State University, MSC 3JER, Box 30003, Las Cruce...

The fourth instar larva of Dasyhelea mediomunda Minaya is described for the first time and a complete description of the pupa is provided, through use of phase-contrast microscope and scanning electron microscope. Studied specimens were collected in a pond connected to a small wetland "mallin" on the Patagonian steppe, Chubut province, Argentina.

in semiarid regions such as saida, the steppe ecosystem is currently submitted to desertification under the combined effect of human activity and climate change. our study is a contribution to the assessment of the biodiversity of steppe formations through a phytoecological diagnosis at the south zone of the wilaya of saida. to achieve the objective of this study, a methodological approach base...