Russian Journal of Biological Research

14-30

Authors: Nikolay A. Bityukov

The article features a geoecological survey of the durmast oak in the Black Sea Caucuses. The method of forest vegetation monitoring was used. This method was applied at the minor pair watersheds, where one was subjected to experimental cutting and the other served as a controller. According to the materials of monitoring, the analysis on year-to-year accretion of oak wood was conducted. The dynamic of natural regeneration of the durmast oak after fires has been analyzed. Due to the forest management, the dynamic of forest litter of natural plants has been analyzed.

38-45

Authors: Marzieh Negahban, Sajedeh Saeedfar, Darioush Ramezan, Moazzam Hassanpour Asil

Salinity is one of the most important factors limiting growth and development in cultivated species. Kentucky bluegrass was grown in boxes filled with sand (100%), 95% sand: 5% zeolite, 90% sand: 10 % zeolite and 85% sand 15% zeolite (V/V). Poa pratensis plants were irrigated with 0.24, 3.4 and 6.4 dS.m-1 salt water daily for 6 months in greenhouse condition to study the effect of different levels of zeolite on turf quality (TQ) and some physiological growth factors, salt deposition, sodium absorption ratio (SAR) and ion composition in leachate under different levels of salinity. Saline water reduced (PR), transpiration, (SC), (ME), (WUE), maximum assimilation rate (Amax), carboxylation efficiency (g, m) and net assimilation rate (A360) compared to control. Amendment of sand with zeolite increased TQ, PR, transpiration, SC, ME, WUE, (Amax), (g, m) and (A360) during both the 2nd & 3rd months at both salinity levels. Highest effect obtained in highest percent of zeolite. The beneficial effects of zeolite on turf quality and other parameters diminished 3 months after treatments. Amendment of sand with zeolite reduced leaching of Na and K but, increased leaching of Ca and Mg. Using zeolite in medium increased SAR value compared to control. Results indicate that amending with zeolite may buffer soil solution Na concentration in short-term. In the long-term, however, a substantial amount of Na may be retained concurrent with Ca & Mg exchange, thereby increasing sodicity & salinity problems.

69-72

Authors: Guzaliya Z. Samigullina

The article analyzes environmentally sound technologies for assessment of waste toxicity in dairy industry. The efficiency of the biotesting as a method of assessing the quality of wastewater treatment. Case study: JSC "Glazov-moloko" Kipryatsky Milk Reception Station. The authors suggested a technological solution for wastewater treatment at the Kipryatinsky Milk Reception Station.