Survival,growth and photochemical efficiency of silver fir seedlings produced with different technologies

New Forests - Forest tree seedling production technologies impact reforestation success determined with survival and quality of seedlings. Five Abies alba seedling production technologies were...     

Analysis of genotype-by-environment interaction in a multisite progeny test with Scots pine for supporting selection decisions

European Journal of Forest Research - In multisite forest genetic experiments, the presence of genotype?×?environment interaction (GEI) is common. GEI may negatively affect the...     

Features of cryogenic environment in soils of continental tundra and arid steppe on the southern Khangai slope under electron microscope

Morphoscopic studies were conducted with the aid of SEM and TEM microscopes, on quartz grains and fractions not exceeding 2 μm, on soil samples from the continental tundra, alpine meadow and arid steppe. The aim of these studies was to define the features and properties of the quartz grains and fractions, produced by the environment of the cryoarid continental climate of Central Asia. It has been established that in cold and humid climates processes of cryogenic and hydrothermic splitting occur on the surface of quartz grains and in cold and dry climates processes of cryothermic scalling. The increase in the surface area of disintegrated minerals under continental climate conditions is accompanied by cryochemical coating by mineral-organic compounds.     

Survival rate of tree and shrub seedlings under extreme environmental nitrogen pollution

In 1966 and 1967 a N fertilizer plant started to operate in a large complex of pine plantations. In the dominant Vaccinio-myrtilli Pinetum Forest, plants were dying at a high rate. By 1983, acute desertification had occurred within 1.7 km of the emitter. In 1972, in the immediate surrounding of the emitter, there was a 22- to 35-fold increase in the content of mineral N in the organic horizon, and an 11-fold increase in the mineral horizons of podzolic brown earth soils. From 1972 to 1982, a stationary study was performed on the dynamics of soil properties to a depth of 4 m at 3 points distributed in the direction of prevailing winds over the distance of 2.5 km from the emitter. At the same time, from 1972 to 1983, a field study' was carried out on the reaction and relative resistance of seedlings of 19 tree and 13 shrub species to the continued high N pollution. In the second year after planting, a significant difference in survival rate of tree and shrub species was observed. Survival tendency can be arranged in 4 groups:(1) not surviving, (2) surviving a short period, about 5 to 8 yr, (3) surviving a longer period, about 12 yr, and (4) long survival - more than 12 yr. Peat added to the soil increased survival by 10 to 20%.