|Statement||M. H. El-Lakany.|
|The Physical Object|
|Pagination||72 leaves ;|
|Number of Pages||72|
Much of the area around the Chernobyl NPP was coniferous forest. Interception of radionuclides by the forest canopy resulted in high absorbed dose rates (predominantly beta‐radiation). Mass mortality of pine trees was observed over an area of ha with an estimated absorbed dose of between 60 and Gy in June (Geras'kin et al. Cited by: The sensitivity of forests is attributable to several factors, among them the greater intrinsic sensitivity of trees in general to radiation damage (certain gymnosperm are killed by as little as R, which is one-one hundredth the dose to kill certain herbs) and to the more complex structure of the forest with its concomitant reduction in the Cited by: 1. The Field-Irradiator Gamma (FIG) experiment chronically irradiated a section of the Canadian boreal forest over a period of 14 years. Forest trees were affected at dose rates > gGyh −1, but a herbaceous plant community thrived at dose rates up to 65 mGyh −ation resulted in the establishment of four zones of vegetation: a herbaceous community, a shrub community, a narrow Cited by: After cone collection the seed was extracted, and the seeds were stratified for 4 weeks before they were germinated under controlled conditions. Up to an exposure rate of r/day and for a total exposure of 16, r radiation did not affect germination. However, at an exposure rate of r/day, germination was reduced after an exposure of r.
 Amiro B D and Sheppard S C Effects of ionizing radi ation on the boreal forest: Canada’s FIG experiment, with implications for radionuclides Sci. Total Envir on. – Voles are an ideal bio-indicator to study the effects of environmental radiation in the Red Forest due to their ubiquitousness, proximity to ground (the main source of radioactive contamination) and relatively limited home range (Borowski, ). Download: Download high-res image (1MB) Download: Download full-size image; Fig. 1. The Red. A mixed stand of Pinus spp. and Quercus spp. was exposed to chronic γ irradiation over several years. Studies of megasporogenesis in both species indicated chromosome aberrations and delayed fertilization. The pine trees were more radiosensitive than the oak trees; this difference was related to differences in nuclear volume. Ionizing radiation causes water radiolysis, generating highly reactive oxygen species (ROS). ROS induce the rapid activation of detoxifying enzymes. DeoxyriboNucleic Acid (DNA) is the object of an attack by both, the hydroxyl ions and the radiation itself, thus triggering a mechanism both direct and indirect.
These effects are predominantly associated with the serious damage to the immune system of hosts caused by ionizing radiation. In addition, chronic radiation exposure can act as a mutagen that leads to the emergence of new clones in populations of pathogenic microorganisms. Ecological effects of exposure to enhanced levels of ionizing radiation Stanislav A. Geras ’ kin Russian Institute of Radiology and Agroecology, Obninsk, Kaluga Region, 2 , Russia. The strongest evidence for significant effects of ozone on crop yield comes from NCLAN studies [ 18] (fig. 8). The results show that dicotyledonous species (soybean, cotton and peanut) are more sensitive to yield loss caused by ozone than monocot species (sorghum, field corn and winter wheat). INTERNATIONAL ATOMIC ENERGY AGENCY, Effects of Ionizing Radiation on Plants and Animals at Levels Implied by Current Radiation Protection Standards, Technical Reports Series No. , IAEA, Vienna (). Download to: EdNote BibTeX *use BibTeX for Zotero.