"measurments" - 1 õppematerjal

ÕHUSAASTE MÕJU UURIMINE PUUDE KASVULE KIRDE EESTI RABADES

Measurements were made by LINTAB instrument and TSAPWin program. Samples were taken by drilling through the tree in two crossing sections. The samples were analysed in TSAPWin and Excel programs. Study shows that bog pines largest radial growth in bogs occur during 1962-1990. Named period ic characteristic for Puhatu and Kõrgesoo bog. In Selisoo the period of largest growth is shorter and began later. The main finding is similar to the measurments made earlier. Increase in radial growth is well associated with highest use of oil shale during the same period. The emission load decrease during last decades is clearly seen in our samples - yearly growth has dropped several times. The largest change occur in Kõrgesoo bog, where the yearly growth has reached the same level as before the year 1960. In Puhatu the growth decrease has been smaller and smoother, not yet reaching earlier level. Similarly to the