This paper includes the results of researches as concern the state of representative ecosystems in river Prut basin and the proposals of their valorification. The state of ecosystems is in dependence of economic activities, clime, self-purification capacity of water, air, soils and shows that in Tetcani and Trinca forest ecosystems it is aerian pollution also in Criva and Chetrosica Noua forests; water of river Prut tributaries contain 57-89% of stable organic substances and 11-43% of readily biodegradable ones. The higher self-purification capacity it will be possible through the increasing of hydrological representative ecosystems areas. Investigations of Briceni and Trebisauti soil resources denote the presence As and Pb in content higher than admissible level.The study of external gamma radiation fond remarks the variation from 12 till 20 μR/h. Radiospectrometric analysis show that in natural biocenozes Brătuşeni, Edineţ, Briceni and Trebisauti Cs-137 maximal concentration is in 0 – 3 cm (44 - 48 Bq/kg) sol level of forest in comparison with 4,6 - 6,8 Bq/kg in superior horizon of arable territory. In arable soils it was establish a migration of Cs-137 till depth more than 50 cm.