2. at about the same slope (19～22°), the quantity of soil loss is farming land (2 312 t/km~2)>grass land removing from plough (981t/km~2)>closed slope(67t/km~2) >slope land with vegetation(19~24t/km~2);
The results indicate that,from 1985 to 1997,the per growth rate of value added of farming,forestry,animal husbandry and fishery is 15.5%,the average contrtibutive rate of farming is 53.22%,forestry being 4.94% animal husbandry 30.17%,and fishery 11.67%.
The average contents of water,organic carbon and sulfide in sediment in cage fish farming area were 60.5%,2.82% and 562 mg·kg-1,respectively,all higher than those in the control area(55.8%,2.42% and 238 mg·kg-1,respectively)significantly(P<0.05);
Increased vegetation cover and change in farming techniques were suggested to prevent and control wind erosion of sand and soil.
The species composition and population densities of foraminifera were studied in scallop farming grounds in Alekseev Bight (Amurskii Bay, Sea of Japan).
When the scallop mariculture farm was in operation, the species composition of foraminifera in farming grounds was impoverished and their population densities were an order of magnitude lower than at more distant locations.
Between 1988 and 1995, after the liquidation of the farm, the species diversity and population density of foraminifera in farming grounds increased, while there was a general decline of the foraminifera population in the bay.
The contribution of the Yama population to the gene pool of the Ola chum salmon, (both by natural reproduction and by farming) is small in spite of many large-scale transplantations.