-9999

250

26

-9999

4,8 arba <1,5-1,9 arba <0,99

not relevant

µg N/l

µg P/l

not relevant

μg/l

insufficient data

insufficient data

Insufficient data.

Insufficient data.

Insufficient data.

Summarizing the change in eutrophication indicators in Lithuania, it is obvious that the state of the environment is not good according to most eutrophication indicators. The multi-annual trends in these indicators are quite contradictory and seem to reflect the climatic fluctuations that characterize the region. It is also important that the amount of total nitrogen and total phosphorus entering the Baltic Sea from the territory of Lithuania makes up only about 4% of the total amount of nutrients. Thus, even the influence of the largest Lithuanian river, the Nemunas, on the eutrophication process is mostly observed only in the coastal zone north of Klaipeda.

The runoff of the Nemunas River makes up over 85% of all nitrogen of river origin entering the Lithuanian Baltic Sea area. According to long-term research data, on average, over 40.0 thousand people enter the Baltic Sea on the Nemunas per year. T total nitrogen. A comparison of the inflow of the Nemunas with the instantaneous amounts of total nitrogen and total phosphorus in the whole water area of the Baltic Sea Region of Lithuania (94.3 thousand T N) shows that the N inflow is significant and makes up about 43% of the total amount. Other sources. A significant part of the total nitrogen input, up to 10%, is accounted for by atmospheric precipitation. Meanwhile, other secondary - point sources, runoff of small rivers amount to up to 3 thousand. Tons. The total annual load is just over 50 thousand tons of nitrogen per year.

The results of the monitoring of the last decade show that the average concentrations of total nitrogen in the part of the Baltic Sea belonging to Lithuania in winter are decreasing, although the trends of mineral nitrogen concentrations are not clear. The average concentrations of mineral nitrogen were determined in the zone of the northern stony coast and in the zone of influence of the Curonian Lagoon (average during the period from 1992 to 0.280 mg / l). The northern rocky coastal zone is characterized by higher concentrations of mineral nitrogen than the southern sandy coast. On the other hand, changes in mineral nitrogen concentrations and peak values in winter on the northern rocky coast since 2000. increased.

The runoff of the Nemunas River makes up over 90% of the total phosphorus of river origin entering the Lithuanian Baltic Sea area. According to the data of multi-year surveys, on average, about 2.0 thousand. T of total phosphorus. A comparison of the inflow of the Nemunas with the instantaneous amounts of total total phosphorus in the entire water area of the Baltic Sea Region of Lithuania (8.5 thousand T P) shows that the P inflow accounts for only one fifth (about 21%) of the total amount. Other sources of total phosphorus (point and rivers) account for a small proportion of up to 160 tonnes per year.

The concentration of total phosphorus compounds did not change much and in various parts of the Lithuanian Sea area of the Baltic Sea during the study period it ranged from 0.030 to 0.034 mg P / l in summer and from 0.039 to 0.044 mg P / l in winter. The average concentration of phosphate phosphorus in the winter offshore area in recent winter periods was about 0.027 ± mg / l, and the average perennial winter concentration of phosphate phosphorus in the offshore area was about 0.019 ± mg / l. The highest concentrations of mineral phosphorus compounds have been found in the open part of the Baltic Sea almost without exception during the last two decades, both in winter and on average during the season. In contrast to nitrogen, the average concentrations of dissolved mineral phosphorus in winter decreased significantly during the observation period from 1992 (Fig. 1–50). These trends were most pronounced on the southern sandy coast, but were inconspicuous or slightly opposite in the high seas.

Unknown_NotAssessed

Unknown_NotAssessed

The maximum amounts of chlorophyll a in the water surface layers of the Baltic Sea region of Lithuania in the last decades averaged up to 21.8 µg / L in the area of influence of the Curonian Lagoon waters.

Over the last decade, the maximum depth of distribution of the branched whale habitat ranged from 6 to 16 m on the coast, i. in some parts of the coast, water quality varied from poor to moderate or good.

NotReported

51063

Unknown_NotAssessed

2264

Unknown_NotAssessed

Unknown_NotAssessed

Unknown_NotAssessed

Unknown_NotAssessed

75-100%

t

t

Not relevant

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

-9999

250

26

-9999

4,8 arba <1,5-1,9 arba <0,99

not relevant

µg N/l

µg P/l

not relevant

μg/l

insufficient data

insufficient data

Insufficient data.

Insufficient data.

Insufficient data.

Summarizing the change in eutrophication indicators in Lithuania, it is obvious that the state of the environment is not good according to most eutrophication indicators. The multi-annual trends in these indicators are quite contradictory and seem to reflect the climatic fluctuations that characterize the region. It is also important that the amount of total nitrogen and total phosphorus entering the Baltic Sea from the territory of Lithuania makes up only about 4% of the total amount of nutrients. Thus, even the influence of the largest Lithuanian river, the Nemunas, on the eutrophication process is mostly observed only in the coastal zone north of Klaipeda.

The runoff of the Nemunas River makes up over 85% of all nitrogen of river origin entering the Lithuanian Baltic Sea area. According to long-term research data, on average, over 40.0 thousand people enter the Baltic Sea on the Nemunas per year. T total nitrogen. A comparison of the inflow of the Nemunas with the instantaneous amounts of total nitrogen and total phosphorus in the whole water area of the Baltic Sea Region of Lithuania (94.3 thousand T N) shows that the N inflow is significant and makes up about 43% of the total amount. Other sources. A significant part of the total nitrogen input, up to 10%, is accounted for by atmospheric precipitation. Meanwhile, other secondary - point sources, runoff of small rivers amount to up to 3 thousand. Tons. The total annual load is just over 50 thousand tons of nitrogen per year.

The results of the monitoring of the last decade show that the average concentrations of total nitrogen in the part of the Baltic Sea belonging to Lithuania in winter are decreasing, although the trends of mineral nitrogen concentrations are not clear. The average concentrations of mineral nitrogen were determined in the zone of the northern stony coast and in the zone of influence of the Curonian Lagoon (average during the period from 1992 to 0.280 mg / l). The northern rocky coastal zone is characterized by higher concentrations of mineral nitrogen than the southern sandy coast. On the other hand, changes in mineral nitrogen concentrations and peak values in winter on the northern rocky coast since 2000. increased.

The runoff of the Nemunas River makes up over 90% of the total phosphorus of river origin entering the Lithuanian Baltic Sea area. According to the data of multi-year surveys, on average, about 2.0 thousand. T of total phosphorus. A comparison of the inflow of the Nemunas with the instantaneous amounts of total total phosphorus in the entire water area of the Baltic Sea Region of Lithuania (8.5 thousand T P) shows that the P inflow accounts for only one fifth (about 21%) of the total amount. Other sources of total phosphorus (point and rivers) account for a small proportion of up to 160 tonnes per year.

The concentration of total phosphorus compounds did not change much and in various parts of the Lithuanian Sea area of the Baltic Sea during the study period it ranged from 0.030 to 0.034 mg P / l in summer and from 0.039 to 0.044 mg P / l in winter. The average concentration of phosphate phosphorus in the winter offshore area in recent winter periods was about 0.027 ± mg / l, and the average perennial winter concentration of phosphate phosphorus in the offshore area was about 0.019 ± mg / l. The highest concentrations of mineral phosphorus compounds have been found in the open part of the Baltic Sea almost without exception during the last two decades, both in winter and on average during the season. In contrast to nitrogen, the average concentrations of dissolved mineral phosphorus in winter decreased significantly during the observation period from 1992 (Fig. 1–50). These trends were most pronounced on the southern sandy coast, but were inconspicuous or slightly opposite in the high seas.

Unknown_NotAssessed

Unknown_NotAssessed

In recent years, water transparency in the Baltic Sea region of Lithuania has significantly increased.

Over the last decade, the maximum depth of distribution of the branched whale habitat ranged from 6 to 16 m on the coast, i. in some parts of the coast, water quality varied from poor to moderate or good.

NotReported

51063

Unknown_NotAssessed

2264

Unknown_NotAssessed

Unknown_NotAssessed

Unknown_NotAssessed

Unknown_NotAssessed

75-100%

t

t

Not relevant

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

-9999

250

26

-9999

4,8 arba <1,5-1,9 arba <0,99

not relevant

µg N/l

µg P/l

not relevant

μg/l

insufficient data

insufficient data

Insufficient data.

Insufficient data.

Insufficient data.

Summarizing the change in eutrophication indicators in the Lithuanian territorial sea and exclusive economic zone, it can be stated that the state of the environment is not good according to most eutrophication indicators. The multi-annual trends in these indicators are quite contradictory and seem to reflect the climatic fluctuations that characterize the region. It is also important that the amount of total nitrogen and total phosphorus entering the Baltic Sea from the territory of Lithuania makes up only about 4% of the total amount of nutrients. Thus, even the influence of the largest Lithuanian river, the Nemunas, on the eutrophication process is mostly observed only in the coastal zone north of Klaipeda.

Unknown_NotAssessed

The results of the monitoring of the last decade show that the average concentrations of total nitrogen in the part of the Baltic Sea belonging to Lithuania in winter are decreasing, although the trends of mineral nitrogen concentrations are not clear. The average mineral nitrogen concentration (sum of NO3 + NO2 and NH4 concentrations of all oxidized and reduced inorganic nitrogen compounds) in winter in the open sea and in the territorial sea outside the WFD typological areas was 0.100 and 0.159 mg / l, respectively.

Unknown_NotAssessed

The concentration of total phosphorus compounds did not change much and in various parts of the Lithuanian Sea area of the Baltic Sea during the study period it ranged from 0.030 to 0.034 mg P / l in summer and from 0.039 to 0.044 mg P / l in winter. The average concentration of phosphate phosphorus in the winter offshore area in recent winter periods was about 0.027 ± mg / l, and the average perennial winter concentration of phosphate phosphorus in the offshore area was about 0.019 ± mg / l. The highest concentrations of mineral phosphorus compounds have been found in the open part of the Baltic Sea almost without exception during the last two decades, both in winter and on average during the season. In contrast to nitrogen, the average concentrations of dissolved mineral phosphorus in winter decreased significantly during the observation period from 1992 (Fig. 1–50). These trends were most pronounced on the southern sandy coast, but were inconspicuous or slightly opposite in the high seas.

Unknown_NotAssessed

Unknown_NotAssessed

In recent years, water transparency in the Baltic Sea region of Lithuania has significantly increased.

Unknown_NotAssessed

NotReported

Unknown_NotAssessed

Unknown_NotAssessed

Unknown_NotAssessed

Unknown_NotAssessed

Unknown_NotAssessed

Unknown_NotAssessed

Unknown_NotAssessed

Unknown_NotAssessed

Unknown_NotAssessed

Unknown_NotAssessed

Not relevant

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater

The main agricultural activities are urban wastewater