Trends of phosphorus, nitrogen and chlorophyll a concentrations in Finnish rivers and lakes in 1975-2000

被引：117

作者：

Räike, A ^{[1
]}

Pietiläinen, OP ^{[1
]}

Rekolainen, S ^{[1
]}

Kauppila, P ^{[1
]}

Pitkänen, H ^{[1
]}

Niemi, J ^{[1
]}

Raateland, A ^{[1
]}

Vuorenmaa, J ^{[1
]}

机构：

[1] Finnish Environm Inst, FIN-00251 Helsinki, Finland

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2003年 / 310卷 / 1-3期

关键词：

nitrogen; phosphorus; nutrients; chlorophyll a; eutrophication; river; lake; trend;

D O I：

10.1016/S0048-9697(02)00622-8

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

During recent decades the amounts of nutrients discharged to Finnish surface waters have markedly decreased. This has been achieved by considerable investments in water protection, which were made mainly to improve municipal and industrial wastewater purification. We investigated whether these water protection measures have decreased phosphorus and nitrogen concentrations in Finnish rivers and lakes. In addition, possible trends in chlorophyll a concentrations in lakes were studied. The data consisted of a total of over 68 000 monitoring results of 22 rivers and 173 lakes (or sub-basins of lakes) with different types of catchment areas. The study period covered the years 1975-2000 and the non-parametric Kendall Tau b and Seasonal Kendall tests were applied for detecting trends. Decreasing nutrient concentration trends were typical in many lakes and rivers earlier polluted by municipal and industrial wastewaters. Increasing nutrient concentration trends were common in smaller rivers and lakes receiving diffuse loading from, agriculture. The results show that the investments directed towards wastewater purification have effectively improved the quality of Finnish inland waters. However, no clear effects of decreasing non-point loading were found. Thus, more. effective measures should be directed towards decreasing non-point source loading. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：47 / 59

页数：13

共 41 条

[1]

Anneville O, 2000, ARCH HYDROBIOL, V148, P607

[2]

[Anonymous], PUBL WATER RES I

[3] Internal and external loading as regulators of nutrient concentrations in the agriculturally loaded Lake Pyhajarvi (southwest Finland) [J].