Paleolimnology Record of Human Impact on a Lake Ecosystem: The Case of Shallow Lakes in Central Java

International Conference on Life Sciences and Technology

Retnaningsih Soeprobowati, Tri^1^2 ; Jumari^1 ; Hariyati, Riche^1 ; Gell, Peter^2^3

Dept. Biology, Diponegoro University, Semarang, Indonesia^1

School of Postgraduate Studies, Diponegoro University, Semarang, Indonesia^2

School of Health and Life Sciences, Federation University, Australia^3

关键词: Agricultural irrigation;    diatoms;    Environmental change;    Management plans;    Rawapening;    Urban development;    Warna;    Water hyacinth growth;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/276/1/012015/pdf
DOI  :  10.1088/1755-1315/276/1/012015

来源: IOP

【 摘 要 】

Paleolimnology approaches were used to assess human impacts on Rawapening and Warna Lakes, small lakes in Central Java, which provide an essential function for agricultural irrigation. Paleolimnology is the study of the stratigraphy of lakes where fossils are well preserved in the sediment thereby providing information about the past condition of the catchment area. However, paleolimnological studies in Indonesia have been rare. The organisms that are well preserved in the sediment are diatoms, due to their siliceous cell wall. Human's activities were recorded in the 63 cm sediment core from Rawapening and 24 cm sediment core from Warna Lakes over the past 41 and 124 years, respectively. Human impacts on the lake ecosystems and their catchment area are highly variable in time and space. Since 1967 Rawapening Lake has been in a meso-eutrophic condition, related to releases from the nearby agricultural program. Since the 1990s Rawapening Lake experienced hypereutrophic conditions with pH > 9 that induced uncontrolled water hyacinth growth, which in turn, reduced lake function. The record showed Warna Lake to have been subject to eutrophication since 1980 likely owing to the acceleration of activities such as potato farming and deforestation for urban development in the lake's catchment in recent decades. The trend of these past environmental changes could be used to predict the future condition; therefore, the appropriate management plans can be developed to guide interventions needed to ensure the future sustainable use of the lake.