KONSERVASI DANAU RANU PANE DAN RANU REGULO DI TAMAN NASIONAL BROMO TENGGER SEMERU

Abstract

The lakes in Bromo Tengger Semeru National Park (BTSNP) have a caldera or giant crater, however, the intensification of land use surounding as a residential area, agricultural land and natural tourism gived the impacts to lakes. The study was carried out at lakes of Ranu Pane and Ranu Regulo, in Bromo Tengger Semeru National Park (TNBTS), East Java Province. The study purposed to know ecosystem changing of lakes and recomendation of conservation strategies. The research method was carried out by analyzing water qualities (physic, chemitry and microbiology) of Ranu Pane and ranu Regulo lakes. The results of this study found that Ranu Pane lake ecosystem was invaded by a threshold (Salvinia molesta Mitchell) of about 80%, causing an increase in BOD and COD content, followed by a decrease in DO and pH. Lake of Ranu Regulo has a higher fertility value (N/P = 16.24) than Ranu Pane. Therefore, the management need to mitigate to reduce the risk of pollution through public awareness and tourists. Kata kunci: Konservasi, ekosistem, danau, pencemaran, kualitas air ABSTRAK Danau di Taman Nasional Bromo Tengger Semeru (TNBTS) adalah kaldera atau kawah raksasa, tetapi intensifikasi pemanfaatan lahan di sekitar danau berupa pemukiman, lahan pertanian dan pariwisata alam berdampak terhadap danau. Penelitian dilakukan di Danau Ranu Pane dan Ranu Regulo, kawasan TNBTS, Provinsi Jawa Timur, dengan tujuan untuk mengetahui perubahan ekosistem danau dan rekomendasi strategi konservasi. Metode penelitian dilakukan dengan menganalisis kualitas air (fisik, kimia dan mikrobiologi) dari Danau Ranu Pane dan Ranu Regulo. Hasil penelitian menemukan bahwa ekosistem Danau Ranu Pane telah tertutupi oleh tumbuhan air jenis ki ambang (Salvinia molesta Mitchell) sekitar 80% yang menyebabkan peningkatan kandungan Biology Oxygen Demand (BOD) dan Chemical Oxygen Demand (COD), diikuti penurunan Dissolved Oxygen (DO) dan pH. Danau Ranu Regulo memiliki nilai kesuburan yang lebih tinggi (N/P=16,24) dibandingkan Ranu Pane. Hasil penelitian ini merekomendasikan agar pihak pengelola kawasan melakukan mitigasi untuk mengurangi risiko pencemaran melalui penyadaran masyarakat dan wisatawan.