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"Teknologi panel surya terapung yang diterapkan di Danau Mahoni Universitas Indonesia merupakan panel surya bifacial. Namun penutupan badan air oleh solar panel terapung dapat menyebabkan perubahan kualitas air secara temporal. Sejauh ini, belum terdapat penelitian lebih lanjut mengenai pengaruh solar panel terapung di perairan Indonesia. Maka dari itu, penelitian ini bertujuan untuk mencari pengaruh penutupan permukaan danau terutama pada produktivitas primer, COD, dan BOD serta hubungan produktivitas primer dengan BOD dan COD. Pengambilan sampel air dilakukan pada permukaan air, sedangkan perhitungan produktivitas primer menggunakan metode botol terang-gelap dan dilakukan inkubasi selama 3 jam. Secara temporal, nilai BOD, COD, dan produktivitas primer di bawah solar panel terapung, yang selanjutnya akan disebut titik 1, memiliki nilai kosentrasi yang lebih rendah dibandingkan dengan yang berada di lokasi yang terbuka, yang selanjutnya akan disebut titik 2. Rata-rata kosentrasi BOD di titik 1 yaitu 4.25 mg/l dan titik 2 yaitu 1.56 mg/l. Adapun rata-rata kosentrasi COD di titik 1 adalah 31.875 mg/l dan titik 2 adalah 33.125 mg/l. Sementara itu, rata-rata produktivitas primer titik 1 yaitu 36.46 mg C/m3/jam dan titik 2 yaitu 114.58 mg C/m3/jam. Hasil analisis uji independen t menunjukkan adanya penurunan yang signifikan pada nilai BOD dan produktivitas primer di area yang tertutup solar panel. Sedangkan, nilai COD tidak memiliki perbedaan yang signifikan antara kedua titik. Adapun hasil uji korealasi Pearson’s menunjukkan bahwa produktivitas primer tidak memiliki hubungan yang signifikan terhadap parameter BOD dan COD. Maka dari itu penutupan area badan air dengan solar panel terapung menurunkan kualitas air Danau Mahoni terutama pada parameter BOD, COD, dan produktivitas primer.

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The technology of floating photovoltaic applied at Lake of Mahoni, University of Indonesia were bifacial photovoltaic. However, its body of water which was covered by the floating photovoltaic could cause temporal changes in water quality. To date, there had been no further research on the effects of floating photovoltaic in the waters of Indonesia. Therefore, this research aimed to explore the effects of the covered lake surface especially on primary productivity, COD and BOD, also examined how primary productivity was related to BOD and COD. Water sampling was carried out on the surface of the water, meanwhile the primary productivity was calculated utilizing the method of light-dark bottle and incubated for 3 hours. Temporarily, the values of BOD, COD, and primary productivity under the floating photovoltaic, hereinafter referred to as station 1, had lower concentration values compared to those in open areas, hereinafter referred to as station 2. The average BOD concentration at station 1 was 4.25 mg/l and at station 2 was 1.56 mg/l. As for the average COD concentration at station 1 was 31.875 mg/l and at station 2 was 33.125 mg/l. Meanwhile, the average primary productivity at station 1 was 36.46 mg C/m3/hour and at station 2 was 114.58 mg C/m3/hour. The results of independent t test showed a significant decrease in the values of BOD and primary productivity in areas covered by floating photovoltaic. Meanwhile, the values of COD did not show a significant difference between the two stations. As for the results of the Pearson's correlation test suggest that primary productivity did not have a significant relationship with the parameters of BOD and COD. Therefore, covered body of water by floating photovoltaic reduced the water quality at Lake of Mahoni, especially in the parameters of BOD, COD, and primary productivity."

"Telah dilakukan penelitian mengenai tingkat serapan karbon dan kandungan klorofil serta analisis sampah, sedimen, dan volume di lima situ Kampus UI Depok. Penelitian bertujuan untuk menganalisis tingkat serapan karbon dan kandungan klorofil, serta materi organik dalam sampah, sedimen dan volume di lima situ Kampus UI Depok. Penelitian dilakukan di lima situ Kampus UI Depok, yaitu Situ Agathis, Situ Mahoni, Situ Puspa, Situ Ulin, dan Situ Salam. Pengambilan sampel dilakukan pada bulan Maret--April 2014. Pengukuran produktivitas primer perairan menggunakan metode botol gelap-terang. Botol gelap dan botol terang diletakkan pada kedalaman 0 cm, 10 cm, 30 cm, 50 cm, 70 cm, dan 80 cm. Pengambilan sampel fitoplankton dilakukan menggunakan plankton net. Pengukuran kandungan klorofil-a dan klorofil-b menggunakan spektrofotometer dengan panjang gelombang 750, 664, 647 dan 630 nm. Perangkap sampah organik berupa kain nylon dengan ukuran pori 1 mm2 diletakkan pada inlet dan outlet secara bersamaan di lima situ Kampus UI Depok. Pengambilan sampel sedimen dilakukan menggunakan Peterson Grab. Sampel sedimen dianalisis kadar karbon organik dengan metode Walkley-Black. Metode 3D Analyst ArcView 10.1 digunakan untuk menghitung volume situ. Tingkat serapan karbon di lima situ Kampus UI Depok memiliki potensi menyerap karbon rata-rata sebesar 48,61 mgC/m3/jam. Kandungan klorofil-a dan klorofil-b di lima situ Kampus UI Depok rata-rata sebesar 2,59 mg/l dan 0,35 mg/l. Hasil identifikasi sampel fitoplankton diperoleh empat kelas, yaitu Chlorophyceae, Cyanophyceae, Euglenophyceae, dan Bacillariophyceae. Kepadatan tertinggi dan nilai dominansi tertinggi pada sampel fitoplankton di lima situ Kampus UI Depok terdapat pada kelas Chlorophyceae. Terjadi penumpukan sampah organik sebesar 0,55 gr/m3/jam. Tipe sedimen pasir mendominasi di perairan lima situ Kampus UI Depok. Kandungn karbon pada sampel sedimen kerikil sebesar 19,75--26,58 ppm, pasir sebesar 28,47--38,55 ppm, dan lumpur sebesar 36,79--42,05 ppm. Perairan lima situ di Kampus UI Depok memiliki potensi dalam menampung volume air sebesar 654.830 m3.

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Research has conducted about the level of carbon uptake and chlorophyll content as well as the analysis of trash, sediment, and volume in five lakes at Campus UI Depok. The study aimed to analyze the level of carbon uptake and chlorophyll content, and organic matter in the litter, sediment and volume in five lakes at Campus UI Depok. The study was conducted in five lakes at Campus UI Depok, namely Agathis, Mahoni, Puspa, Ulin, and Salam. Sampling was conducted in March-April 2014. Measurements of primary productivity in the water using light-dark bottle method. Dark bottle and light bottle placed at a depth of 0 cm, 10 cm, 30 cm, 50 cm, 70 cm, and 80 cm.

Sampling of phytoplankton was conducted using a plankton net. Measurement of chlorophyll-a and chlorophyll-b using a spectrophotometer with a wavelength of 750, 664, 647 and 630 nm. Pitfalls of organic waste in the form of nylon fabric with a pore size of 1 mm2 placed at the inlet and outlet simultaneously in five lakes at Campus UI Depok.

Sampling of sediment was conducted using a Peterson Grab. Sediment samples were analyzed with the organic carbon content of the Walkley-Black method. 3D Analyst ArcView 10.1 method used to calculate the volume of the lakes. The rate of carbon uptake in five UI Depok it has the potential to absorb carbon by an average of 48.61 mgC/m3/hour. The content of chlorophyll-a and chlorophyll-b in five lakes at Campus UI Depok was average of 2.59 mg/l and 0.35 mg/l.

The results of the identification of phytoplankton samples obtained four classes, namely Chlorophyceae, Cyanophyceae, Euglenophyceae, and Bacillariophyceae. The highest density and highest dominance values in samples of phytoplankton in five lakes at Campus UI Depok contained in the class Chlorophyceae. Build up of organic waste by 0.55 gr/m3/hour. Sand sediment types dominate in five lakes at Campus UI Depok. Carbon content in sediment samples gravel at 19.75 to 26.58 ppm, the sand at 28.47 to 38.55 ppm, and the mud of 36.79 to 42.05 ppm. The five lakes at Campus UI Depok has the potential to accommodate the volume of waters at 654.830 m3."

"Instalasi solar panel terapung memberikan dampak berupa terhalangnya cahaya matahari, yang merupakan sumber energi fitoplankton untuk melakukan fotosintesis, masuk ke badan air. Perubahan dalam aktivitas fitoplankton akan memengaruhi produktivitas primer serta konsentrasi sejumlah nutrien yang terlibat. Penelitian ini bertujuan untuk menganalisis pengaruh penutupan permukaan badan air berupa solar panel terapung terhadap perubahan produktivitas primer dan konsentrasi nutrien yaitu nitrat, amonia, dan fosfat perairan, serta hubungan antara produktivitas primer dan konsentrasi tiap nutrien. Penelitian dilakukan dengan objek studi Danau Mahoni UI dengan jumlah pengambilan sampel sebanyak 8 kali dalam kurun waktu delapan minggu. Analisis data dilakukan dengan menggunakan uji parametrik independent t test dan uji korelasi Pearson's. Penutupan permukaan danau oleh solar panel terapung memberi pengaruh yang signifikan secara statistic terhadap penurunan produktivitas primer danau dengan rata-rata penurunan produktivitas primer danau -79,79%, dan pengaruh yang tidak signifikan secara statistik terhadap peningkatan konsentrasi nutrien dengan rata-rata peningkatan konsentrasi nitrat 3,45%, amonia 18,96%, dan fosfat 4,87%. Korelasi produktivitas primer dengan konsentrasi nitrat dan amonia danau lebih kuat pada keadaan tanpa penutupan permukaan danau, sementara korelasi produktivitas primer dengan konsentrasi fosfat danau lebih kuat pada keadaan dengan penutupan permukaan danau.

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Floating solar panel installation has an impact of blocking the sunlight, which serves as the source of energy for phytoplankton photosynthesis, to reach the water bodies. Changes in phytoplankton activities will affect water primary productivity and the concentration of involved nutrients. This study aims to analyze the effect of covering water bodies by floating solar panel on water primary productivity and nutrients (nitrate, ammonia, phosphate) concentration changes, and the relationship between water primary productivity and each nutrient concentration. The study is carried out with Lake Mahoni UI as the study object, with 8 times sampling in the span of eight weeks. Data analysis uses independent t test and Pearson's correlation. The covering of lake by floating solar panel has statistically significant effect on the decrease of lake primary productivity with average decrease of -79,79%, and statistically insignificant effect on the increase of lake nutrient concentration with average increase of 3,45% on nitrate concentration, 18,96% on ammonia concentration, and 4,87% on phosphate concentration. The correlation between lake primary productivity and nitrate and ammonia concentration is stronger without the covering of water bodies, while the correlation between lake primary productivity and phosphate concentration is stronger with the covering of water bodies."

"Penutupan permukaan air menghalangi cahaya matahari yang masuk ke badan air sehingga mengganggu proses fotosintesis fitoplankton. Konsentrasi klorofil-a berpengaruh terhadap perubahan aktivitas fitoplankton yang akan mempengaruhi produktivitas primer. Tujuan dari penelitian untuk menganalisis pengaruh kedalaman terhadap produktivitas primer fitoplankton dan klorofil-a serta korelasi antar keduanya pada kondisi dengan dan tanpa adanya penutupan permukaan air. Penelitian dilakukan di Solar Panel Terapung (SPT) Danau Mahoni UI. Sampel diambil pada kedalaman 30 cm dan 60 cm pada kondisi tertutup dan kondisi terbuka. Analisis data dilakukan dengan menggunakan regresi, uji parametrik independent t test, uji korelasi Pearson dan Spearman Rho. Berdasarkan nilai rata-rata, menunjukan bahwa kedalaman air memberikan pengaruh terhadap kedua parameter. Namun, berdasarkan uji independent t test didapatkan nilai sig. (2-tailed) >0,05 bahwa tidak terdapat perbedaan nilai produktivitas primer dan konsentrasi klorofil-a yang berarti antara kedalaman 30 cm dengan kedalaman 60 cm. Hubungan produktivitas dengan klorofil-a pada kondisi tertutup menghasilkan koefisien determinasi (R2 ) sebesar 0,8, sementara kondisi terbuka menghasilkan R 2 sebesar 0,088. Hasil analisis menunjukan bahwa korelasi produktivitas primer dengan klorofil-a lebih kuat pada kondisi tertutup. Keberadaan penutupan permukaan badan air berupa solar panel terapung memberikan pengaruh yang siginifikan terhadap penurunan nilai produktivitas primer dan klorofil-a.

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The closure of the water surface blocks the sunlight that enters the water body so that it interferes with the photosynthetic process of phytoplankton. The concentration of chlorophyll-a affects changes in phytoplankton activity which will affect primary productivity.The purpose of the study was to analyze the effect of depth on the primary productivity of phytoplankton and chlorophyll-a and the correlation between them in conditions with and without water surface cover. The research was conducted on the floating solar panel of Lake Mahoni UI. Samples were taken at a depth of 30 cm and 60 cm in closed and open conditions. Data analysis was performed using regression, parametric independent t test, Pearson and Spearman Rho correlation test. Based on the average value, it shows that the water depth has an effect on both parameters. However, based on the independent t test, the sig. value was obtained. (2-tailed) > 0.05 that there is no significant difference in the value of primary productivity and chlorophyll-a concentration between a depth of 30 cm and a depth of 60 cm. The relationship between productivity and chlorophyll-a in the closed condition resulted in a coefficient of determination (R2) of 0.8, while the open condition resulted in an R2 of 0.088. The results of the analysis showed that the correlation of primary productivity with chlorophyll-a was stronger in closed conditions. The existence of surface cover of water bodies in the form of floating solar panels has a significant effect on the decrease in the value of primary productivity and chlorophyll-a."