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Abstrak :
[Penelitian mengenai potensi makroalga alami Sargassum polycystum dan makroalga budidaya Eucheuma cottonii dalam menyerap dan menyimpan karbon serta nutrien di Pulau Panjang, Teluk Banten telah dilakukan pada bulan Oktober hingga November 2014. Penelitian bertujuan untuk mengetahui laju penyerapan karbon, kandungan nutrien dan produktivitas primer dari makroalga S. polycystum dan E. cottonii. Lokasi penelitian terletak di bagian hamparan gosong karang dan berlumpur dengan kedalaman 0,5-5 m. Pengamatan pertumbuhan dan laju penyerapan karbon menggunakan metode penandaan thallus pada 30 sampel makroalga setiap hari selama 7 hari. Sampel makroalga selanjutnya dianalisis kandungan nutriennya. Hasil penelitian didapatkan estimasi laju penyerapan karbon S. polycystum dan E. cottonii adalah 0,0081 gC/hari dan 0,0083 gC/hari. Kandungan karbon, nitrogen dan fosfat di S. polycystum adalah sebanyak 6,84%, 1,72% dan 0,009% sedangkan kandungan karbon, nitrogen dan fosfat di E. cottonii adalah 5,99%, 0,67% dan 0,006%. Berdasarkan analisis statistik dengan uji t, terdapat perbedaan yang signifikan pada laju pertumbuhan, kandungan nitrogen dan fosfat S. polycystum dengan E. cottonii. Sedangkan untuk kandungan karbon tidak terdapat perbedaan yang signifikan antara S. polycystum dengan E. cottonii. Selanjutnya, uji korelasi didapatkan bahwa adanya korelasi antara laju pertumbuhan S. polycystum dan E. cottonii dengan kandungan nitrogen masingmasing sedangkan antara laju pertumbuhan dengan kandungan karbon dan fosfat tidak terdapat korelasi. Produktivitas primer diukur dengan metode botol terang dan botol gelap yang dimodifikasi. Pengukuran produktivitas primer dilakukan pada kedalaman 0,5 m untuk S. polycystum dan 0,1 m untuk E. cottonii. Kandungan oksigen terlarut diukur dengan DO meter. Hasil penelitian didapatkan rata-rata produktivitas primer S. polycystum sebesar 10,259 ± 3,385 mgC/g/hari dan E. cottonii sebesar 7,757 ± 4,398 mgC/g/hari.;The research about the potency of wild macroalgae Sargassum polycystum and cultivation macroalgae Eucheuma cottonii to absorb and store carbon also nutrient in Panjang Island, Banten Bay was held on October until November 2014. The research was aimed to estimate carbon sequestration, nutrient content and primary productivity from macroalgae S. polycystum and E. cottonii. Location of the research in the stretch of reef and muddy with a depth of 0,5-5 m. The observation of growth rate and carbon sequestration used thallus marking method in 30 macroalgae shoots everyday for 7 days. Macroalgae was analyzed its nutrient content. The results showed that estimation carbon sequestration by S. polycystum and E. cottonii were 0,0081 gC/day and 0,0083 gC/day. The content of carbon, nitrogent and phosphor for Macroalgae S. polycystum were 6,84%, 1,72% and 0,009% respectively while the content of carbon, nitrogent and phosphor for Macroalgae E. cottonii were 5,99%, 0,67% and 0,006% respectively. Based on statistical analysis by t test, there was found significant difference on the growth rate, nitrogent and phosphor content of S. polycystum with E. cottonii. While for the carbon content, there was no significant difference between S. polycystum with E. cottonii. Furthermore, correlation test showed that there was a correlation between the growth rate of S. polycystum and E. cottonii with nitrogent content respectively while between the growth rate with carbon and phosphor content, there was no correlation. Primary productivity were measured by the light and dark bottle method with modification. Measurement of primary productivity was held at a depth of 0,5 m from the surface for S. polycystum and 0,1 m from the surface for E. cottonii. Dissolved oxygen was measured by DO meter. The result showed that mean of primary productivity for S. polycystum was 10,259 ± 3,385 mgC/g/day and E. cottonii was 7,757 ± 4,398 mgC/g/day;The research about the potency of wild macroalgae Sargassum polycystum and cultivation macroalgae Eucheuma cottonii to absorb and store carbon also nutrient in Panjang Island, Banten Bay was held on October until November 2014. The research was aimed to estimate carbon sequestration, nutrient content and primary productivity from macroalgae S. polycystum and E. cottonii. Location of the research in the stretch of reef and muddy with a depth of 0,5-5 m. The observation of growth rate and carbon sequestration used thallus marking method in 30 macroalgae shoots everyday for 7 days. Macroalgae was analyzed its nutrient content. The results showed that estimation carbon sequestration by S. polycystum and E. cottonii were 0,0081 gC/day and 0,0083 gC/day. The content of carbon, nitrogent and phosphor for Macroalgae S. polycystum were 6,84%, 1,72% and 0,009% respectively while the content of carbon, nitrogent and phosphor for Macroalgae E. cottonii were 5,99%, 0,67% and 0,006% respectively. Based on statistical analysis by t test, there was found significant difference on the growth rate, nitrogent and phosphor content of S. polycystum with E. cottonii. While for the carbon content, there was no significant difference between S. polycystum with E. cottonii. Furthermore, correlation test showed that there was a correlation between the growth rate of S. polycystum and E. cottonii with nitrogent content respectively while between the growth rate with carbon and phosphor content, there was no correlation. Primary productivity were measured by the light and dark bottle method with modification. Measurement of primary productivity was held at a depth of 0,5 m from the surface for S. polycystum and 0,1 m from the surface for E. cottonii. Dissolved oxygen was measured by DO meter. The result showed that mean of primary productivity for S. polycystum was 10,259 ± 3,385 mgC/g/day and E. cottonii was 7,757 ± 4,398 mgC/g/day;The research about the potency of wild macroalgae Sargassum polycystum and cultivation macroalgae Eucheuma cottonii to absorb and store carbon also nutrient in Panjang Island, Banten Bay was held on October until November 2014. The research was aimed to estimate carbon sequestration, nutrient content and primary productivity from macroalgae S. polycystum and E. cottonii. Location of the research in the stretch of reef and muddy with a depth of 0,5-5 m. The observation of growth rate and carbon sequestration used thallus marking method in 30 macroalgae shoots everyday for 7 days. Macroalgae was analyzed its nutrient content. The results showed that estimation carbon sequestration by S. polycystum and E. cottonii were 0,0081 gC/day and 0,0083 gC/day. The content of carbon, nitrogent and phosphor for Macroalgae S. polycystum were 6,84%, 1,72% and 0,009% respectively while the content of carbon, nitrogent and phosphor for Macroalgae E. cottonii were 5,99%, 0,67% and 0,006% respectively. Based on statistical analysis by t test, there was found significant difference on the growth rate, nitrogent and phosphor content of S. polycystum with E. cottonii. While for the carbon content, there was no significant difference between S. polycystum with E. cottonii. Furthermore, correlation test showed that there was a correlation between the growth rate of S. polycystum and E. cottonii with nitrogent content respectively while between the growth rate with carbon and phosphor content, there was no correlation. Primary productivity were measured by the light and dark bottle method with modification. Measurement of primary productivity was held at a depth of 0,5 m from the surface for S. polycystum and 0,1 m from the surface for E. cottonii. Dissolved oxygen was measured by DO meter. The result showed that mean of primary productivity for S. polycystum was 10,259 ± 3,385 mgC/g/day and E. cottonii was 7,757 ± 4,398 mgC/g/day;The research about the potency of wild macroalgae Sargassum polycystum and cultivation macroalgae Eucheuma cottonii to absorb and store carbon also nutrient in Panjang Island, Banten Bay was held on October until November 2014. The research was aimed to estimate carbon sequestration, nutrient content and primary productivity from macroalgae S. polycystum and E. cottonii. Location of the research in the stretch of reef and muddy with a depth of 0,5-5 m. The observation of growth rate and carbon sequestration used thallus marking method in 30 macroalgae shoots everyday for 7 days. Macroalgae was analyzed its nutrient content. The results showed that estimation carbon sequestration by S. polycystum and E. cottonii were 0,0081 gC/day and 0,0083 gC/day. The content of carbon, nitrogent and phosphor for Macroalgae S. polycystum were 6,84%, 1,72% and 0,009% respectively while the content of carbon, nitrogent and phosphor for Macroalgae E. cottonii were 5,99%, 0,67% and 0,006% respectively. Based on statistical analysis by t test, there was found significant difference on the growth rate, nitrogent and phosphor content of S. polycystum with E. cottonii. While for the carbon content, there was no significant difference between S. polycystum with E. cottonii. Furthermore, correlation test showed that there was a correlation between the growth rate of S. polycystum and E. cottonii with nitrogent content respectively while between the growth rate with carbon and phosphor content, there was no correlation. Primary productivity were measured by the light and dark bottle method with modification. Measurement of primary productivity was held at a depth of 0,5 m from the surface for S. polycystum and 0,1 m from the surface for E. cottonii. Dissolved oxygen was measured by DO meter. The result showed that mean of primary productivity for S. polycystum was 10,259 ± 3,385 mgC/g/day and E. cottonii was 7,757 ± 4,398 mgC/g/day;The research about the potency of wild macroalgae Sargassum polycystum and cultivation macroalgae Eucheuma cottonii to absorb and store carbon also nutrient in Panjang Island, Banten Bay was held on October until November 2014. The research was aimed to estimate carbon sequestration, nutrient content and primary productivity from macroalgae S. polycystum and E. cottonii. Location of the research in the stretch of reef and muddy with a depth of 0,5-5 m. The observation of growth rate and carbon sequestration used thallus marking method in 30 macroalgae shoots everyday for 7 days. Macroalgae was analyzed its nutrient content. The results showed that estimation carbon sequestration by S. polycystum and E. cottonii were 0,0081 gC/day and 0,0083 gC/day. The content of carbon, nitrogent and phosphor for Macroalgae S. polycystum were 6,84%, 1,72% and 0,009% respectively while the content of carbon, nitrogent and phosphor for Macroalgae E. cottonii were 5,99%, 0,67% and 0,006% respectively. Based on statistical analysis by t test, there was found significant difference on the growth rate, nitrogent and phosphor content of S. polycystum with E. cottonii. While for the carbon content, there was no significant difference between S. polycystum with E. cottonii. Furthermore, correlation test showed that there was a correlation between the growth rate of S. polycystum and E. cottonii with nitrogent content respectively while between the growth rate with carbon and phosphor content, there was no correlation. Primary productivity were measured by the light and dark bottle method with modification. Measurement of primary productivity was held at a depth of 0,5 m from the surface for S. polycystum and 0,1 m from the surface for E. cottonii. Dissolved oxygen was measured by DO meter. The result showed that mean of primary productivity for S. polycystum was 10,259 ± 3,385 mgC/g/day and E. cottonii was 7,757 ± 4,398 mgC/g/day, The research about the potency of wild macroalgae Sargassum polycystum and cultivation macroalgae Eucheuma cottonii to absorb and store carbon also nutrient in Panjang Island, Banten Bay was held on October until November 2014. The research was aimed to estimate carbon sequestration, nutrient content and primary productivity from macroalgae S. polycystum and E. cottonii. Location of the research in the stretch of reef and muddy with a depth of 0,5-5 m. The observation of growth rate and carbon sequestration used thallus marking method in 30 macroalgae shoots everyday for 7 days. Macroalgae was analyzed its nutrient content. The results showed that estimation carbon sequestration by S. polycystum and E. cottonii were 0,0081 gC/day and 0,0083 gC/day. The content of carbon, nitrogent and phosphor for Macroalgae S. polycystum were 6,84%, 1,72% and 0,009% respectively while the content of carbon, nitrogent and phosphor for Macroalgae E. cottonii were 5,99%, 0,67% and 0,006% respectively. Based on statistical analysis by t test, there was found significant difference on the growth rate, nitrogent and phosphor content of S. polycystum with E. cottonii. While for the carbon content, there was no significant difference between S. polycystum with E. cottonii. Furthermore, correlation test showed that there was a correlation between the growth rate of S. polycystum and E. cottonii with nitrogent content respectively while between the growth rate with carbon and phosphor content, there was no correlation. Primary productivity were measured by the light and dark bottle method with modification. Measurement of primary productivity was held at a depth of 0,5 m from the surface for S. polycystum and 0,1 m from the surface for E. cottonii. Dissolved oxygen was measured by DO meter. The result showed that mean of primary productivity for S. polycystum was 10,259 ± 3,385 mgC/g/day and E. cottonii was 7,757 ± 4,398 mgC/g/day]

Abstrak :
Pertumbuhan penduduk di Kota Depok pada 20 tahun terakhir tercatat mencapai 2 kali lipatnya dari tahun 2020 sehingga menyebabkan adanya perubahan lahan dari tutupan vegetasi menjadi non vegetasi sebagai ruang terbuka hijau publik. Penelitian ini bertujuan untuk menelaah struktur komposisi vegetasi dan keanekaragaman burung di Hutan Kota UI berdasarkan NDVI, menganalisis pengaruh kerapatan vegetasi pada suhu permukaan (LST) dan kelembaban lahan (NDMI), menilai kemampuan Hutan Kota UI dalam menyerap karbon, menganalisis persepsi masyarakat dan membangun konsep sosiobioekologi hutan kota berkelanjutan pada Hutan Kota UI. Metode yang digunakan adalah metode campuran yaitu menggunakan metode kuantitatif dan kualitatif. Hasil penelitian menunjukkan bahwa tidak ada beda keragaman vegetasi pada tiap kelas NDVI dan ada beda nyata keragaman burung pada tiap kelas NDVI. Hutan Kota UI mampu menyerap karbon sebesar 612.259ton/ha (6,17triliun rupiah). Masyarakat merasa senang dengan keberadaan hutan kota sehingga status sosiobioekologi Hutan Kota UI adalah baik. ......Population growth in Depok City in the last 20 years was recorded to have doubled from 2020, causing a change in land from vegetation cover to non-vegetation. This study aims to examine the structure of vegetation composition and bird diversity in the UI City Forest based on NDVI, analyze the effect of vegetation density on surface temperature (LST) and soil moisture (NDMI), assess its ability to absorb carbon, analyze community perceptions and build socio-bioecology concepts of sustainable urban forests in the UI Urban Forest. The method used is a mixed method using quantitative and qualitative. The results showed no difference in the vegetation diversity but a significant difference bird each NDVI class. UI Urban Forest can absorb carbon of 612,258 tons/ha (6.17 trillion rupiahs) also the community perception is happy with the urban forest’s existence so that the socio-bioecological status of the UI City Forest is good.

Abstrak :
Usaha mitigasi perubahan iklim dengan memanfaatkan vegetasi laut sebagaipenyerap blue carbon saat ini sedang digencarkan, salah satu vegetasi tersebut ialahmakroalga. Muara Binuangeun, Banten yang terletak di pesisir pulau Jawa merupakankawasan yang berpotensi sebagai penyerap CO2 dan dihuni oleh beragam jenismakroalga, antara lain Gracilaria verrucosa yang merupakan makroalga denganfrekuensi kehadiran tertinggi dan Halimeda opuntia yang dikenal sebagai makroalgaberkapur dimana kandungan nutriennya pernah diteliti di Muara Binuangeunsebelumnya. Penelitian ini telah dilakukan pada bulan Maret--Mei 2018, dengan tujuanuntuk mengetahui seberapa besar perbedaan potensi penyerapan dan penyimpanankarbon pada makroalga Gracilaria verrucosa dan Halimeda opuntia di MuaraBinuangeun, Banten. Hasil penelitian yang didapatkan yaitu rata-rata potensipenyerapan karbon G. verrucosa dan H. opuntia berturut-turut adalah sebesar 228,73gC/m2/hari dan 1500,57 gC/m2/hari, sedangkan rata-rata potensi penyimpanan karbonG. verrucosa dan H. opuntia berturut-turut adalah sebesar 135,29 gC/m2/hari dan217,01 gC/m2/hari. Kandungan karbon pada G. verrucosa adalah sebesar 4,47 sedangkan H. opuntia sebesar 4,64 . Berdasarkan analisis hasil uji T, potensipenyerapan karbon H. opuntia secara signifikan lebih tinggi dari G. verrucosa danpenyimpanan karbon H. opuntia lebih tinggi dari G. verrucosa namun tidak signifikan.Selain itu, kadar abu pada H. opuntia lebih tinggi daripada G. verrucosa dan kadar airH. opuntia lebih rendah daripada G. verrucosa. Hal tersebut dikarenakan H. opuntialebih banyak menyimpan karbon dalam bentuk zat kapur. Oleh karena itu, usahakonservasi dapat dilakukan pada makroalga yang berpotensi tinggi dalam penyerap danpenyimpan karbon seperti H. opuntia untuk mengurangi emisi karbon dari atmosfer. ...... Efforts to mitigate climate change by utilizing marine vegetation as a blue carbonabsorber are currently being intensified, one of which is macroalgae vegetation. MuaraBinuangeun, Banten, which is located on the coast of Java, is a potential area as a CO2absorber and is inhabited by various types of macroalgae, including Gracilariaverrucosa which is the macroalgae with the highest attendance frequency and Halimedaopuntia, known as calcareous macroalgae, whose nutrient content have been studied inMuara Binuangeun before. This research was conducted in March May 2018, with theaim to know how much the difference of the carbon absorption and storage potentialbetween Gracilaria verrucosa and Halimeda opuntia in Muara Binuangeun, Banten.The result showed that the average carbon absorption potential of G. verrucosa and H.opuntia was 228.73 gC m2 day and 1500.57 gC m2 day, respectively, while the averagecarbon storage potential of G. verrucosa and H. opuntia were respectively 135.29gC m2 day and 217.01 gC m2 day. The carbon content of G. verrucosa was 4.47 whileH. opuntia was 4.64. Based on the analysis of T test results, the potential of H.opuntia carbon absorption was significantly higher than G. verrucosa and the carbonstorage of H. opuntia was higher than G. verrucosa but not significant. In addition, ashcontent in H. opuntia is higher than G. verrucosa while H. opuntia water content islower than G. verrucosa. It is because H. opuntia stores more carbon in the form ofcalcium carbonate. Therefore, conservation efforts can be done on high potential macroalgaein carbon sinks and storage such as H. opuntia to reduce carbon emissions fromthe atmosphere.

Abstrak :
Spirulina platensis memiliki kemampuan adaptabilitas yang tinggi terhadap berbagai lingkungan sehingga spesies ini memiliki potensi untuk dikembangkan dalam skala besar. Selain itu Spirulina platensis memiliki kandungan protein yang besar yaitu, 65,7%. Salah satu protein yang bernilai tinggi, memiliki sifat antioksidan dan antiinflamasi yang berpotensi dikembangkan untuk industri farmasi. Proses produksi biomassa pada mikroalga dibutuhkan sistem kultivasi yang sesuai untuk mendukung pertumbuhan sel dengan proses fotosintesis. Pada proses ini, mikroalga Spirulina platensis memanfaatkan energi cahaya menjadi energi ATP untuk pertumbuhan dan pembentukan senyawa karbon dengan proses fiksasi CO2. Cahaya merupakan parameter operasi penting dalam sistem kultivasi mikroalga. Pada penelitian sebelumnya yang telah ada mengenai kultivasi mikroalga Spirulina platensis menggunakan lampu biru meningkatkan produksi pigmen protein fikosianin dan klorofil-a. Namun, peninjauan terhadap ukuran inokulum yang sesuai dengan intensitas lampu untuk meningkatkan produktivitas dan efisiensi energi belum banyak diteliti. Pada penelitian ini ukuran inokulum menjadi variabel yang ditinjau untuk mendapatkan intensitas cahaya optimum. Hasil biomassa yang diproduksi dengan pencahayaan alterasi akan diuji kandungan karbon, fikosianin, klorofil. Laju pertumbuhan spesifik mikroalga Spirulina platensis diolah dengan menggunakan pendekatan Monod. Laju pertumbuhan maksimum didapatkan oleh Laju pertumbuhan maksimum yang paling tinggi didapatkan oleh kultur dengan pencahayaan lampu putih pada 5000 lux dengan laju spesifik maksimum 0,0196/jam. Konsentrasi fikosianin dan klorofil tertinggi didapatkan pada lampu biru dengan konsentrasi masing-masing 0,236 dan 0,183 mg/mg alga ......Spirulina platensis has high adaptability to various environments so this species has the potential to be developed on a large scale. Apart from that, Spirulina platensis has a large protein content, namely 65.7%. One of the high-value proteins, it has antioxidant and anti-inflammatory properties that have the potential to be developed for the pharmaceutical industry. The biomass production process in microalgae requires a suitable cultivation system to support cell growth through the photosynthesis process. In this process, the microalgae Spirulina platensis utilizes light energy into ATP energy for growth and the formation of carbon compounds using the CO2 fixation process. Light is an important operating parameter in microalgae cultivation systems. In previous research, the cultivation of the microalga Spirulina platensis using blue light increased the production of the protein pigments phycocyanin and chlorophyll-a. However, reviewing the appropriate inoculum size for light intensity to increase productivity and energy efficiency has not been widely studied. In this study, inoculum size was the variable considered to obtain optimum light intensity. The biomass produced by alternating lighting will be tested for carbon, phycocyanin and chlorophyll content. The specific growth rate of the microalga Spirulina platensis was processed using the Monod approach. The maximum growth rate was obtained by The highest maximum growth rate was obtained by culturing with white light lighting at 5000 lux with a maximum specific rate of 0.0196/hour. The highest concentrations of phycocyanin and chlorophyll were obtained in blue light with concentrations of 0.236 and 0.183 mg/mg algae respectively.