Judul: Analisis laju infiltrasi pada berbagai tingkat penutupan lahan areal hutan jati (Tectona grandis, L.f.) : Studi kasus di RPH Tanggulun, BKPH Kalijati, KPH Purwakarta
Abstrak: Laju infiltrasi dipengaruhi oleh berbagai faktor yang bersifat kompleks antara lain: macam penutupan lahan, keadaan tanah dan lahan, serta kombinasinya. Macam penutupan lahan berkolerasi positif dengan laju infiltrasi. Hal ini ditunjukkan oleh jenis dan kerapatan vegetasi domínan, daya transpirasi dan daya penetrasi akar yang tinggi berpengaruh terhadap cepatnya laju infiltrasi. Disamping itu tipe penutupan lahan berpengaruh positif terhadap laju infiltrasi. Secara umum, keadaan tanah dan lahan berkolerasi positif dengan laju infiltrasi. Berdasarkan data pengamatan tanah dan lahan dilapangan secara morfologik dan didukung oleh data analisis laboratorium, maka secara morfogenesis tanah didaerah penelitian diklasifikasikan sebagai Tanah Mediteran Coklat (Humic Eutrudept) dan Latosol Coklat (Umbric Dystrudept). Tanah Mediteran Coklat berbahan induk batuan sedimen (napal), susunan horison A-B-C (batas-batas horison jelas, besolum dalam (60-90 cm) berwarna coklat, kandungan C-organik tinggi (>1,2 %), tekstur liat, struktur gumpal bersudut, kemantapan agregat rendah, peka terhadap erosi, konsistensi tegak (lembab), pori-pori mikro banyak, drainase baik dan laju infiltrasi tergolong agak lambat dan sangat lambat. Latosol Coklat berbahan induk batuan volkanik (andesit), susunan horison A-B-C, solum sangat dalam (>100 cm), berwarna coklat kandungan C-organik tinggi (>1,2%), tekstur liat, struktur gumpal samapia remah, konsistensi sangat gembur (lembab), pori-pori makro banyak, zone perakaran dalam drainase baik, kemantapan agregat tinggi, tidak peka erosi, laju infiltrasi cepat. Kombinasi antara macam penutupan lahan dan macam tanah serta pengaruhnya terhadap laju infiltrasi mengindikasikan suatu fenomena yang menarik dalam pengelolaan khususnya hutan jati fenomena tersebut antara lain:...
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Judul: Analisis laju infiltrasi pada berbagai tingkat penutupan lahan areal jati (Tectona grandis, I.)
Abstrak: Laju infiltrasi dipengaruhi oleh berbagai faktor yang bersifat kompleks antara lain: macam penutupan lahan , keadaan tanah dan lahan, serta kombinasinya. Macam penutupan lahan berkolerasi positif dengan Jaju infiltrasi. Hal ini diturJukkan oleh jenis dan kerapatan vegetasi dominan,daya transpirasi dan daya penetrasi akar yang tinggi berpengaruh terhadap cepatnya laju intiltrasi. Disamping itu tipe penutupan lahan berpengaruh positifterhadap laju infiltrasi.
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Judul: Bioelectricity Production from Citrobacter freundii GBH253 and Chlorella pyrenoidosa on Microbial Fuel Cell Anode with Different Carbon Sources
Abstrak: Microbial Fuel Cell (MFC) development has significantly increased from various aspects to get higher and more stable electricity. Developing MFC on microorganism aspect is very important because it plays a crucial role in the MFC system. C. freundii GBH253 is one of the potential exoelectrogen bacterium that could be developed for the MFC system. Integrating C. freundii GBH253 and electricity-producing microalgae, such as C. pyrenoidosa, in the anode of MFC could get more stable and higher electricity. In this study, C. freundii GBH253 and C. pyrenoidosa were coupled to produce electricity from different substrates. C. freundii GBH253 and C. pyrenoidosa were tested on three different media types before being tested on MFC. They were also examined for the co-cultivation test to determine the symbiotic relationship between the two microorganisms. The MFC test was conducted using the Randomized Block Design Factorial and the Tukey test to see significant differences from each treatment. The parameters observed in this study were voltage, power density, Chemical Oxygen Demand (COD), Coulombic Efficiency (CE), pH, and volatile fatty acid (VFA). C. freundii GBH253 cannot grow on microalgae medium, while C. pyrenoidosa could grow on bacterial medium and a mixture of bacterium and microalgae media. The bacterium gained benefit from co-culture with microalgae. In the MFC test, electricity was generated in all treatments, which bacterium + microalgae with acetate treatment could generate power density up to 211,97 mW/m2 and the most stable compared to others. Production of electricity in bacterium-microalgae combination dominated by the bacterium; hence, microalgae still help bacterium by producing electricity and raised the COD value. The pH value of all treatments was higher than the initial pH. Acetate and phenol were VFA produced in all treatments, whereas butyric acid and propionic acid were found in some treatments. Pearson correlation showed that some VFA highly correlated with power density.
Keyword: Chlorella pyrenoidosa, Substrate, Microbial Fuel Cell, Electricity Producing Microalgae, Volatile Fatty Acid, Citrobacter freundii