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KEPENTINGAN/PERANAN CAHAYA : Mempertahankan suhu Proses fotosintesis Siklus hidrologi SATUAN CAHAYA : Watt, Joule, Lux, Langley, Kalori Foot candle, S2.

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Presentasi berjudul: "KEPENTINGAN/PERANAN CAHAYA : Mempertahankan suhu Proses fotosintesis Siklus hidrologi SATUAN CAHAYA : Watt, Joule, Lux, Langley, Kalori Foot candle, S2."— Transcript presentasi:

1 KEPENTINGAN/PERANAN CAHAYA : Mempertahankan suhu Proses fotosintesis Siklus hidrologi SATUAN CAHAYA : Watt, Joule, Lux, Langley, Kalori Foot candle, S2 Produktivitas Perairan

2 Siklus hidrologi Sumber: Max Planck Institut For Meteorology (1999) S2 Produktivitas Perairan

3 PANJANG GELOMBANG ( λ ) : 100 – nm (10 -9 m) < 300 nm : Ultra Violet 300 – 700 nm : PAR – Photosynthetic Active Radiation Visible Light 300 – 490 nm Biru 490 – 585 nm Hijau 585 – 700 nm Merah 555 nm Kuning Hijau, Pusat Cahaya > 700 nm : Infra Red S2 Produktivitas Perairan

4 The electromagnetic spectrum. Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com). The electromagnetic spectrum: S2 Produktivitas Perairan

5 ALAT PENGUKUR CAHAYA : LUX METER, PYRHELIOMETER ALBEDOMETER PHOTOCELL IMMERGEABLE SECCHI DISK/DISC S2 Produktivitas Perairan

6 Penurunan cahaya karena : 1. Refleksi – dipantulkan 2. Absorpsi – diserap Refleksi + Absorpsi + Transmisi = 1 3. Transmisi – Dibiaskan datangpantul bias α1α1 α2α2 α3α3 α 1 = α 2 α 1 > α 3 SCATTERING S2 Produktivitas Perairan

7 CAHAYA DARI MATAHARI (%) YANG SAMPAI KE BUMI Total ; AsalHilang ; AsalSisa ; Asal Luar Atmosfir100 ; ; 4852 ; 52 Atmosfir100 ; 5260 ; 3140 ; 21 Permukaan air100 ; 2150 ; 10,5 Dari matahari : 1,92 gcal/cm 2 /menit Daerah ekuator : gcal/cm 2 /hari Kutub pada musim panas : gcal/cm 2 /hari S2 Produktivitas Perairan

8 Rumus LAMBERT-BEER I z = I o. e -kz z = Kedalaman I z = Intensitas cahaya pada kedalaman z I o = Intensitas cahaya pada kedalaman 0 (permukaan) e = Bilangan eksponensial k = Coeficient of Extinction, ( Koefisien Peredaman, Pemadaman, Peredupan) K z = K air + K Partikel Tersuspensi + K Diss.coll.compound Nilai K berbeda : Setiap Perairan Setiap Waktu Setiap Panjang Gelombang Setiap Kedalaman RUMUS LAMBERT-BEER I z = I o e -kz S2 Produktivitas Perairan

9 I z = I 0.e -kz dikalikan Ln Ln I z = Ln I o.e -kz = Ln I o + Ln e -kz = Ln I o – k z Ln e (Ln e = 1) = Ln I o – k z Ln I z + k z = Ln I o K z = Ln I o – Ln I z S2 Produktivitas Perairan

10 K z = Ln I o – Ln I z Depth (m)Nilai Cahaya (%) LnK 01004,61 0, ,45 0, ,30 0, ,78 0, ,63 0, ,49 Jumlah1,12 S2 Produktivitas Perairan

11 ZONASI VERTIKAL CAHAYA DI DALAM AIR Incident Light (%) DepthDepth Fotosintesis > Respirasi Fotosintesis = Respirasi Fotosintesis < Respirasi Compensation Depth ZONE PHOTIC ZONE APHOTIC S2 Produktivitas Perairan

12 PukulCahaya di permukaan Cahaya di kedalaman 5 m %Lux% Misalnya agar fotosintesis = respirasi diperlukan cahaya 5 lux S2 Produktivitas Perairan

13 KESUBURAN PERAIRAN DILIHAT DARI CAHAYA 1.Subur (Eutrophe) 0 – 3 m 2.Moderat/Sedang (Mesotrphe) 3 – 6 m 3.Miskin/tidak subur (Oligotrophe) >6 m Catatan : - Perairan Tawar - Kedalaman perairan > 6 m

14 RATA-RATA NILAI PRODUKSI PRIMER BERSIH BERBAGAI LINGKUNGAN (Valiela, 1984) Lingkungang/m2 /Tahun Laut Terbuka125 Upwelling500 Continental shelf300 Hamparan alga dan terumbu2.500 Estuari tanpa rawa (marsh)1.500 Total Laut (marine)4.925 Terrestrial (daratan)737 Rawa (swamp and marsh)3.000 Danau dan sungai400 Total kontinental4.137 S2 Produktivitas Perairan

15 Images from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com) S2 Produktivitas Perairan

16 Chlorophylls Two types of chlorophyll are found in plants and the green algae. ·  chlorophyll a, & ·  chlorophyll b The difference in their structures is shown in the figure (red disks). et/cfb/Photosynthesis.htm Chlorophyll S2 Produktivitas Perairan

17  the structure of beta-carotene, one of the most abundant carotenoids. Note: the system of alternating single and double bonds that in this molecule runs along the hydrocarbon chain that connects the two benzene rings.  Xanthophylls are essentially oxidized Carotenoids and contain oxygen. They are usually red and yellow and do not absorb energy as well as cartenoids. They are also fat soluble. S2 Produktivitas Perairan

18 S2 Produktivitas Perairan

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20 THE LIGHT REACTIONS OF PHOTOSYNTHESIS S2 Produktivitas Perairan

21 Figure 2. Absorption spectrum of isolated chlorophyll and carotenoid species. The color associated with the various wavelengths is indicated above the graph. S2 Produktivitas Perairan

22 ENAN M ADIWILAGA Lantai 2 Wing 14 (N) Nomor 2 – Menghadap ke danau Telp. Facs Rumah : Jl Soka No 18 Kampus IPB Darmaga (Perumdos) Bogor Telp.Facs HP S2 Produktivitas Perairan


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