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KEPENTINGAN/PERANAN CAHAYA : Mempertahankan suhu Proses fotosintesis

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Presentasi berjudul: "KEPENTINGAN/PERANAN CAHAYA : Mempertahankan suhu Proses fotosintesis"— 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 Sumber: Max Planck Institut For Meteorology (1999)
Siklus hidrologi Sumber: Max Planck Institut For Meteorology (1999) S2 Produktivitas Perairan

3 PANJANG GELOMBANG ( λ ) : 100 – 3.000 nm (10-9m)
< 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:
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). S2 Produktivitas Perairan

5 LUX METER, PYRHELIOMETER ALBEDOMETER PHOTOCELL IMMERGEABLE
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 datang pantul α1 α2 α1 = α2 α1 > α3 α3 bias SCATTERING S2 Produktivitas Perairan

7 CAHAYA DARI MATAHARI (%) YANG SAMPAI KE BUMI
Total ; Asal Hilang ; Asal Sisa ; Asal Luar Atmosfir 100 ; 100 48 ; 48 52 ; 52 Atmosfir 100 ; 52 60 ; 31 40 ; 21 Permukaan air 100 ; 21 50 ; 10,5 Dari matahari : 1,92 gcal/cm2/menit Daerah ekuator : gcal/cm2/hari Kutub pada musim panas : gcal/cm2/hari S2 Produktivitas Perairan

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

9 Iz = I0.e-kz dikalikan Ln Ln Iz = Ln Io.e-kz = Ln Io + Ln e-kz
= Ln Io – kz Ln e (Ln e = 1) = Ln Io – kz Ln Iz + kz = Ln Io Kz = Ln Io – Ln Iz S2 Produktivitas Perairan

10 Kz = Ln Io – Ln Iz Depth (m) Nilai Cahaya (%) Ln K 100 4,61 0,16 2 86
100 4,61 0,16 2 86 4,45 0,15 4 74 4,30 0,52 6 44 3,78 8 38 3,63 0,14 10 33 3,49 Jumlah 1,12 S2 Produktivitas Perairan

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

12 Pukul Cahaya di permukaan Cahaya di kedalaman 5 m
% Lux 08 100 1 10 500 5 12 1.000 14 900 9 Misalnya agar fotosintesis = respirasi diperlukan cahaya 5 lux S2 Produktivitas Perairan

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

14 Hamparan alga dan terumbu 2.500 Estuari tanpa rawa (marsh) 1.500
RATA-RATA NILAI PRODUKSI PRIMER BERSIH BERBAGAI LINGKUNGAN (Valiela, 1984) Lingkungan g/m2 /Tahun Laut Terbuka 125 Upwelling 500 Continental shelf 300 Hamparan alga dan terumbu 2.500 Estuari tanpa rawa (marsh) 1.500 Total Laut (marine) 4.925 Terrestrial (daratan) 737 Rawa (swamp and marsh) 3.000 Danau dan sungai 400 Total kontinental 4.137 S2 Produktivitas Perairan

15 Images from Purves et al
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 Chlorophyll Chlorophylls
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). S2 Produktivitas Perairan

17 http://users. rcn. com/jkimball. ma
 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

19 http://www. globalchange. umich
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20 THE LIGHT REACTIONS OF PHOTOSYNTHESIS
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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 S2 Produktivitas Perairan
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 16680 Telp.Facs HP S2 Produktivitas Perairan


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