scholarly journals Dinamika fluks CO2 pada perkebunan kelapa sawit di lahan gambut

2021 ◽  
Vol 11 (3) ◽  
pp. 430-441
Author(s):  
M. Joehari Jamili ◽  
Budi Nugroho ◽  
Basuki Sumawinata ◽  
Syaiful Anwar
Keyword(s):  
Gas Analyzer ◽  
Infra Red

Fluks CO2 pada perkebunan kelapa sawit di lahan gambut bersifat dinamis secara temporal dan spasial, yang berhubungan dengan berbagai faktor lingkungan. Fluks ini dapat dibedakan menjadi fluks dari respirasi akar, dari dekomposisi serasah, dan dari bahan gambut. Penelitian ini bertujuan untuk menetapkan dinamika temporal dan spasial fluks CO2, kontribusi respirasi akar dan dekomposisi serasah terhadap fluks, serta hubungannya dengan faktor lingkungan pada perkebunan kelapa sawit di lahan gambut. Pengukuran fluks CO2 menggunakan infra red gas analyzer (IRGA) yang dilakukan di gawangan hidup, gawangan mati dan lahan semak belukar. Pengukuran fluks dilakukan secara berulang setiap tiga hingga empat hari selama hampir lima bulan. Hasil penelitian memperlihatkan adanya dinamika temporal dan spasial. Secara temporal, fluks CO2 pada perkebunan kelapa sawit dan semak belukar berada pada kisaran 2.9 – 11.1 dan 0.5 – 6.4 g C-CO2/m2/hari. Secara spasial, fluks CO2 pada perkebunan kelapa sawit dan semak belukar berada pada kisaran 4.8 – 8.8 dan 2.7 – 3.4 g C-CO2/m2/hari. Kontribusi perakaran tanaman kelapa sawit dan dekomposisi serasah terhadap fluks sebesar 48.4 dan 5.8%. Hasil ini semakin menegaskan bahwa perakaran tanaman berperan penting terhadap pelepasan karbon dari permukaan tanah.

scholarly journals Physiological Parameters of Soybean Under Different Intensities of Artificial Light

2019 ◽  
Vol 11 (8) ◽  
pp. 188
Author(s):  
Lucas Aparecido Manzani Lisboa ◽  
Amanda Stelutti ◽  
Karla Caroline Santana Lima ◽  
Guilherme Bandeca Rafachinho ◽  
Renata Alari Chedid ◽  
...  
Keyword(s):  
Light Intensity ◽  
Co2 Concentration ◽  
Co2 Assimilation ◽  
Physiological Parameters ◽  
Artificial Light ◽  
Gas Analyzer ◽  
Infra Red ◽  
Glycine Max L ◽  
Use Efficiency ◽  
The Ideal

Luminosity and temperature are factors that directly act in photosynthetic process, in which the elevation of the light intensity may provoke reduction in the assimilation of carbon, impairing the development of the soybean culture. This work aimed to know physiological parameters of soybean (Glycine max L. Merr.) under different intensities of artificial light. The experiment was carried out in randomized blocks, in a factorial scheme 2 × 5, being two soybean cultivars (Potência and NS6700) and five densities of light: 0 (control), 500, 1000, 1500 and 2000 μmol m-2 s-1 of photosynthetically active radiation (PAR) provided by LED bulbs, with 4 repetitions, in total of 40 plots. The following variables were set: rate of CO2 assimilation (A), transpiration (E), stomatal conductance (gs), inner CO2 concentration in the substomatic chamber (Ci) and water use efficiency (WUE) in which a portable device of gas exchange was used (Infra-Red Gas Analyzer-IRGA, marca ADC BioScientific Ltd, modelo LC-Pro). Seedlings of soybean positively responded under different intensities of artificial light till reach the maximum saturation point between 1400 and 1600 µmol m-1 s-1 of light, which promoted a better rate of A, Ci andWUE. E and gs presented positive linear responses by increasing the intensity of artificial light. The ideal light intensity to the use of Infra-Red Gas Analyzer-IRGA between 1400 and 1600 µmol m-1 s-1 to the soybean culture.

scholarly journals Wplyiu niektórych herbicydów na fotosyntezę Spirodela polyrrhiza (Lemnaceae) [Effect of some herbicides on photosynthesis of Spirodela polyrrhiza (Lemnaceae)]

2015 ◽  
Vol 29 (1) ◽  
pp. 59-68 ◽  
Author(s):  
Krzysztof Bielecki ◽  
Henryk Skrabka
Keyword(s):  
Gas Analyzer ◽  
Spirodela Polyrrhiza ◽  
Infra Red ◽  
Herbicide Concentration

The effect of herbicides Afalon (linuron), CIPC, Gramoxone (paraquat), Krezamon (DNOC), Pielik (2,4-D • Na), Simazin (simazine) on photosynthesis of <i>Spirodela polyrrhiza (Lemnaceae)</i> was investigated with infra-red gas analyzer Infralyt III. Herbicides: Afalon, Gramoxone, Simazine inhibited photosynthesis, proportionally to used herbicide concentration. Krezamon inhibited CO<sub>2</sub> exchange directly after application, but later on photosynthesis increased. 2,4-D • Na and CIPC have no effect on photosynthesis even in higher concentrations.

scholarly journals Analysis of gas exchange in trees of the Caatinga, Brazil

2019 ◽  
Vol 10 (4) ◽  
pp. 21-35
Author(s):  
Joaci Dos Santos Cerqueira ◽  
Helder Neves de Albuquerque ◽  
Mário Luiz Farias Cavalcanti ◽  
Francisco De Assis Salviano de Sousa
Keyword(s):  
Gas Exchange ◽  
Semiarid Region ◽  
Gas Analyzer ◽  
Tukey Test ◽  
Botanical Species ◽  
Spad Value ◽  
Brazilian Semiarid ◽  
Infra Red ◽  
High Level ◽  
Aspidosperma Pyrifolium

In the Brazilian semiarid region, the high temperatures in association with the high level of solar radiation and variations in the concentration of CO2 which of focus on plants may influence the physical conformation of vegetables and their growth. On the basis of the above, the objective of this work to evaluate the content of gas exchange and chlorophyll in plants typical of Caatinga, associating possible interference of the power plant Borborema thermal S/A. the study carried out in the period of 2014-2018 with botanical species in two areas of the caatinga of Paraiba. To analyze the variables used the infra Red Gas Analyzer (RGA) and the SPAD. In using SPAD equipment it was found that the species had higher SPAD value were Aspidosperma pyrifolium Mart., (SPAD=50) P300. As the analyzes of gas exchange by the LCpro+, obtained greater record in plant Aspidosperma pyrifolium Mart. In point (P400). The maximum values of E and points were recorded (P600) (E=3.44>335 mmol.H2O.m-².s-¹) and (P100) (E=3.16mmol.H2O.m-².s-¹), both second collection. The first collection the highest registered was E=2.30mmol.H2O.m-².s-¹ (P600), Ziziphus species Joazeiro. In relation of the Tukey test, it was found that the transpiration of tree species, were higher in the second collection, the range of confidence (a, b) were significantly different. It was concluded that the indexes were higher by SPAD the occasion of the 2ª collection. The Ci presented low variation between the two periods. It was so, a non-correlation between the collections and areas surveyed.

scholarly journals Emisi Karbondioksida (CO2) Lahan Gambut Pasca Kebakaran Tahun 2018 di Kota Pontianak

2020 ◽  
Vol 18 (2) ◽  
pp. 384-391
Author(s):  
Shandra Andina Rahsia ◽  
Evi Gusmayanti ◽  
Rossie Wiedya Nusantara
Keyword(s):  
Gas Analyzer ◽  
Infra Red

Lahan gambut di Kota Pontianak sering mengalami kebakaran yang berulang hampir setiap tahun. Tutupan lahan gambut yang terbakar beragam, mulai dari semak belukar hingga kebun masyrakat seperti akasia, kelapa sawit dan kebun campuran. Selain melepaskan emisi CO2 pada saat kebakaran berlangsung, lahan gambut yang mengalami perubahan fisik dan kimia akibat kebaarakan dapat mempengaruhi jumlah emisi CO2 yang dilepaskan ke atmosfer pasca terjadinya kebakaran.  Penelitian ini bertujuan untuk mengukur jumlah emisi CO2 pada lahan gambut yang terbakar pada pertengahan tahun 2018 di Kota Pontianak serta menganalisis korelasinya dengan beberapa faktor lingkungan. Penelitian dilakukan pada bulan Mei- Juli 2019 di Kota Pontianak Provinsi Kalimantan Barat pada lahan gambut pasca kebakaran dengan vegetasi awal berupa tanaman akasia dan vegetasi saat dilakukan penelitian berupa semak belukar. Pengukuran Emisi CO2 menggunakan metode sungkup tertutup dengan alat ukur portable EGM 4 (Infra Red Gas Analyzer). Selain itu dilakukan pula pengambilan sampel tanah untuk menganalisis beberapa karakteristik fisik (bobot isi, kadar air gravimetrik, muka air tanah) dan kimia gambut ( kandungan bahan organik, kadar abu, kadar C Organik, pH dan Eh tanah) serta pengukuran variabel lingkungan (suhu udara dan suhu tanah). Hasil penelitian menunjukan bahwa nilai fluks CO2 pada selama periode pengukuran berkisar dari 183 – 595 ton CO2 dengan rerata sebesar 416,07 t CO2 ± 92,99 . Emisi CO2 ini berkorelasi tidak nyata dengan variabel lingkungan. Selain mengindikasikan kompleksitas proses dekomposisi gambut sebagai penghasil emisi CO2 di lahan pasca kebakaran yang tidak dapat dikaitkan dengan variabel lingkungan tertentu, hal ini menunjukkan perlunya melakukan pengukuran dalam jangka waktu yang lebih panjang agar pola emisi dapat terlihat.

Sink-Source Relations in Cassava: Effects of Reciprocal Grafting on Yield and Leaf Photosynthesis

1994 ◽  
Vol 30 (3) ◽  
pp. 359-367 ◽  
Author(s):  
Didier Pellet ◽  
Mabrouk A. El-Sharkawy
Keyword(s):  
Leaf Gas Exchange ◽  
Sink Strength ◽  
Root Number ◽  
Leaf Photosynthesis ◽  
Gas Analyzer ◽  
Root Yield ◽  
Storage Roots ◽  
Area Index ◽  
Single Leaf ◽  
Infra Red

SUMMARYTwo contrasting clones of cassava (Manihot esculenta) were reciprocally grafted to test the hypothesis that the yield of cassava is limited by the number of storage roots. Effects of the root sink on leaf gas exchange were also tested under field conditions using a portable infra-red gas analyzer. Storage root number and root yield were affected by stock size and root yield was associated with the number of storage roots. The harvest index and sink-source ratio (root numberz/leaf area index) were correlated with root number. A feedback effect of root number on single-leaf photosynthesis was observed in one clone. It is concluded that the number of storage roots may be used as an indicator of sink strength.

scholarly journals C02 Evolution Rate Decrease of Anthuriums as Affected in Storage

1969 ◽  
Vol 68 (3) ◽  
pp. 269-274
Author(s):  
Anand D. Sharma
Keyword(s):  
Carbon Dioxide ◽  
Evolution Rate ◽  
Commercial Variety ◽  
Gas Analyzer ◽  
Carbon Dioxide Evolution ◽  
Rate Decrease ◽  
Infra Red

An investigation of the comparative carbon dioxide evolution rates of cut anthuriums was conducted with the Infra-Red Gas Analyzer. Only one major commercial variety, Kaumana, was used with the test flowers classified into four commercial sizes: large, medium, small, and miniature. The rate of carbon dioxide evolution from all flowers decreased logarithmically during the 16 days in storage.

A Rapid Infra‐Red Gas Analyzer

1949 ◽  
Vol 20 (3) ◽  
pp. 175-178 ◽  
Author(s):  
Richard C. Fowler
Keyword(s):  
Gas Analyzer ◽  
Infra Red
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