Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Journal of Ecological Engineering

2 2023

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: Albizia saman

Sortuj według:

Ogranicz wyniki do:

The Effects of the Growth Regulator Paclobutrazol on Physiological Characteristics of Rain Tree (Albizia saman Jacq. Merr.)

Fathurrahman F., Zahrah Siti, Ernita, Heriyanto, Mahadi Imam

Journal of Ecological Engineering

2023

Vol. 24, nr 12

346--355

The increase of carbon dioxide (CO2) has been identified since the industrial revolution era. Albizia saman is a tree species which can absorb excess CO2 from the atmosphere in large quantities. This study was to identify the effect of spraying time and concentration of paclobutrazol on the growth of A. saman seedlings. This research using a completely randomized design, the first factor is spraying time which is divided into three levels: spraying at age of 25, 50 and 75 days. The second one is the concentration of paclobutrazol, consisting of four levels: control, 75, 150 and 225 mol•L-1. The further test used are DMRT at p<0.05. Paclobutrazol influences the higher rate of photosynthesis, namely 38.27 M CO2 m-2s-1. There are varied stomatal conductance values, where the highest value is 0.35 mM m-2s-1 and the lowest carbon dioxide content in treatment is 56.86 mol•L-1. The slowest transpiration rate is the combination of 50 days after treatment, and the concentration of paclobutrazol is 0.24 mM H2O m-2s-1. The shortest growth of A. saman is shown from the 50-day treatment using paclobutrazol and 150 mol•L-1 concentration. The relationship between photosynthetic rate and stomatal conductance and transpiration concludes that the trend is similar to that of the curve, whereas the trend is not the same as the internal CO2.

Effects of Carbon Dioxide Concentration on the Growth and Physiology of Albizia saman (Jacq.) Merr

Fathurrahman F.

Journal of Ecological Engineering

2023

Vol. 24, nr 9

302--311

This study was conducted to determine the effects of CO2 concentration on the growth and physiology of rain tree (Albizia saman (Jacq.) Merr), by increasing the CO2 concentration in a greenhouse automated system. The objective of this study was to evaluate the response of rain tree to CO2 in terms of growth and physiology. CO2 at an average concentration of 800 μmol mol-1 was injected daily for 2 h from 9 am to 11 am. The seedlings were placed in a greenhouse during the control trial with a mean ambient CO2 concentration of 400 μmol mol-1. In this study, the entire randomised block design has been applied, and growth was observed every 30 days for 120 days. Almost all seedling growth parameters were significant under elevated and ambient concentrations. The leaf area in the control samples (400 ppm of CO2) was 243.37 cm2, and this value increased to 277.30 cm2 in the sample treated with 800 ppm of CO2. The biomass increased, and the original wet weight ratio and root dry weight of the canopy and the principal (9.06 and 10.12 g, respectively) increased to 9.7 and 16.06 g, respectively, after treatment. Physiology was analysed in terms of relative levels of photosynthesis, stomatal conductance and water use efficiency (WUE). Such parameters increased in the principal treatment of CO2 (800 ppm), whilst the CO2 content and transpiration levels declined. As the CO2 concentration increased, the value of the levels of photosynthesis and stomatal conductance in both samples increased. As the photosynthesis levels increased, the WUE activity increased. However, as photosynthesis levels decreased, the WUE activity also decreased. Transpiration levels but also rely on a certain age if the increased photosynthesis WUE has decreased.