Effect of Biochar on Physiological Characteristics of European Yew (Taxus baccata) Seedling in Different Light Intensities

Document Type : Original Research

Authors
M. Rezaei Karmozdi 1
M. Tabari Kouchaksaraei 2
S. E. Sadati 3
1 Department of Forest Science and Engineering, Faculty of Natural Resources, Tarbiat Modares University, Noor, Iran
2 Department of Forest Science and Engineering, Faculty of Natural Resources, Tarbiat Modares University
3 Associate Prof., Research Division of Natural Resources, Mazandaran Agricultural and Natural Resources Research and Education Center, AREEO, Sari, Iran
Abstract
Aim This investigation aims to study the effect of biochar on gas exchange, water relations and photosynthetic pigments of European yew (Taxus baccata) seedling in different light intensities (LI).

Materials and Methods Two-year potted seedlings of European yew are placed in forest stands with canopies of closed (15% LI), semi-closed (45% LI) and open (75% LI). In late June 2018, biochar was added to potted soils at the levels of zero, 10, 20 and 30 g.kg-1 and until the end of November, every 3 (or 4) days 100 mL water was given to each pot.

Findings Seedling survival at different levels of treatments was 100%. Regardless of biochar, the highest photosynthesis, stomatal conductance, intercellular CO2 concentration, relative water content, chlorophyll (chl) contents in closed canopy, and the highest leaf temperature in open canopy was observed. With increasing biochar concentration, chl b and total chl increased (28-86%, respectively) in open canopy and decreased (28 and 28%, respectively) in closed canopy. Neither biochar nor LI affected significantly electrolyte leakage and carotenoid content.

Conclusion Although yew seedlings were able to maintain their vegetative quality and health in different LI, and the measured variables responded differently to light-biochar combination, it may be best to grow yew in shade together with biochar. Since, the effect of biochar becomes more tangible over time, further research in next years can lead to more accurate findings affected by the combined light-biochar treatment.
Keywords
Carotenoid
Electrolyte leakage
Relative water content
Stomatal conductance
total chlorophyll

Subjects

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