Evolution of Autumn Leaf Coloration of Torminalis glaberrima Grown in Isparta, Türkiye

Year 2023, , 101 - 108, 10.01.2024

Candan Şahin , Ebru Hatice Tığlı Kaytanlıoğlu , Hüseyin Fakir , Uğur Özkan

https://doi.org/10.26650/JGEOG2023-1257031

Abstract

The fall coloration of temperate tree leaves is a phenomenon of nature that ranges in color from pale yellows, oranges, and purples to dark reds. Although some evolutionary forces and weathered mechanisms (e.g., light and frost protection) cause variations in leaf color within and among species, no full explanation is found regarding fall coloration. This study phonologically monitored Torminalis glaberrima leaves from May until at the end of November in terms of fall coloration and senescence properties. The study presents the average color coordinate values of Torminalis glaberrima leaves, starting from May and continuing through November. Torminalis glaberrima leaves show an intense green color from May to June. We have used CIE L*a*b (1976) color space to determine discoloration intensity. As the seasons change, however, the leaves become darker into November (L = 25.67), with leaf discolorations becoming clearly distinguishable. We selected color values of leaves of Torminalis glaberrima at May as control, and as vegetation continues, compared to color changes throughout study (end of November). Accordingly, we measured total color differences (ΔE). The highest change in coloration was found in November (ΔE = 56.86) followed by October (ΔE = 44.71), September (ΔE = 42.32), August (ΔE = 15.37), July (ΔE = 5.86), and June (ΔE = 2.14). Notably, the highest color difference ΔE = 44.56 was found from August to September, and the lowest from May to June (ΔE = 2.14). Except for the leaves’ GE brightness values, which show very low correlations over time, all other color coordinate values for CIE L*a*b* and hue values show some color level correlations over time.

Keywords

CIE L*a*b*, Torminalis glaberrima leaves, autumn coloration, leaf senescence

Project Number

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Isparta-Türkiye’de Yetişen Torminalis glaberrima’nın Sonbahar Yaprak Renklenmesinin İncelenmesi

Abstract

Ilıman iklim bölgelerinde yetişen ağaçların yaprakları, sonbaharda bir olgu olarak parlak sari renkten turuncu, pembe ve koyu kırmızı renge kadar karmaşık renklenme göstermektedir. Hernekadar bazı evrimsel güçler ve dış atmosferik şartlar (ışık ve don koruması) yapraklarda renk değişimine sebep olmakla birlikte, bu durum türler arasında farklılık göstermekte ve hala tam olarak açıklanabilmiş değildir. Bu çalışamda, torminalis glaberrima yapraklarının sonbahar renklenmesi ve yaşlanma durumu, fenolojik olarak Mayıs ayından Kasım sonuna kadar izlenmiştir. Torminalis glaberrima yapraklarının renk değerleri, Mayıs ayından başlayarak Kasım ayı sonuna kadar karşılaştırmalı olarak sunulmuştur. Torminalis glaberrima’nın yaprakları Mayıstan Haziran sonuna kadar koyu Yeşil renk tonunda gözlemlenmiş ve zaman ilerledikçe Kasımda daha koyu renge dönmüştür (L: 25.67 nümerik). Zamana bağlı olarak oluşan yapraklardaki renk değişimi kolaylıkla gözşlemlenebilmiştir. En yüksek renk değişimi, Kasımda (ΔE: 56.86), devamında Ekimde (ΔE: 44.71), Eylülde (ΔE: 42.32), Ağustosta (ΔE: 15.37), Temmuzda (ΔE: 5.86) ve Haziranda (ΔE: 2.14) ölçülmüştür. Fakat en yüksek renk farklılığı ise ΔE: 44.56 numerik olarak, Ağustostan Eylüle kadar olan periyotta en düşük ise Maytıstan Hazirana kadar (ΔE: 2.14) olan periyotta oluşmuştur. GE parlaklık değeri zamana bağlı olarak çok düşük korelasyon göstermekte ve istisna oluşturmakta, fakat diğer tüm renk koordinasyon değerleri olan CIE L*a*b*C* ve h nin, zamana bağlı olarak bir şekilde korelasyon gösterdiği anlaşılmıştır.

Keywords

CIE L*a*b*, torminalis glaberrima, sonbahar renklenmesi

Supporting Institution

yok

Project Number

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Thanks

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