Assessment of radial growth and tree water deficit in Cedrus libani, Juniperus excelsa, and Pinus brutia using high-precision dendrometers

Aylin Güney; Fatma Gökçe Cankara; Burak Bahar

Article Details

Assessment of radial growth and tree water deficit in Cedrus libani, Juniperus excelsa, and Pinus brutia using high-precision dendrometers

Authors:

Aylin Güney | Fatma Gökçe Cankara | Burak Bahar

Publisher:

Isparta University of Applied Sciences

Main Topics:

Ağaç Beslenme ve Fizyolojisi

Journal:

Turkish Journal of Forestry Vol.25 Issue 2, pp.166-175

Document Type:

Article

Publication Date:

6/2024

Document Language:

Turkish

Document ID (Org No.):

2001317856

pISSN:

2149-3898

Keywords:

Abstract:

 Data obtained from continuous measurements of high-precision dendrometers offer information about radial stem growth and tree water relations in high resolution. In 2022, two long-term monitoring sites were established in Antalya as part of the DenTRo initiative: Point dendrometers were installed to measure stem radius changes in a mixed Cedrus libani Taurus cedar- Juniperus excelsa Greek juniper stand in the Elmalı Cedar Research Forest and in a pure Pinus brutia Turkish pine stand in the Bük Lütfü Büyükyıldırım Research Forest. This work presents the first results of stem radius change measurements covering the growing season of 2022. Seasonal dynamics of radial growth were modeled by Gompertz functions. Further, radial stem growth GRO and tree water deficit-induced stem shrinkage TWD were extracted from hourly stem radius change measurements, investigated for their patterns, and correlated with environmental variables. Radial stem growth in Turkish pine started in the first week of April, approximately three weeks earlier than cedar and juniper. Maximum GRO was also reached earlier in Turkish pine. In all three species, main stem growth happened before July after which all experienced longer periods of water limitations as measured by increasing TWD. Relative air humidity had a stronger positive effect on GRO in cedar and juniper, while in pine GRO and TWD were strongly positively correlated with precipitation and high temperatures, respectively. To provide more detailed and comprehensive information on how trees are affected by climate change, long-term monitoring sites in different forest ecosystems using ecophysiological methods such as dendrometers are needed.

 Data obtained from continuous measurements of high-precision dendrometers offer information about radial stem growth and tree water relations in high resolution. In 2022, two long-term monitoring sites were established in Antalya as part of the DenTRo initiative: Point dendrometers were installed to measure stem radius changes in a mixed Cedrus libani Taurus cedar- Juniperus excelsa Greek juniper stand in the Elmalı Cedar Research Forest and in a pure Pinus brutia Turkish pine stand in the Bük Lütfü Büyükyıldırım Research Forest. This work presents the first results of stem radius change measurements covering the growing season of 2022. Seasonal dynamics of radial growth were modeled by Gompertz functions. Further, radial stem growth GRO and tree water deficit-induced stem shrinkage TWD were extracted from hourly stem radius change measurements, investigated for their patterns, and correlated with environmental variables. Radial stem growth in Turkish pine started in the first week of April, approximately three weeks earlier than cedar and juniper. Maximum GRO was also reached earlier in Turkish pine. In all three species, main stem growth happened before July after which all experienced longer periods of water limitations as measured by increasing TWD. Relative air humidity had a stronger positive effect on GRO in cedar and juniper, while in pine GRO and TWD were strongly positively correlated with precipitation and high temperatures, respectively. To provide more detailed and comprehensive information on how trees are affected by climate change, long-term monitoring sites in different forest ecosystems using ecophysiological methods such as dendrometers are needed.

 Data obtained from continuous measurements of high-precision dendrometers offer information about radial stem growth and tree water relations in high resolution. In 2022, two long-term monitoring sites were established in Antalya as part of the DenTRo initiative: Point dendrometers were installed to measure stem radius changes in a mixed Cedrus libani Taurus cedar- Juniperus excelsa Greek juniper stand in the Elmalı Cedar Research Forest and in a pure Pinus brutia Turkish pine stand in the Bük Lütfü Büyükyıldırım Research Forest. This work presents the first results of stem radius change measurements covering the growing season of 2022. Seasonal dynamics of radial growth were modeled by Gompertz functions. Further, radial stem growth GRO and tree water deficit-induced stem shrinkage TWD were extracted from hourly stem radius change measurements, investigated for their patterns, and correlated with environmental variables. Radial stem growth in Turkish pine started in the first week of April, approximately three weeks earlier than cedar and juniper. Maximum GRO was also reached earlier in Turkish pine. In all three species, main stem growth happened before July after which all experienced longer periods of water limitations as measured by increasing TWD. Relative air humidity had a stronger positive effect on GRO in cedar and juniper, while in pine GRO and TWD were strongly positively correlated with precipitation and high temperatures, respectively. To provide more detailed and comprehensive information on how trees are affected by climate change, long-term monitoring sites in different forest ecosystems using ecophysiological methods such as dendrometers are needed.

 Yüksek hassasiyetli dendrometrelerin sürekli ölçümlerinden elde edilen veriler, radyal gövde büyümesi ve ağaç su ilişkileri hakkında yüksek çözünürlükte bilgi sunar. 2022 yılında, DenTRo girişiminin bir parçası olarak Antalyada iki uzun vadeli izleme sahası kurulmuştur: Elmalı Sedir Araştırma Ormanındaki bir Cedrus libani A. Rich Toros sediri- Juniperus excelsa Boylu ardıç karışık meşceresi ve Bük Lütfü Büyükyıldırım Araştırma Ormanındaki saf bir Pinus brutia kızılçam meşceresinde saatlik gövde yarıçap değişimlerini ölçmek için nokta dendrometreler kullanılmıştır. Bu çalışma, 2022 büyüme sezonunu kapsayan gövde yarıçap değişimi ölçümlerinin ilk sonuçlarını sunmaktadır. Radyal büyümenin yıl içerisindeki seyri Gompertz büyüme fonksiyonu ile modellenmiştir. Ayrıca, radyal gövde büyümesi GRO ve gövde çapının daralmasına sebep olan ağaç su açığı TWD saatlik gövde yarıçap değişimi ölçümlerinden hesaplanmıştır. GRO ve TWDnin yıl içerisindeki seyri türler arasında karşılaştırılmıştır ve korelasyon analizi ile meteorolojik değişkenlerle ilişkilendirilmiştir. Kızılçamda radyal gövde büyümesi, sedir ve boylu ardıça göre yaklaşık üç hafta önce, Nisan ayının ilk haftasında başlamıştır. Kızılçam ayrıca maksimum GRO değerlerine de daha erken ulaşmıştır. Her üç türde de ana gövde büyümesi temmuz ayından önce gerçekleşmiş, ardından artan TWD ile ölçüldüğü üzere hepsi uzun süreli su kısıtlamaları yaşamıştır. Bağıl nem sedir ve boylu ardıçta GRO üzerinde daha güçlü bir pozitif etkiye sahipken, kızılçamda GRO ve TWD sırasıyla yağış ve yüksek sıcaklıklarla güçlü pozitif korelasyon göstermiştir. Ağaçların iklim değişikliğinden nasıl etkilendiği hakkında daha ayrıntılı ve kapsamlı bilgiler edinilmesine olanak sağlayabilmek için, farklı orman ekosistemlerinde dendrometre gibi ekofizyolojik yöntemler kullanan uzun süreli izleme sahalarının kurulmasına ihtiyaç vardır.

Article Details

Assessment of radial growth and tree water deficit in Cedrus libani, Juniperus excelsa, and Pinus brutia using high-precision dendrometers

Authors:

Aylin Güney | Fatma Gökçe Cankara | Burak Bahar

Publisher:

Isparta University of Applied Sciences

Main Topics:

Ağaç Beslenme ve Fizyolojisi

Journal:

Turkish Journal of Forestry Vol.25 Issue 2, pp.166-175

Document Type:

Article

Publication Date:

6/2024

Document Language:

Turkish

Document ID (Org No.):

2001317856

pISSN:

2149-3898

Greek juniper

Stem radius change

Cambial activity

Turkish pine

Drought stress

Taurus cedarBoylu ardıç

Gövde yarıçap değişimi

Kambiyum faaliyeti

Kızılçam

Kuraklık stresi

Toros sediri

Issues

Article Details

Authors: Aylin Güney | Fatma Gökçe Cankara | Burak Bahar

Publisher: Isparta University of Applied Sciences

Main Topics: Ağaç Beslenme ve Fizyolojisi

Journal: Turkish Journal of Forestry Vol.25 Issue 2, pp.166-175

Document Type: Article

Publication Date: 6/2024

Document Language: Turkish

Document ID (Org No.): 2001317856

pISSN: 2149-3898

Issues

Authors:

Aylin Güney | Fatma Gökçe Cankara | Burak Bahar

Publisher:

Isparta University of Applied Sciences

Main Topics:

Ağaç Beslenme ve Fizyolojisi

Journal:

Turkish Journal of Forestry Vol.25 Issue 2, pp.166-175

Document Type:

Article

Publication Date:

6/2024

Document Language:

Turkish

Document ID (Org No.):

2001317856

pISSN:

2149-3898