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Kayın, Göknar ve Göknar-Kayın Meşcerelerinde Yaprak Alan İndeksi ile Toprak Özellikleri Arasındaki İlişkiler

Relationships Between Soil Properties and Leaf Area Index in Beech, Fir and Fir-Beech Stands

Journal Name:

  • İstanbul Üniversitesi Orman Fakültesi Dergisi

Publication Year:

  • 2011

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
Leaf area index (LAI) control many ecophysiological processes such as photosynthesis, interception, evapotranspiration and deposition of atmospheric chemicals. LAI is a particularly important ecosystem characteristic, because it is a direct measure of the photosynthetically-active surface area which converts light energy into plant biomass. It should not be surprising that there is a strong relationship between leaf area index and productivity in many terrestrial ecosystems. In this research, leaf area index of different stands (beech, fir and fir-beech) were investigated using the hemispherical photographs. Some soil properties (e.g. texture, pH, organic C, total N and moisture) were also determined. The mean values for LAI were 3.36, 2.94 and 3.96 m2 m-2 in the beech, fir and fir-beech stands, respectively. Statistical analyses imply that there is a significant difference (p<0.05) among the leaf area indexes of the tree stand types. LAI showed significant correlation with the soil organic C, moisture and pH. Based on our results, changes of stand type are likely to effects on leaf area index and thereby photosynthesis, interception, evaporation and transpiration process under the same ecological conditions.
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Abstract (Original Language): 
Yaprak alan indeksi (YAİ), fotosentez, intersepsiyon, evapotranspirasyon ve kirleticilerin depolanması gibi çok farklı süreçleri kontrol etmektedir. YAİ güneş ışınlarını bitkisel biyokütleye çeviren aktif yaprak yüzey alanının doğrudan bir ölçüsüdür. Bu nedenle YAİ önemli bir eko sistem karakteristiğidir ve birçok karasal ekosistemde, verimlilik ile sıkı ilişki içerisindedir. Bu araştırmada, yarıküresel fotoğraflar yardımıyla farklı meşcerelerdeki (kayın, göknar ve göknar-kayın) yaprak alan indeksi değerleri araştırılmıştır. Bunun yanı sıra, incelenen meşcere tiplerine ait bazı toprak özellikleri (tekstür, pH, organik C, toplam N, nem vb.) de belirlenmiştir. Yaprak alan indeksi değerleri; kayında 3.36 m2 m-2, göknarda 2.94 m2 m-2 ve göknar-kayında 3.96 m2 m-2 bulunmuş ve istatistiki olarak anlamlı fark göstermiştir. Korelasyon analizi sonuçlarına göre; YAİ ile organik C, örnek alma anındaki nem ve pH arasında negatif ve anlamlı bir ilişki vardır. Araştırma sonuçları, aynı yetişme ortamı şartlarında, meşcere tipinin yaprak alan indeksi üzerinde etkili olduğunu ve böylece fotosentez, intersepsiyon, evaporasyon ve transpirasyon gibi süreçleri de değiştirdiğini göstermektedir.
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