Determination of transpiration rate using stable isotope mixing model in different irrigation regimes for winter wheat

Year 2018, 1. Uluslararası Tarımsal Yapılar ve Sulama Kongresi Özel Sayısı, 62 - 72, 31.12.2018

Sema Kale Çelik , Ufuk Türker , Sevinç Madenoğlu Bülent Sönmez

Abstract

The main goal of this research was to partition evapotranspiration (ET) into evaporation (E) and transpiration (T) components for determining transpiration rate of wheat using by oxygen isotope discrimination. Field experiment was conducted between the year 2009 and 2011 under Rainfed (So) and Full irrigation (S1) conditions on 5 hectares plots in Ankara-Murted Basin. Soil-water-plant samples was taken during growing period for isotopic (18O/16O) analyses. Keeling plot methods were used to determine transpiration (FT %) and evaporation (FE %) rate from atmospheric vapor (δET), soil (δE) and plant stem (δT) isotopic δ18O content. According to research results; two years average of T/ET was found for S0 treatment 50.80, 69.09 and 79.87% and for S1 treatment 53.24, 75.82 and 95.13% at 1-15-29 May respectively. This study has indicated that stable isotopes can be used to protect limited water resources and to promote sustainable use.

Keywords

Transpiration rate, partition ET, oxygen isotope, wheat

Buğdayda Farklı Sulama Koşulları Altında Kararlı İzotop Karşılaştırma Metodu Kullanılarak Bitki Su Kullanım (Transpirasyon) Oranının Belirlenmesi

Abstract

Bu araştırmanın temel
amacı, buğdayın transpirasyon oranını belirlemek için oksijen izotop ayrım
oranını kullanarak evapotranspirasyonu (ET), topraktan buharlaşma (E) ve
transpirasyon (T) bileşeni olarak ayırmaktır. Ankara-Mürted Havzasında
2009-2011 yılları arasında, 5 hektarlık büyük parsellerde sulama yapılmayan (yağışa
dayalı; S0) ve tam sulama (S1) konularında arazi denemesi
yürütülmüştür. İzotopik (18O/16O) analizlerin yapılması
için 1-15-29 Mayıs tarihlerinde toprak-su-bitki örnekleri alınmıştır. Atmosferik
su buharı (δET), toprak (δE) ve bitki sapı (δT)
izotopik δ18O içeriğinden, transpirasyon (FT %) ve
buharlaşma (FE
%) oranını belirlemek için Keeling plot yöntemi kullanılmıştır.
Araştırma sonuçlarına göre; iki yıllık ortalama transpirasyon oranı, 1-15-29
Mayıs tarihlerinde S0 konuda %50.80, 69.09 ve 79.87,  S1 konusunda ise %53.24, 75.82 ve 95.13
olarak bulunmuştur. Bu çalışma kararlı izotopların sınırlı su kaynaklarını
korumak ve sürdürülebilir kullanımını desteklemek amacıyla kullanılabileceğini
göstermiştir.

Keywords

Transpirasyon oranı, ET ayrımı, oksijen izotopu

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