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

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

Öz

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.

Anahtar Kelimeler

• Transpirasyon oranı,ET ayrımı,oksijen izotopu

Kaynakça

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