Introducing a new tool to calculate greenhouse gas emissions from feedlot cattle

Avustralyada 2009 yılında tarım ve hayvancılık kaynaklı sera gazı üretimi, başta metan (CH4) ve nitroz oksit (N2O) gazları olmak üzere, toplam ulusal sera gazı üretiminin %15.5ini oluşturmuştur. Bu çalışmada, açık besi sistemlerinden üretilen sera gazı emisyonlarının bütün bileşenlerini içeren yeni bir aracın (F-GAF olarak da bilinen açık besi sığırlarının sera gazı hesaplanması sistemi) kullanılması tanıtılmaktadır. Bu aracın (F-GAF) geliştirilmesinin amacı, bir yandan çiftlik etkinliğinin iyileştirmesini sağlarken, diğer yandan sera gazlarının azaltılmasını amaç edinen düşünce ve çalışmaları stimüle etmek için açık besi sığırlarından üretilen sera gazı emisyonlarının kaynakları hakkında farkındalık yaratmaktır. Bu çalışmada toplam sera gazı üretiminin büyük bir çoğunluğunun (yaklaşık %60) enterik fermentasyon kaynaklı CH4 gazı üretimine dayandığı tespit edilmiştir. Diğer yandan, gübre yönetimi kaynaklı N2O gazı üretimi toplam sera gazı üretiminin yaklaşık olarak %30unu oluşturmuştur. Bu çalışmada tanıtılan F-GAF açık besi sistemlerinden üretilen toplam sera gazı emisyonunun hesaplanmasında pratik bir araç olarak kullanılabilir. Ayrıca, sera gazı üretiminin azaltılması seçeneklerini F-GAFa uyarlayacak çalışmalara ihtiyaç bulunmaktadır.

Açık besi sığırlarının sera gazı üretiminin hesaplanmasında yeni bir araç

Agriculture in Australia contributed 15.5% of total national greenhouse gas (GHG) emissions produced in 2009, mainly as methane (CH4) and nitrous oxide (N2O). In this study, a new tool (Feedlot greenhouse gas accounting framework also known as F-GAF) incorporating all components of the GHG emissions produced from feedlot systems was demonstrated. The objective of developing the F-GAF was to create awareness of the various sources of GHG emissions from feedlots in order to stimulate thinking and action aimed at reducing these emissions while further improving farming efficiency. It was found that the main source of total GHG emissions was CH4 from enteric fermentation, contributing around 60% of the total emissions. The N2O emissions were mainly produced from manure and contributed 30% of the total emissions. The F-GAF can be used as a practical tool to calculate GHG emissions from feedlot systems. Further studies can be conducted to incorporate mitigation options into the tool.

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