Global gases produced by soil microorganisms

Yıl 2008, Cilt: 45 Sayı: 1, 49 - 55, 01.03.2008

Nur Okur H. Hüsnü Kayıkçıoğlu

Öz

Anahtar Kelimeler

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Toprak Mikroorganizmaları Tarafından Üretilen Küresel Gazlar

Öz

A tmosfer ve karasal ekosistemler arasında büyük miktarda gaz alışverişi mevcuttur. Büyük bir kısmı topraklarda üretilen bu gazlar; karbon dioksit (CO2), metan (CH4), nitros oksit (NO), nitrik oksit (NO) ve karbon monoksittir (CO). CO2’in % 25’i, CH4’ın % 44’ü, N2O’in % 65’i ve NO’in % 30’u toprak kaynaklıdır. CO2, toprakta organik maddenin ayrışması sırasında mikrobiyal metabolizma ile üretilmektedir. CH4 topraklarda hem üretilmekte hem de tüketilmektedir. CH4, methanogen’ler olarak bilinen bir grup anaerobik bakteriler tarafından üretilirken, aerob bakteriler olan metanotroflar tarafından da oksitlenmektedir. N2O ve NO; mikroorganizmalar tarafından üretilen iki önemli azot gazı olup nitrifikasyon ve denitrifikasyon olayları ile ortaya çıkmaktadırlar. Atmosferik küresel gazların hareketlerini tam olarak saptayabilmek ve bu gazların farklı iklim ve arazi kullanım koşullarında nasıl bir değişim göstereceklerini belirleyebilmek için çeşitli model çalışmaları yapmak gerekmektedir

Anahtar Kelimeler

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Kaynakça

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