Effect of some soil physical parameters on soil respiration and microbial biomass carbon

Öz

In this study, the relationships between some physical (moisture, temperature and penetration resistance) and biological (respiration-CO2 and microbial biomass carbon-MBC) properties were investigated for 0-15 and 15-30 cm soil depth in different land uses with dry and irrigated agriculture. The moisture, temperature and penetration resistance contents of the soils varied between 2-79-16.66%, 14.00-26.00% and 0.40-4.46 MPa in the study,. The average CO2 and microbial biomass carbon levels of the soils were found to be 0.91 mg CO2/g dry soil and 54 mgMBC/g dry soil. Increases in microbial biomass carbon (r: 0.264; r: 0.282) were detected with increases in soil temperature and moisture content. Soil temperature and microbial biomass carbon were found to be the parameters that showed significant variation depending on soil depth. The properties that showed significant variation depending on different land uses were determined as soil respiration and microbial biomass carbon (p<0.05). No results were found to show that soil penetration resistance has an effect on its biological properties. The study revealed that soil moisture and temperature have an effect on biological parameters and that they also vary depending on land uses.

Anahtar Kelimeler

• Biological activity
• soil properties
• soil compaction
• land use

Bazı toprak fiziksel parametrelerinin toprak solunumu ve mikrobiyal biyokütle karbonuna etkisi

Öz

Bu çalışmada; kuru ve sulu tarım yapılan farklı arazi kullanımlarında 0-15 ve 15-30 cm toprak derinliği için bazı fiziksel (Nem, sıcaklık ve penetrasyon direnci) ve biyolojik (Solunum- CO2 ve mikrobiyal biyokütle karbonu-MBC) özellikler arasındaki ilişkiler incelenmiştir. Çalışmada toprakların nem, sıcaklık ve penetrasyon direnci içerikleri %2-79-16.66, %14.00-26.00 ve 0.40-4.46 MPa arasında değişkenlik sergilemiştir. Toprakların ortalama CO2 ve mikrobiyal biyokütle karbonu seviyeleri ise 0.91 mg CO2/g kuru toprak ve 54 mg MBC/g kuru toprak olarak bulunmuştur. Toprak sıcaklığı ve nem içeriğindeki artışlarla mikrobiyal biyokütle karbonunda da artışlar (r:0.264; r:0.282) tespit edilmiştir. Toprak derinliğine bağlı önemli seviyede değişkenlik gösteren parametreler toprak sıcaklığı ve mikrobiyal biyokütle karbon olarak bulunmuştur. Farklı arazi kullanımlarına bağlı önemli seviyede değişkenlik gösteren özellikler toprak solunumu ve mikrobiyal biyokütle karbon olarak belirlenmiştir (p<0.05). Toprak penetrasyon direncinin biyolojik özellikleri üzerinde etkili olduğunu gösteren sonuçlara ulaşılamamıştır. Çalışma sonucunda toprak nemi ve sıcaklığının biyolojik parametreler üzerinde etkili olduğu arazi kullanımlarına bağlı olarak da değişkenlikler sergilediği ortaya konmuştur.

Anahtar Kelimeler

• Biyolojik aktivite
• toprak özellikleri
• toprak sıkışması
• arazi kullanımı

Kaynakça

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