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Materials and methods Study site and preparation of soil samplesThis study was conducted in Osmaniye, which is characterized by a semiarid Mediterranean climate, having a mean annual precipitation of 808 mm and mean annual temperature of 18.2 °C for the last 27 years. Two different plots were selected, 1 without any previous application of imazamox or other pesticides (NI) at Osmaniye Korkut Ata University, and 1 with 6 years of imazamox application (I).

Drought by climate change in East Mediterranean Region will change soil temperature and moisture that lead to alter the cycling of biological elements like carbon and nitrogen. However, there are few studies that show how sensitivity of soil organic matter mineralization to temperature and/or moisture can be modified by changes in these parameters. In order to study how these changes in temperature and moisture affect soil carbon and nitrogen mineralization, a laboratory experiment was carried out in two depths (0-5 and 5-15 cm) of soils of Onobrychis beata and Trifolium speciosum being common annual plants in Turkey that was taken from Kızıldag Plataeu (Adana city). Some soil physical and chemical properties and as well as rate of carbon and nitrogen mineralizations were determined for both depths of soils. These soils were incubated for 42 days under different field capacities (FC 60, 80 and 100%) and temperatures (24, 28 and 32°C). Cumulative carbon mineralization (C m), potential mineralizable carbon (C 0) and rate of carbon mineralization of all soils were increased with rising temperatures. Rate of carbon mineralization in O. beata soil were lower than T. speciosum soil. NH 4-N and NO 3-N contents at 42nd day were higher than initial levels of soils and also increased with temperatures and field capacities. In summary, sensitivity of soil organic matter mineralization to temperature was higher at 32°C in upper layer and lower at 24°C in deeper layer of both soils.

ÖzKromun (Cr) endüstrideki yaygın kullanımına bağlı olarak çeşitli çevresel ortamlarda ciddi bir kirletici haline geldiği ve toprak mikroorganizmalarına karşı son derece toksik etki gösterdiği bilinmektedir. Buna göre kroma uzun süre maruz kalmış ekosistemlerde toprak mikroorganizmalarının fonksiyonlarının bilinmesi çok önemli bir yer tutmaktadır. Bu bağlamda Aladağ' da (Adana) krom maden ocağına yakın ve ocaktan etkilenmemiş 3 farklı alandan (Bozluk, Kızılyüksek ve Yanıkçam) alınan cevherli ve cevhersiz toprakların azot mineralizasyonlarını kıyaslamak ve kromun mikroorganizmalara olası etkilerini ortaya koymak amaçlanmıştır. Toprakların azot mineralizasyonu (NH 4 Nitrogen Mineralization in Soils of Chromium Mine Area in the East Mediterranean Region AbstractIt is known that chromium became a serious pollutant in various environmental due to its common use in industry and that it is highly toxic effect for soil microorganisms. For this reason, it is important to know the functioning of soil microorganism in ecosystesms which are exposed to chromium for a long time. In this context, it was aimed to compare nitrogen mineralization of contamined and uncontamined soils which were in 3 different regions (Bozluk, Kızılyüksek and Yanıkçam) in Aladağ (Adana) near mine but not effected of it and to reveal possible effects of chromium on microorganism. Nitrogen mineralization of soils (NH 4 +-N,NO 3 --N) was determined by the Parnas-Wagner method over 42 days (11 th , 26 th , and 42 nd days) at 28 o C and under constant moisture. The total Cr content of contamined soils is higher than uncontamined soils except for Yanıkçam region (309,59 mg kg -1 ). In each place, mineralization rates of chromium added contamined or uncontamined soils were measured higher than the soils which were contamined. The maximum mineralization rate was observed in uncontamined soils of Kızılyüksek (1.73%) which were not added Cr, the minimum rate was in the soils of contamined soils of Yanıkçam which were also not added (0.36%). Based on the results obtained from the findings of this study, it is possible that ammonium and nitrate bacteria was affected by chromium.