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  • Küçük Resim
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    THE EFFECTS OF ARTIFICIAL DRAINAGE ON SOIL CHARACTERISTICS OF A PEATLAND ECOSYSTEM IN SOUTHEAST TURKEY
    (Parlar Scientific Publications (P S P), 2010) Gundogan, Recep; Hall, Nigel; Demirkiran, Ali Riza; Aydemir, Salih; Korkmaz, Huseyin
    Artificial drainage for agriculture causes the alteration of peatlands through excessive oxidation and fires. Peats lose their functions and also contribute to the release of carbon dioxide to the atmosphere. In this study, morphological, micro morphological and chemical soil characteristics of an artificially drained peat land located in the southern Turkey were investigated to assess the effects of excessive oxidation and fire. Soil samples described as sapric, hemic, or burnt were collected along four transects on the peatland. The results clearly indicated that burning process resulted in significant decrease in total carbon and nitrogen content of soils since 1950 whereas pH, ash content, available P and K contents were increased. Interpretations recognized as a degradation sequence after drainage. The results demonstrated that artificial drainage of peatlands for agricultural purposes leads to a change in organic soil properties. The carbon and nitrogen sink were depleted, C by about 2 x 10(6) and N by about 0.1 x 10(6) tons, and pH was raised above the level that is ideal for cropping, in a system that is not only completed changed but unsustainable without increasing soil inputs in the long term.
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    Öğe
    The effects of artificial drainage on soil characteristics of a peatland ecosystem in southeast Turkey
    (2010) Gundogan, Recep; Hall, Nigel; Demirkiran, Ali Riza; Aydemir, Salih; Korkmaz, Hüseyin
    Artificial drainage for agriculture causes the alteration of peatlands through excessive oxidation and fires. Peats lose their functions and also contribute to the release of carbon dioxide to the atmosphere. In this study, morphological, micro morphological and chemical soil characteristics of an artificially drained peat land located in the southern Turkey were investigated to assess the effects of excessive oxidation and fire. Soil samples described as sapric, hemic, or burnt were collected along four transects on the peatland. The results clearly indicated that burning process resulted in significant decrease in total carbon and nitrogen content of soils since 1950 whereas pH, ash content, available P and K contents were increased. Interpretations recognized as a degradation sequence after drainage. The results demonstrated that artificial drainage of peatlands for agricultural purposes leads to a change in organic soil properties. The carbon and nitrogen sink were depleted, C by about 2 ×106 and N by about 0.1 ×106 tons, and pH was raised above the level that is ideal for cropping, in a system that is not only completed changed but unsustainable without increasing soil inputs in the long term. © by PSP.
  • Küçük Resim
    Öğe
    Phosphorous sorption in some great soil groups of semi-arid region of Turkey
    (2008) Bilgili, Ali Volkan; Uygur, Veli; Karaca, Siyami; Usta, Sadik; Dengiz, Orhan; Aydemir, Salih
    Removal of fertilizer phosphorous by adsorption and precipitation processes is an important factor for yield loss in low input soils of arid and semi-arid regions. The phosphate sorption characteristics of surface and subsurface horizons of four semi-arid region soils and their relationships with soil chemical and physical properties were investigated. Two sorption sites were identified. The adsorption capacity was greater for region 1 while bonding energy was higher for region 2 sites. The adsorption maxima (b1) of the low concentration range (region-I) was 625-1250 ?g P/g and adsorption energy coefficient k1 ranged between 0.159-0.800 mL ?g -1. The calculated b and k values of high concentration range (region-II) were not treated as real adsorption parameters, because as the concentration increased, the data weakly confirmed Langmuir isotherm. This revealed the fact that Langmuir isotherm can be applied to phosphorous adsorption in soils and soil materials to a limited extent. Adsorption maximum of soils for P were found to be greater for soils and horizons high in CaCO 3, clay and CEC. Statistically significant positive relationships were found between adsorption maximum and CaCO3, clay and CEC whereas important negative relationships were found between adsorption capacity and organic matter, sand, Fe2O3 and Al2O 3 content of soils. © 2008 Academic Journals Inc.