Comparison of soil organic carbon content,hydraulic conductivity,and particle size fractions between a grassland and a nearby black pine plantation of 40 years in two surface depths |
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| Authors: | Ilhami Bayramin Mustafa Basaran Gunay Erpul Melda Dolarslan Mustafa R Canga |
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| Institution: | (1) Department of Soil Science, Faculty of Agriculture, Ankara University, Diskapi, 06110 Ankara, Turkey;(2) Department of Soil Science, Seyrani Faculty of Agriculture, Erciyes University, Develi, Kayseri, Turkey;(3) Cankiri Forestry Faculty, Ankara University, 18200 Cankiri, Turkey |
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| Abstract: | In highlands of semiarid Turkey, ecosystems have been significantly transformed through human actions, and today changes are
taking place very rapidly, causing harmful consequences such as soil degradation. This paper examines two neighboring land
use types in Indagi Mountain Pass, Cankiri, Turkey, to determine effects of the conversion of Blackpine (Pinus nigra Arn. subsp. pallasiana) plantation from grassland 40 years ago on soil organic carbon (SOC) and soil erodibility (USLE-K). For this purpose, a total
of 302 disturbed and undisturbed soil samples were taken at irregular intervals from two sites and from two soil depths of
0–10 cm (D1) and 10–20 cm (D2). In terms of SOC, conversion did not make any statistical difference between grassland and plantation; however, there were
statistically significant differences with soil depth within each land use, and SOC contents significantly decreased with
the soil depth (P < 0.05) and mostly accumulated in D1. SOC values were 2.4 and 1.8% for grassland and 2.8 and 1.6% for plantation, respectively, at D1 and D2. USLE-K values also statistically differed significantly with the land use, and in contrast to the statistics of SOC, there
was no change in USLE-K with the soil depth. Since USLE-K was estimated using SOC, hydraulic conductivity (HC) and soil textural
composition––sand (S), silt (Si), and clay (C) contents of soils––as well as SOC did not change with the land use, we ascribed
the changes of USLE-K with the land uses to the differences in the HC as strongly affected by the interactions between SOC
and contents of S, Si, and C. On an average, the soil of the grassland (USLE-K = 0.161 t ha h ha−1 MJ−1 mm−1) was more erodible than those of the plantation (USLE-K = 0.126 t ha h ha−1 MJ−1 mm−1). Additionally, topographic factors, such as aspect and slope, were statistically effective on spatial distribution of the
USLE-K and SOC. |
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| Keywords: | Land use changes Organic carbon Spatial variability Black pine Soil erodibility |
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