کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8894067 | 1629395 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Soil organic carbon and mineral interactions on climatically different hillslopes
ترجمه فارسی عنوان
تداخل کربن آلاینده خاک و متابولیسم مواد معدنی در کلبه های تپه های مختلف
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کلمات کلیدی
کربن خاک، آب و هوا، میکرو کلم توپوگرافی، فرسایش، مواد معدنی مرتبط با کربن آلاینده، بیوتروبیک،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
چکیده انگلیسی
Climate and topography have been widely recognized but studied separately as important factors controlling soil organic carbon (SOC) dynamics. Subsequently, the significance of their interplay in determining SOC storages and their pools is not well understood. Here we examined SOC storages and SOC-mineral interactions along two hillslope transects in differing climate zones (MAPâ¯=â¯549â¯mm in semi-arid eucalyptus savannah vs. 816â¯mm in temperate eucalyptus forest) in southeastern Australia. On eroding slopes, SOC inventories were twice as large at the wetter site (4.5â¯Â±â¯0.6 vs. 2.3â¯Â±â¯0.9â¯kgâ¯mâ2), whereas depositional soils had similar SOC inventories at both locations (7.5â¯Â±â¯2.0 vs.7.0â¯Â±â¯2.2â¯kgâ¯mâ2). On eroding slopes, carbon concentrations of the mineral-associated SOC fraction (<250â¯Î¼m and >2.0â¯gâ¯cmâ3) increased by ~50% with increasing rainfall, which was also positively correlated to abundances of clay minerals and pedogenic iron oxides. Within individual hillslopes, carbon concentrations of the mineral-associated SOC fraction doubled from eroding to depositional soils at the drier site, but no topographic trend was observed at the wetter site. The effects of topography on SOC inventories and mineral-associated SOC were more strongly expressed under the drier climate, where vegetation was sparser and soil erosion involved mineral grain size sorting. Our results demonstrate that SOC pools and their interactions with minerals are dependent on topographic locations, emphasizing the need to include geomorphic data when assessing climatic controls of SOC.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geoderma - Volume 322, 15 July 2018, Pages 71-80
Journal: Geoderma - Volume 322, 15 July 2018, Pages 71-80
نویسندگان
Xiang Wang, Kyungsoo Yoo, Adrian A. Wackett, Jessica Gutknecht, Ronald Amundson, Arjun Heimsath,