کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
4570855 1332079 2017 10 صفحه PDF ندارد دانلود رایگان
عنوان انگلیسی مقاله
Influence of topography on soil organic carbon dynamics in a Southern California grassland
ترجمه فارسی عنوان
اثر توپوگرافی بر روی پویایی‌های کربن آلی خاک در مرتع جنوب کالیفرنیا
کلمات کلیدی
فرسایش؛ خاک کربن آلی (SOC)؛ 137Cs؛ FTIR؛ نقشه برداری
Erosion; Soil organic carbon (SOC); 137Cs; FTIR; Topography
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی


• Terrain attributes determine SOC distribution along the landscape.
• Moderate slope and concave curvature favor SOC accumulation.
• Lower SOC content, greater accumulation of aromatics at eroding sites

Soil erosion and deposition processes play an important role influencing accumulation and long-term stability of soil organic carbon (SOC). Therefore, evaluations of landscape-scale magnitude and variability of SOC across topographically active landscapes will improve understanding about important drivers of SOC dynamics. In this study, we investigated the relationship between terrain attributes and quantity and spectroscopic characteristics of SOC for a hillslope system in Southern California. Thirteen soil cores were sampled at representative landscape positions with a history of intense erosion. We observed a strong relationship between slope, plan and profile curvature, and quantity and quality of SOC accumulation along the hillslope systems. Specifically, moderate slopes (< 15%) combined with concave profile and plan curvature led to greater SOC accumulation. Spectroscopic analysis of water extractable organic carbon (WEOC) and bulk SOC shows greater presence of aromatics at eroding sites than at depositional sites, likely due to the contribution of eroded upslope materials. These differences in SOC and WEOC are the result of landscape-scale processes of SOC respiration by soil microflora. They likely reflect the potential for SOC stabilization via interaction with soil mineral surfaces. Our findings emphasize the role of specific terrain attributes rather than hillslope position alone in influencing the dynamics of SOC and its quality, information that can be also relevant in informing management and restoration practices.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: CATENA - Volume 149, Part 1, February 2017, Pages 140–149
نویسندگان
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