کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7451686 1484125 2015 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Test stable carbon isotopic composition of soil organic matters as a proxy indicator of past precipitation: Study of the sand fields in northern China
ترجمه فارسی عنوان
تست کربن ایزوتوپ کربن مواد خاک زیستی خاک به عنوان یک شاخص پراکسی از بارندگی های گذشته: بررسی زمینه های شن و ماسه در شمال چین
کلمات کلیدی
ماده آلی سطح زمین، ترکیب ایزوتوپ کربن پایدار، لس / منطقه گذار بیابانی، آرسنیک شرقی آسیا، بارش،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی
Understanding the stable carbon isotopic composition (δ13C) of surface soil organic matter under various climates is crucial for quantitative reconstruction of past climatic changes. Although the relationship between precipitation and plant δ13C is well understood at global and regional scale, studies relating δ13C of surface soil organic matter to precipitation in northern China remain controversial. In this study, 90 surface soil samples were collected from the desert/loess transition zone of Northern China, where vegetation is sensitive to climatic changes. The stable carbon isotopic composition of organic matter in these soil samples was analyzed in order to examine its palaeoclimatic implications. Our results show that the δ13C varied from −26.56 to −19.41‰ among the investigated sites, with an average of −23.54‰. There was a strong negative correlation between the δ13C of surface soils and the mean annual precipitation (MAP) (R2 = 0.52, p < 0.05). Variation in the δ13C of C3 plants was the main factor that determined the δ13C of soil organic matter. The C4/C3 biomass ratio may also contribute to the δ13C changes, but this effect was relatively minor in our study area. Our findings suggest that a general transform function between the proxy index δ13C value and climates may not be applicable at one specific site, and that a comprehensive investigation is needed when reconstructing the past climate change using the δ13C of buried soils.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Quaternary International - Volume 372, 22 June 2015, Pages 79-86
نویسندگان
, , , , , , ,