کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9951662 | 1420842 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Warming exerts greater impacts on subsoil than topsoil CO2 efflux in a subtropical forest
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علم هواشناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
How warming affects the magnitude of CO2 fluxes within the soil profile remains an important question, with implications for modeling the response of ecosystem carbon balance to changing climate. Information on belowground responses to warming is especially limited for the tropics and subtropics because the majority of manipulative studies have been conducted in temperate and boreal regions. We examined how artificial warming affected CO2 gas production and exchange across soil profiles in a replicated mesocosms experiment relying on heavily weathered subtropical soils and planted with Chinese fir (Cunninghamia lanceolata). Half of 2âÃâ2âm mesocosms (5 replications) was heated with cables buried at a 10âcm depth, which increased temperature in the whole soil profile by 4.5, 3.6 and 2.5â°C at 15, 30 and 60âcm soil depths, respectively. Using a combination of chamber-based and concentration gradient method (CGM) approaches, we found that warming increased soil CO2 efflux across the whole profile by 40%. Changes were unevenly distributed across soil depth: mean CO2 production rate decreased from 0.74 to 0.67âμmol CO2 mâ2 sâ1 in topsoils (0-15âcm depth) whereas it increased from 0.26 to 0.73âμmol CO2 mâ2 sâ1 in subsoils (15-60âcm depth). Warming reduced moisture more strongly in subsurface than surface soils and increased subsoil soluble N concentrations as well as fine root turnover, in line with previous temperate and boreal warming studies. This consistency indicates that overall responses of subtropical forests to warming may be similar to forests in higher latitudes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Agricultural and Forest Meteorology - Volume 263, 15 December 2018, Pages 137-146
Journal: Agricultural and Forest Meteorology - Volume 263, 15 December 2018, Pages 137-146
نویسندگان
Weisheng Lin, Yiqing Li, Zhijie Yang, Christian P. Giardina, Jinsheng Xie, Shidong Chen, Chengfang Lin, Yakov Kuzyakov, Yusheng Yang,