کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9619406 | 158429 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Statistical analyses of inter-annual variations in the vertical profile of atmospheric CO2 mixing ratio and carbon budget in a cool-temperate deciduous forest in Japan
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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
Using the 1994-2002 continuous data of CO2 mixing ratio, CO2 flux and meteorological parameters observed at the Takayama site located in a cool-temperate deciduous forest in central Japan, various statistical analyses are performed to examine inter-annual variations of annual mean height-dependent vertical CO2 mixing ratio differences; these are then compared to annually integrated carbon budget components estimated from the flux measurement. The mixing ratio measurements are made at 27 and 18Â m (located above the canopy), and 8.8 and 5.8Â m (located inside the canopy) on a tower situated at the site. Relative to 27Â m, the annual mean mixing ratios in the lower layers show a significant positive correlation (>90 or >95% confidence level) with the annually integrated soil respiration, while a significant negative correlation (>95% confidence level) between the 18- and 27-m mixing ratio difference for the daytime data and the annually integrated gross primary production is obtained. Significant long-term trends (>95% confidence level) of the annual mean vertical mixing ratio differences are found, with an increasing trend for the daytime and nighttime data at the lower levels inside the canopy and a decreasing trend for the daytime data near the canopy height. Seasonal analysis shows that the increase in trend occurs mostly in mid-summer of the growing season, while the decrease in trend occurs in late spring. It is therefore suggested that the inter-annual variation and the long-term trend of the vertical CO2 mixing ratio difference obtained from high-precision mixing ratio measurements on a tower in a forest could provide us with useful information on the carbon budget components.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Agricultural and Forest Meteorology - Volume 134, Issues 1â4, 30 November 2005, Pages 17-26
Journal: Agricultural and Forest Meteorology - Volume 134, Issues 1â4, 30 November 2005, Pages 17-26
نویسندگان
Shohei Murayama, Susumu Yamamoto, Nobuko Saigusa, Hiroaki Kondo, Chikako Takamura,