کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4439085 1620422 2012 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ecosystem carbon exchange over a warm-temperate mixed plantation in the lithoid hilly area of the North China
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علم هواشناسی
پیش نمایش صفحه اول مقاله
Ecosystem carbon exchange over a warm-temperate mixed plantation in the lithoid hilly area of the North China
چکیده انگلیسی

In recent decades, forest area in China increased rapidly by afforestation and reforestation, especially in its temperate parts. However, lack of information on carbon exchange in temperate plantations in China reduced the accuracy of estimation on regional carbon budget. In this study, CO2 flux was measured using the eddy covariance method over a broadleaf dominant mixed plantation in the lithoid hilly area of the North China. The results showed that annual maximum photosynthetic capacity (Amax) varied from 0.81 to 1.22 mg CO2 m−2 s−1 and annual initial light use efficiency (α) from 0.014 to 0.026. Net CO2 uptake was depressed when vapor pressure deficit (VPD) was more than 2.5 kPa. Annual temperature sensitivity coefficient (Q10) for ecosystem respiration, ranged from 1.84 to 2.35, was negatively correlated with base ecosystem respiration (R0) (P < 0.05). Annual R0 decreased but Q10 increased evidently when winter drought occurred. From 2006 to 2010, annual net ecosystem carbon exchange (NEE), Gross primary productivity (GPP) and ecosystem respiration (Rec) were −355 ± 34, 1196 ± 21 and 841 ± 43 g C m−2 yr−1, respectively. The warm-temperate mixed plantation in the lithoid hilly area of the North China was a strong carbon sink of the atmosphere, which was usually weaken when spring drought happened.


► The mixed plantation in the lithoid hilly area of the North China was a strong carbon sink.
► Annual net CO2 uptake declined evidently when spring drought happened.
► Annual base ecosystem respiration decreased but Q10 increased markedly when winter drought occurred.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Atmospheric Environment - Volume 49, March 2012, Pages 257–267
نویسندگان
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