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标题：EFFECTS OF LONG-TERM FENCING ON ECOSYSTEM CARBON EXCHANGE IN A MEADOW STEPPE IN CENTRAL ASIA
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作者：Dongliang Han ; Xinping Zhu ; Pujia Yu 等
期刊名称：Fresenius Environmental Bulletin
印刷版ISSN：1018-4619
出版年度：2017
卷号：26
期号：11
页码：6421-6431
语种：English
出版社：PSP Publishing
摘要：A better understanding of the responses of various ecosystem CO2 fluxes to human activity is vital for restore degraded grasslands and mitigating global warming. However, still undefined how CO2 exchanges (e.g. net ecosystem carbon exchange, NEE; gross ecosystem productivity, GEP and ecosystem respiration, ER) will respond to the fenced and grazed at a meadow steppe northwest of China. Base on an infrared gas analyzer linked to a clear plexiglass incubation chamber, we conducted an experimental study to examine effects of fenced meadow (from 2005 to now) on NEE, GEP and ER over the growing seasons from 2012 to 2015. Results showed that net carbon up take was found in all treatments in four years, with the NEE ranging from -3.96 to -0.01 ^ mol/(m2s), the cumulative values were -105.73 ± 20.80 and -99.28 ±18.43 g C/(m2-yr) for fenced and grazed meadows, respectively. Compare with grazed meadow, fenced meadow significantly increased (P<0.05) NEE (5%, 10%, 7% and 9% from 2012 to 2015, respectively) could primarily be attributed to greater stimulation of GEP than ER. These results suggested that fenced meadow prevails over grazed meadow in maintaining carbon balance in arid and semi-arid grasslands.
关键词：Fenced meadow;net ecosystem C exchange;gross ecosystem productivity;ecosystem respiration;Central Asia