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Comparative study on CO2 emissions from different types of alpine meadows during grass exuberance period
Hu Qiwu; Cao Guangmin; Wu Qin; Li Dong; WaNg Yuesi
2004
发表期刊Journal of Geographical Sciences
卷号14期号:2页码:167-176
摘要Potentilla fruticosa scrub, Kobresia humilis meadow and Kobresia tibetica meadow are widely distributed on the Qinghai-Tibet Plateau. During the grass exuberance period from 3 July to 4September, based on close chamber-GC method, a study on CO2 emissions from different treatments was conducted in these meadows at Haibei research station, CAS. Results indicated that mean CO2emission rates from various treatments were 672.09+152.37 mgm-2h-1 for FC (grass treatment); 425.41+191.99 mgrn-2h-1 for FJ (grass exclusion treatment); 280.36+174.83 mgrn-2h-1 for FL (grass and roots exclusion treatment); 838.95+237.02 mgm-2h-1 for GG (scrub+grass treatment); 528.48+205.67 mgm-2h-1for GC (grass treatment); 268.97 ±99.72 mgm-2h-1 for GL (grass and roots exclusion treatment); and 659.20±94.83 mgm-2h-1 for LC (grass treatment), respectively (FC, FJ, FL, GG, GC, GL, LC were the Chinese abbreviation for various treatments). Furthermore, Kobresia humilis meadow, Potentilla fruticosa scrub meadow and Kobresia tibetica meadow differed greatly in average CO2 emission rate of soil-plant system, in the order of GG>FC>LC>GC. Moreover, in Kobresia humilis meadow,heterotrophic and autotrophic respiration accounted for 42% and 58% of the total respiration of soil-plant system respectively, whereas, in Potentilla fruticosa scrub meadow, heterotrophic and autotrophic respiration accounted for 32% and 68% of total system respiration from G-G; 49% and 51%from GC. In addition, root respiration from Kobresia humilis meadow approximated 145 mgCO2m-2h-1,contributed 34% to soil respiration. During the experiment period, Kobresia humilis meadow and Potentilla fruticosa scrub meadow had a net carbon fixation of 111.11 grn-2 and 243.89 grn-2,respectively. Results also showed that soil temperature was the main factor which influenced CO2 emission from alpine meadow ecosystem, significant correlations were found between soil temperature at 5 cm depth and CO2 emission from GG, GC, FC and FJ treatments. In addition, soil moisture may be the inhibitory factor of CO2 emission from Kobresia tibetica meadow, and more detailed analyses should be done in further research.
关键词C02 Alpine Meadow Grass Exuberance Period Soil Respiration Treatment
学科领域生物科学
收录类别CSCD
语种英语
CSCD记录号CSCD:1842245
引用统计
文献类型期刊论文
条目标识符http://210.75.249.4/handle/363003/555
专题中国科学院西北高原生物研究所
推荐引用方式
GB/T 7714
Hu Qiwu,Cao Guangmin,Wu Qin,et al. Comparative study on CO2 emissions from different types of alpine meadows during grass exuberance period[J]. Journal of Geographical Sciences,2004,14(2):167-176.
APA Hu Qiwu,Cao Guangmin,Wu Qin,Li Dong,&WaNg Yuesi.(2004).Comparative study on CO2 emissions from different types of alpine meadows during grass exuberance period.Journal of Geographical Sciences,14(2),167-176.
MLA Hu Qiwu,et al."Comparative study on CO2 emissions from different types of alpine meadows during grass exuberance period".Journal of Geographical Sciences 14.2(2004):167-176.
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