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首页> 外文期刊>Journal of geographical sciences >Comparative study on CO_2 emissions from different types of alpine meadows during grass exuberance period
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Comparative study on CO_2 emissions from different types of alpine meadows during grass exuberance period

机译：旺盛期不同类型高寒草甸CO_2排放量的比较研究

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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 4 September, based on close chamber-GC method, a study on CO_2 emissions from different treatments was conducted in these meadows at Haibei research station, CAS. Results indicated that mean CO_2 emission rates from various treatments were 672.09+-152.37 mgm~(-2)h~(-1) for FC (grass treatment); 425.41+-191.99 mgm~(-2)h~(-1) for FJ (grass exclusion treatment); 280.36+-174.83 mgm~(-2)h~(-1) for FL (grass and roots exclusion treatment); 838.95+-237.02 mgm~(-2)h~(-1) for GG (scrub+grass treatment); 528.48+-205.67 mgm~(-2)h~(-1) for GC (grass treatment); 268.97+-99.72 mgm~(-2)h~(-1) for GL (grass and roots exclusion treatment); and 659.20+-94.83 mgm~(-2)h~(-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 CO_2 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 GG; 49% and 51% from GC. In addition, root respiration from Kobresia humilis meadow approximated 145 mgCO_2m~(-2)h(-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 gm~(-2) and 243.89 gm~(-2), respectively. Results also showed that soil temperature was the main factor which influenced CO_2 emission from alpine meadow ecosystem, significant correlations were found between soil temperature at 5 cm depth and CO_2 emission from GG, GC, FC and FJ treatments. In addition, soil moisture may be the inhibitory factor of CO_2 emission from Kobresia tibetica meadow, and more detailed analyses should be done in further research.
机译：金露梅灌木，小嵩草草甸和西藏小嵩草草甸分布在青藏高原上。在7月3日至9月4日的草繁盛时期，基于密闭室气相色谱法，在中国科学院海北研究站对这些草地上不同处理方法产生的CO_2排放进行了研究。结果表明，不同处理方式（草处理）的平均CO_2排放率分别为672.09 + -152.37 mgm〜（-2）h〜（-1）； FJ（草排斥处理）425.41 + -191.99 mgm〜（-2）h〜（-1）；佛罗里达州280.36 + -174.83 mgm〜（-2）h〜（-1）（草根排除）; 838.95 + -237.02 mgm〜（-2）h〜（-1）用于GG（磨砂+草皮处理）; 528.48 + -205.67 mgm〜（-2）h〜（-1）用于GC（草处理）; GL（草和根排除处理）268.97 + -99.72 mgm〜（-2）h〜（-1）; LC（草处理）分别为659.20 + -94.83 mgm〜（-2）h〜（-1）（FC，FJ，FL，GG，GC，GL，LC是各种处理的中文缩写）。此外，小嵩草草甸，金露梅灌木灌木草甸和西藏小嵩草草甸的土壤-植物系统平均CO_2排放速率差异较大，其顺序为GG> FC> LC> GC。此外，在矮嵩草草甸中，异养和自养呼吸分别占土壤-植物系统总呼吸的42％和58％，而金露梅灌丛草甸的异养和自养呼吸分别占总呼吸的32％和68％。 GG的系统呼吸；来自GC的49％和51％。此外，矮嵩草草甸的根系呼吸作用约为145 mgCO_2m〜（-2）h（-1），占土壤呼吸作用的34％。在实验期间，小嵩草草甸和金露梅灌木灌木草甸的固碳净值分别为111.11 gm〜（-2）和243.89 gm〜（-2）。结果还表明，土壤温度是影响高寒草甸生态系统CO_2排放的主要因素，在5 cm深度的土壤温度与GG，GC，FC和FJ处理的CO_2排放之间存在显着相关性。另外，土壤水分可能是西藏小嵩草草甸CO_2排放的抑制因子，在进一步研究中应做更详细的分析。

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