矮嵩草草甸植被-土壤系统CO2的释放特征
A Primary Study on CO2 Emission from Soil-Plant Systems of Kobresia Humilis Meadow
查看参考文献27篇
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文摘
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采用静态箱-气相色谱法,对高寒矮嵩草草甸植被-土壤系统CO2释放特征研究结果表明:3个处理(FC、FJ、FL)CO2释放速率具有明显的日变化规律,日最大释放速率出现在13:00左右,最小释放速率在4:00前后,且白天的释放速率均大于夜间;CO2释放速率也具有明显的季节变化特征,植物生长期释放速率明显高于枯黄期,且均表现为正排放;在整个观测期间(6月30日～1月28日)CO2平均释放速率依次为FC>FJ>FL,矮嵩草草甸植物-土壤系统CO2释放速率为438.34±264.12mg/(m2·h)(FC),土壤呼吸速率为313.20±189.74 mg/(m2·h)(FJ),土壤微生物呼吸速率为230.34±145.46mg/(m2·h)(FL),植物根系呼吸占土壤呼吸的26.5%.植物、植物根系以及土壤微生物CO2释放速率与土壤5 cm温度呈极显著正相关关系,相关系数分别为0.858、0.628和0.672(P<0.01).整个系统呼吸、土壤呼吸与土壤5 cm温度可拟和为一指数方程,方程为y=168.03e0.10x86x(R2=0.8783)和y=149.69e0.0745x(R2=0.8189). |
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其他语种文摘
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Elevated atmospheric greenhouse gases concentrations are major causes of global warming. Due to its high elevation and special geographical location, the Tibetan Plateau is very sensitive to the climate change. As one of the most important ecosystems in the Plateau, alpine meadow has been playing an im-portant role in carbon balance. There are many reports about CO2 emission from such ecosystem, howev-er, simultaneous study on ecosystem respiration and soil respiration seldom occurred. In addition, for the chamber method, accurate estimation of NEP (net ecosystem productivity) needs a separation of root res-piration and soil microbial respiration from total soil respiration. In this study, three treatments FC, FJ, FL, (FC represents plant-soil system treatment, FJ is aboveground plant exclusion treatment, and FL is whole plant removal treatment) were set to study CO2 emissions from alpine Kobresia humilis meadow at Haibei research station, CAS from 30 June of 2003 to 28 January of 2004, using static chamber-GC meth-od. Results indicate that CO2 emission rates from different treatments showed clear diurnal variation and seasonal dynamics, with maximum rate appeared around 13:00, and the minimum rate around 4:00; rate of CO2 emission in the daytime was greater than that in the night, and higher in the growing period than that in the plant-drying period. During the experiment period, CO2 emission rates varied with different treatments showing an order of FC > FJ > FL. The total respiration rate of soil-plant system (FC) was 438.34 + 264.12 mg C02m~2h"1, soil respiration rate (FJ) was 313.20 ± 189.74 mg CO2 m"2h"1, soil microbial respiration rate (FL) approximated 230.34 ± 145.46 mg CO2 m~2h-1 . By comparison, ro-ot respiration rate approximated 82.86 mg CO2 m~2h"1 , accounting for 26.5 percent of soil respiration. In addition, there was a significant correlation between soil temperature at 5 cm depth and respiration rates of the total plant, plant roots and soil microbe. The correlative coefficient is 0.858^0.628 and 0.672 (P < 0.01) respectively. The separation of root respiration from total soil respiration, as practiced in this study, will contribute significant to the chamber method NEP estimation of alpine meadow. |
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来源
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资源科学
,2005,27(2):96-102 【核心库】
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关键词
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矮嵩草草甸
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CO2释放速率
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土壤呼吸
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根系呼吸
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地址
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1.
中国科学院西北高原生物研究所, 青海, 西宁, 810001
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中国科学院大气物理研究所, 北京, 100029
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1007-7588 |
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学科
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环境保护管理 |
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基金
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中国科学院知识创新工程重大项目
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国家自然科学基金项目
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中国科学院资源环境领域野外台站研究基金
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文献收藏号
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CSCD:1913886
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