| Contribution of Root Respiration to Total Soil Respiration in a Leymus chinensis （Trin.） Tzvel, Grassland of Northeast China |
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| 作者姓名： | Wei Wang Ji-Xun Guo Jiang Feng Takehisa Oikawa |
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| 作者单位： | [1]Department of Ecology, College of Environmental Sciences, Peking University, Beijing 100871, China [2]Key Laboratory for Vegetation Ecology of the Ministry of Education, Northeast Normal University, Changchun 130024, China [3]Institutes of Biological Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan |
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| 基金项目： | National Natural Science Foundation of China（30400049）. |
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| 摘 要： | The loss of carbon through root respiration Is an Important component of grassland carbon budgets. However, few data are available concerning the contribution of root respiration to total soil respiration in grasslands in China. We Investigated seasonal variations of soil respiration rate, root blomaaa, microbial blomaaa C and organic C content of the soil In a semi-arid Leymus chinensis （Trin.） Tzvel. grassland of northeast China during the 2002 growing season （from May to September）. The linear regression relationship between soil respiration rate and root blomaaa was used to determine the contribution of root respiration to total soil respiration. Soil respiration rate ranged from 2.5 to 11.9 g C/m^2 per d with the maximum in late June and minimum In September. The microbial blomaaa C and organic C content of the soil ranged from 0.3 to 1.5 g C/m^2 and from 29 to 34 g C/kg respectively. Root blomaaa had two peaks, In early June （1.80 kg/m^2） and mid-August （1.73 kg/m^2）. Root respiration rate peaked In mid-August （6.26 g C/m^2 per d）, whereas microbial respiration rate peaked In late June （7.43 g C/m^2 per d）. We estimated that the contribution of root respiration to total soil respiration during the growing season ranged from 38% to 76%.
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| 关 键 词： | 植物根部 呼吸功能 土壤成分 草地 东北地区 中国 |
| 收稿时间： | 2005-06-23 |
| 修稿时间： | 2005-06-232006-01-05 |
Contribution of Root Respiration to Total Soil Respiration in a Leymus chinensis (Trin.) Tzvel. Grassland of Northeast China |
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| Authors: | Wei Wang Ji-Xun Guo Jiang Feng Takehisa Oikawa |
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| Institution: | Department of Ecology, College of Environmental Sciences, Peking University, Beijing 100871, China;;Key Laboratory for Vegetation Ecology of the Ministry of Education, Northeast Normal University, Changchun 130024, China;;Institutes of Biological Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan |
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| Abstract: | The loss of carbon through root respiration is an important component of grassland carbon budgets. However, few data are available concerning the contribution of root respiration to total soil respiration in grasslands in China. We investigated seasonal variations of soil respiration rate, root biomass, microbial biomass C and organic C content of the soil in a semi‐arid Leymus chinensis (Trin.) Tzvel. grassland of northeast China during the 2002 growing season (from May to September). The linear regression relationship between soil respiration rate and root biomass was used to determine the contribution of root respiration to total soil respiration. Soil respiration rate ranged from 2.5 to 11.9 g C/m2 per d with the maximum in late June and minimum in September. The microbial biomass C and organic C content of the soil ranged from 0.3 to 1.5 g C/m2 and from 29 to 34 g C/kg respectively. Root biomass had two peaks, in early June (1.80 kg/m2) and mid‐August (1.73 kg/m2). Root respiration rate peaked in mid‐August (6.26 g C/m2 per d), whereas microbial respiration rate peaked in late June (7.43 g C/m2 per d). We estimated that the contribution of root respiration to total soil respiration during the growing season ranged from 38% to 76%. (Managing editor: Ya‐Qin Han) |
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| Keywords: | meadow steppe root biomass root respiration soil organic carbon soil respiration |
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