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The contribution of root respiration to soil CO_2 efflux in Puccinellia tenuiflora dominated community in a semi-arid meadow steppe

机译:半干旱草原草原根草群落中根系呼吸作用对土壤CO_2流出的贡献

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In this study, the linear regression between soil respiration rate and root biomass was adopted to estimate the contribution of root respiration to total soil respiration in Puccinellia tenuiflora dominated community of a semi-arid meadow steppe in northeast China. The soil respiration rate reached the maximum value 2.45 mu mol centre dot m_(-2) centre dot s~(-1) in late June and the minimum value 0.39 mu mol centre dot m_(-2) centre dot s~(-1) in late September. Soil temperature is the major environmental factor controlling the seasonal variation of soil respiration. The root biomass ranged from 0.54 to 0.97 kg centre dot m~(-2), showing insignificant seasonal variation. Microbial biomass C reached the maximum value 0.50 g centre dot m~(-2) in mid August, presenting the least within-site variation. The pattern of seasonal change in root respiration rate was different from that in microbial respiration. Root respiration rate ranged from 0.19 mu mol centre dot m_(-2) centre dot s~(-1) in May, to the maximum value 1.39 mu mol centre dot m_(-2) centre dot s~(-1) in late June, then down to 0.28 mu mol centre dot m_(-2) centre dot s~(-1) in late September; whereas, microbial respiration rate ranged from 0.61 mu mol centre dot m_(-2) centre dot s~(-1) in May, to the maximum value 1.27 mu mol centre dot m_(-2) centre dot s~(-1) in July, then down to 0.11 mu mol centre dot m_(-2) centre dot s~(-1) in late September. There was a significant exponential correlation between microbial respiration rate and soil temperature, whereas not so for root respiration rate. We estimated that the contribution of root respiration to total soil respiration ranged within 24 percent - 57 percent in spring and summer, and increased to 73 percent in autumn.
机译:本研究采用土壤呼吸速率与根系生物量之间的线性回归方法,估算了东北半干旱草甸草原半夏(Puccinellia tenuiflora)主导的群落中根系呼吸作用对总土壤呼吸作用的贡献。 6月下旬土壤呼吸速率达到最大值2.45μmol中心点m _(-2)中心点s〜(-1),最小值0.39μmol中心点m _(-2)中心点s〜(-1) )。土壤温度是控制土壤呼吸季节变化的主要环境因素。根系生物量在0.54〜0.97 kg中心点m〜(-2)之间,季节变化不明显。 8月中旬,微生物量C达到最大值0.50 g中心点m〜(-2),站内变化最小。根呼吸速率的季节性变化模式与微生物呼吸的季节性变化模式不同。根呼吸速率从5月的0.19μmol中心点m _(-2)中心点s〜(-1)到后期的最大值1.39μmol中心点m _(-2)中心点s〜(-1) 6月,然后在9月下旬降至0.28μmol中心点m _(-2)中心点s〜(-1);而微生物的呼吸速率则从5月份的0.61μmol中心点m _(-2)中心点s〜(-1)到最大值1.27μmol中心点m _(-2)中心点s〜(-1)。在7月,然后在9月下旬降至0.11μmol中心点m _(-2)中心点s〜(-1)。微生物呼吸速率和土壤温度之间存在显着的指数相关性,而根系呼吸速率则没有显着的指数相关性。我们估计,根呼吸对土壤总呼吸的贡献在24%-春季和夏季为57%,秋季增加到73%。

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