Strong temperature dependence and no moss photosynthesis in winter CO2 flux for a Kobresia meadow on the Qinghai-Tibetan plateau
Strong temperature dependence and no moss photosynthesis in winter CO2 flux for a Kobresia meadow on the Qinghai-Tibetan plateau
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DOI：
10.1016/j.soilbio.2005.02.018
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发表时间：
2005-10-01
影响因子：
9.7
通讯作者：
Oikawa, T
中科院分区：
文献类型：
--
作者：
Kato, T;Hirota, M;Oikawa, T
生态系统CO2外排对土壤表面温度有强烈的依赖性。在光照和黑暗条件下，COZ流出量与温度的关系相同，说明在光照条件下，在测量期间没有检测到光合作用。COZ射流的温度敏感性Q（10）在-1.0℃左右发生了明显的变化；土壤表面温度≥-1.0℃时Q（10）为2.14，低于-1.0℃时Q（10）为15.3，表明土壤表面温度是控制高寒草甸生态系统冬季COZ通量的主要因素，土壤表层冻融循环对冬季CO2通量的温度依赖性起重要作用。(c) 2005 Elsevier Ltd版权所有。
We examined the CO2 exchange of a Kobresia meadow ecosystem on the Qinghai-Tibetan plateau using a chamber system. CO2 efflux from the ecosystem was strongly dependence on soil surface temperature. The COZ efflux-temperature relationship was identical under both light and dark conditions, indicating that no photosynthesis could be detected under light conditions during the measurement period. The temperature sensitivity (Q(10)) of the COZ efflux showed a marked transition around -1.0 degrees C; Q(10) was 2.14 at soil surface temperatures above and equal to -1.0 degrees C but was 15.3 at temperatures below -1.0 degrees C. Our findings suggest that soil surface temperature was the major factor controlling winter COZ flux for the alpine meadow ecosystem and that freeze-thaw cycles at the soil surface layer play an important role in the temperature dependence of winter CO2 flux. (c) 2005 Elsevier Ltd. All rights reserved.