Hu Qi-Wu, Xing Rui-Xin, Zhu Li-Li, Wu Qin, Yao Bo, Liu Ying, Hu Bin-Hua
School of Geography and Environment, Jiangxi Normal University, Nanchang 330022, China.
Ying Yong Sheng Tai Xue Bao. 2011 Jun;22(6):1431-6.
By using static chamber/gas chromatography, the CO2 fluxes in a Carex cinerascen-dominated wetland in the Poyang Lake Nanji Wetland National Nature Reserve were measured in nonflooded period (from September 2009 to April 2010). Two treatments were installed, i. e. , soil-plant system (TC) and aboveground plant removal (TJ), representing ecosystem respiration and soil respiration, respectively. There was an obvious seasonal variation in the ecosystem respiration and soil respiration. The respiration rate in treatment TC ranged from 89.57 to 1243.99 mg CO2 x m(-2) x h(-1), and that in TJ was from 75.30 to 960.94 mg CO2 x m(-2) x h(-1). Soil respiration accounted for 39% -84% of ecosystem respiration, with an average of 64%. Soil temperature was the main factor controlling the ecosystem respiration and soil respiration, explaining more than 80% of the respiration variance. The temperature coefficient (Q10), an index of temperature sensitivity for respiration, was 3.31 for ecosystem respiration and 2.75 for soil respiration. The Q10 value was higher in winter than in autumn and spring. No significant correlation was observed between soil moisture and CO2 fluxes. In non-flooded period, the C. cinerascens-dominated wetland acted as a carbon sink of atmospheric CO2, with a carbon uptake of 1717.72 g C x m(-2).
利用静态箱/气相色谱法，对鄱阳湖南矶湿地国家级自然保护区中以灰化苔草为主的湿地在非淹水期（2009年9月至2010年4月）的二氧化碳通量进行了测量。设置了两种处理方式，即土壤-植物系统（TC）和地上植物去除处理（TJ），分别代表生态系统呼吸和土壤呼吸。生态系统呼吸和土壤呼吸存在明显的季节变化。处理TC中的呼吸速率范围为89.57至1243.99毫克二氧化碳·平方米⁻²·小时⁻¹，TJ中的呼吸速率范围为75.30至960.94毫克二氧化碳·平方米⁻²·小时⁻¹。土壤呼吸占生态系统呼吸的39% - 84%，平均为64%。土壤温度是控制生态系统呼吸和土壤呼吸的主要因素，解释了超过80%的呼吸变化。温度系数（Q10）是呼吸温度敏感性的指标，生态系统呼吸的Q10为3.31，土壤呼吸的Q10为2.75。冬季的Q10值高于秋季和春季。未观察到土壤湿度与二氧化碳通量之间存在显著相关性。在非淹水期，以灰化苔草为主的湿地是大气二氧化碳的碳汇，碳吸收量为1717.72克碳·平方米⁻²。
