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应用生态学报 ›› 2011, Vol. 22 ›› Issue (06): 1431-1436.

• 研究报告 • 上一篇    下一篇

鄱阳湖苔草湿地非淹水期CO2释放特征

胡启武1,2**,幸瑞新1,朱丽丽1,吴琴1,尧波1,刘影1,胡斌华3   

  1. 1江西师范大学地理与环境学院, 南昌 330022;2鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022; 3鄱阳湖南矶湿地国家级自然保护区, 南昌 330127
  • 出版日期:2011-06-18 发布日期:2011-06-18

Characteristics of CO2 emission from Carex-dominated wetland in Poyang Lake  in non-flooded period.

HU Qi-wu1,2, XING Rui-xin1, ZHU Li-li1, WU Qin1, YAO Bo1, LIU Ying1, HU Bin-hua3   

  1. 1School of Geography and Environment, Jiangxi Normal University, Nanchang 330022, China;2Ministry of Education Key Laboratory of Poyang Lake Wetland and Watershed Research, Jiangxi Normal University, Nanchang 330022, China; 3Poyang Lake Nanji Wetland National Nature Reserve, Nanchang 330127, China
  • Online:2011-06-18 Published:2011-06-18

摘要: 2009年9月至2010年4月非淹水期,在鄱阳湖南矶湿地国家级自然保护区,选择以灰化苔草为建群种的洲滩湿地,设置土壤-植物系统(TC)、剪除植物地上部分(TJ)2个试验处理(分别代表生态系统和土壤呼吸),利用密闭箱-气相色谱法测定了非淹水期鄱阳湖苔草湿地CO2释放通量.结果表明:苔草湿地生态系统呼吸与土壤呼吸均具有明显的季节变化模式,释放速率变化范围分别为89.57~1243.99和75.30~960.94 mg CO2·m-2·h-1,土壤呼吸占生态系统呼吸的比例为64%(39%~84%);土壤温度是苔草湿地CO2通量的主要控制因子,可以解释呼吸速率80%以上的变异;生态系统呼吸与土壤呼吸的温度敏感性指数(Q10)分别为3.31和2.75,且冬季的Q10值明显高于春秋季节;土壤水分与CO2释放速率之间未达到显著相关;非淹水期,鄱阳湖苔草湿地是大气CO2的汇,其强度为1717.72 g C·m-2.

关键词: 鄱阳湖, 湿地, 生态系统呼吸, 土壤呼吸, Q10

Abstract: 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 non-flooded 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·m-2·h-1, and that in TJ was from 75.30 to 960.94 mg CO2·m-2·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·m-2.

Key words: Poyang Lake, wetland, ecosystem respiration, soil respiration, Q10