盘锦湿地芦苇群落土壤呼吸作用动态及其影响因子分析

采用LI-6400-09土壤呼吸室对盘锦湿地芦苇群落土壤呼吸作用,于2004年7月—2005年12月进行连续野外观测。结果表明:非淹水状态下,湿地芦苇群落土壤呼吸作用具有明显的日变化和季节变化特征;淹水状态下,湿地芦苇群落土壤呼吸作用接近于0。2005年潮汐造成的洪水减少了2/3的土壤呼吸作用。2004年和2005年芦苇群落土壤呼吸作用最大值都出现于洪水退去后。影响湿地芦苇群落土壤呼吸作用空间异质性的主导因子是生物因子,而在同一时间影响湿地芦苇群落土壤呼吸作用的主导因子是温度和水分。

Soil respiration and its controlling factors at Phragmites communis wetland in Panjin

Soil respiration dynamics of Phragmites communis wetland in Panjin,Liaoning province was measured from the year of 2004 to 2005 with a LI-6400-09 system.The daily and seasonal patterns of soil respiration rate were obvious,and it approached to zero under inundation.The inundation leaded by tides decreased two thirds of soil respiration in 2005.The maximum value of soil respiration was found after inundation both in 2004 and in 2005.The controlling factors of soil respiration in spatial scale were underground biomass,but those in temporal scale were soil water content and soil temperature.