【摘要】 本研究于2014年7月至2015年7月在福建漳江口红树林国家级自然保护区潮间带滩涂采集表层底质沉积物样品,研究环境因子对红树林生境底质中的底栖微藻总初级生产力、群落呼吸速率和群落净生产力的影响和调控机制.结果表明,红树林滩涂生境底质中底栖微藻总初级生产力为(2. 4±0. 8) mmol C/(m~2·h),与温度正相关,呈夏季高、冬季低的特点,温度是影响底栖微藻总初级生产力的主要环境因子;受红树林凋落物的影响,红树林生境底质中群落呼吸速率较高,使得秋、冬、春季一些月份群落净生产力出现负值,群落净生产力全年均值为(0. 5±1. 8) mmol C/(m~2·h),基本上处于二氧化碳收支平衡的状态.本研究显示底栖微藻的初级生产力影响了红树林生境底质的二氧化碳源汇格局,在红树林湿地碳循环中扮演重要的角色.更多还原

【Abstract】 During the period from July 2014 to July 2015,we collected the surface sediment samples from the intertidal mudflat of the Fujian Zhangjiang Estuary Mangrove National Nature Reserve in the subtropical area. We are aiming to reveal the influence of environmental factors on the gross primary production of microphytobenthos,community respiration,and net community production,and its underlying mechanism. The results showed that the annually-average gross primary production of microphytobenthos was( 2. 4 ± 0. 8) mmol C/( m2·h),and the variability was positively correlated with temperature with character of higher value in summer but lower in winter. Temperature has been considered as the major environmental factor controlling the change of gross primary production in the study area. The community respiration rate in the sediment of mangrove forest tends to be high because of litter-fall. Thus,the community generally shows higher frequency of negative net production in some months of autumn,winter and spring. Howere,the annually-average net community production was( 0. 5 ± 1. 8) mmol C/( m2·h),indicating the balanced state of CO2 budget. Our study shows that the pattern of CO2 source and sink in the sediment of mangrove habitats is profoundly affected by the primary productivity of microphytobenthos,which has played important roles in the carbon cycling of mangrove ecosystem.更多还原