洪湖湿地野菰群落储碳、固碳功能研究

通过实地调研与实验室测定相结合的方法,研究洪湖湿地野菰（Zizania latifolia）的现存生物量和初级生产力,测算其碳储量、固碳能力,探讨其固碳潜力.结果得出：洪湖湿地野菰地上现存生物量平均0.75kg.m-2（0.52～0.96kg.m-2）,现存碳储量平均0.33kg.m-2（0.23～0.42kg.m-2）;地下部分的生物现存量平均为1.47kg.m-2,其碳储量平均为0.65kg.m-2,均约为地上2倍,因此野菰碳储量主要在地下部分;洪湖湿地野菰地上部分净初级生产力平均合计达0.75kg.m-2.a-1,加上地下部分,平均为1.2kg.m-2.a-1,固碳能力为0.53kg.m-2.a-1,高于全国陆地植被平均固碳能力和全球植被平均固碳能力.与中国不同生态系统的固碳能力相比,由于洪湖湿地野菰种群郁闭度较高,其平均固碳能力强于城市、河流等生态系统,明显高于其他湖泊生态系统.

Carbon storage and fixation by a typical wetland plant Zizania latifolia in Honghu Lake wetland

Wetland ecosystems have strong ability for carbon storage and fixation,and play important roles in the global carbon cycle.By the combined method of on-the-spot investigation and laboratory measurements,the biomass of Z.latifolia and net primary productivity was conducted,carbon storage and fixation by Z.latifolia in Honghu Lake wetland were estimated.Results showed that the shoot biomass of Z.latifolia was at an average of 0.75 kg·m-2（0.52—0.96 kg·m-2） and carbon storage was at an average of 0.33 kg·m-2（0.23—0.42 kg·m-2）.While the root biomass and carbon storage were respectively at an average of 1.47 kg·m-2 and 0.65 kg·m-2,with which about two times than those of shoots.The total NPP（net primary productivity） of Z.latifolia was at an average of 1.2 kg·m-2·a-1,including 0.75 kg·m-2·a-1 of its shoots.The carbon fixation was at an average of 0.53 kg·m-2·a-1,which was higher than that of terrestrial vegetations in China and also in the world.Comparing to different ecosystems in China,the average carbon fixation ability of Z.latifolia in Honghu Lake wetland was higher than that of city ecosystem and rivers,and also higher than that of other lake wetlands.