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（Ziz ania latif olia）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0．75 kg・m -2（0．52～0．96 kg・m -2），现存碳储量平均0．33 kg・m-2（0．23～0．42 kg・m-2）；地下部分的生物现存量平均为1．47 kg・m -2，其碳储量平均为0．65 kg・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0．75 kg・m -2・a-1，加上地下部分，平均为1．2 kg・m -2・a-1，固碳能力为0．53 kg・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．%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 . lati f olia and net primary productivity was conducted , carbon storage and fixation by Z .lati f olia in Honghu Lake wetland were estimated .Results showed that the shoot biomass of Z .lati f olia 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 . lati f olia 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 . lati f olia in Honghu Lake wetland was higher than that of city ecosystem and rivers ,and also higher than that of other lake wetlands .
展开▼
