Evaluation of the carbon accumulation capability and carbon storage of different types of wetlands in the Nanhui tidal f
- PDF / 878,170 Bytes
- 12 Pages / 547.087 x 737.008 pts Page_size
- 27 Downloads / 168 Views
Evaluation of the carbon accumulation capability and carbon storage of different types of wetlands in the Nanhui tidal flat of the Yangtze River estuary Haoyu Dong & Liwei Qian & Jianfang Yan & Lei Wang
Received: 20 April 2020 / Accepted: 11 August 2020 # Springer Nature Switzerland AG 2020
Keywords Carbon sequestration . Silt-promoting wetland . Natural wetland . Artificial restored wetland . Tidal nutrition input . Plant biomass . Soil respiration
Abstract Wetlands are carbon pools for terrestrial ecosystems and play an important role in the global carbon cycle. The Nanhui tidal flat is located at the Yangtze River estuary and has been disturbed by various human activities. However, the effect of human activities on the carbon accumulation capability and carbon storage of wetlands in the Nanhui tidal flat is poorly understood. In this study, the annual carbon accumulation capability and carbon storage of three types of Spartina alterniflora Loisel. wetlands in the Nanhui tidal flat, which were defined as a natural wetland, silt-promoting wetland, and artificial restored wetland, were evaluated by analyzing the plant carbon fixation capability, soil carbon emissions, and soil organic carbon (SOC) density. The results showed that the three wetlands all had a carbon sink effect and the natural wetland, artificial restored wetland, and silt-promoting wetland annually accumulated 7.94, 7.14, and 6.33 kg m−2 CO2, respectively. The existing SOC density in the subsurface soil (0–40 cm) in the natural wetland, silt-promoting wetland, and artificial restored wetland was 23.26, 17.95, and 12.21 kg m−2 CO2, respectively. The natural wetland, with no human disturbance, had a longer duration of waterlogging and greater tidal nutrition inputs than the other wetlands, resulting in a higher plant biomass and lower soil respiration (SR). It therefore had the strongest carbon accumulation capability and highest SOC storage.
The continued increase in the atmospheric concentration of carbon dioxide due to anthropogenic emissions is predicted to lead to significant changes in climate (Cox et al. 2000). Besides, current rate of global warming will also contribute to the sink-source transformation due to increased soil organic matter (SOM) oxidation (Gregory et al. 1999). Therefore, in addition to reducing emissions, increasing the carbon sequestration capacity of the ecosystems is one of the important measures to alleviate excessive atmospheric CO2 concentrations. The global soil carbon pool of 2500 Gt includes about 1550 Gt of soil organic carbon (SOC) and 950 Gt of soil inorganic carbon (SIC) (Lal 2004). The soil carbon pool is 3.3 times the size of the atmospheric carbon pool (760 Gt) and 4.5 times the size of the biotic carbon pool (560 Gt) (Lal 2004). As a result, soil plays a large role in sequestering atmospheric carbon dioxide (CO2). A “carbon sink” is defined as a system that removes carbon from the atmosphere (carbon
H. Dong : L. Qian : J. Yan : L. Wang Key Laboratory of Yangtze River Water Environment, Ministry of Educa
Data Loading...
