Shao Xue-xin, Li Wen-hua, Wu Ming, Yang Wen-ying, Jiang Ke-yi, Ye Xiao-qi
Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Wetland Ecosystem Research Station of Hangzhou Bay, State Forestry Administration, Fuyang 311400, China.
Huan Jing Ke Xue. 2013 Sep;34(9):3451-7.
Salt marshes perform important ecosystem functions in carbon, nitrogen and phosphorus recycling. The plant biomass, content and pools of C, N and P were measured seasonally in three marsh species Phragmites australis, Spartina alterniflora and Scirpus mariquezer in Hangzhou Bay coastal wetland for the dynamics of C, N and P storage. The results showed that seasonal variation of aboveground biomass displayed a unimodal curve. The seasonal variability of plant OC content in the aboveground part of the plants was not significant, while the TN and TP content decreased significantly from spring to winter. The seasonal variability of plant C, N and P pools was significant. And there was a significant relationship between plant C/N/P pools and biomass. The pools among plant species were significantly different. S. mariqueter had the lowest C/N/P pools. TN pool in the aboveground part of P. australis was higher than that of S. aterniflora, but its TP pool was lower than that of S. alterniflora, and there was no significant difference for OC pools between P. australis and S. alterniflora. C fixation of the three marsh species was 380%, 376% and 55.5% of the average C fixation of terrestrial vegetations in China, and 463%, 458% and 67.7% of the average C fixation of terrestrial vegetations of the world. Considering the purification capacity of N and P, July would be the best harvest time of the study area for three plants. And the harvest of S. alterniflora could remove the biggest amount of P, since P was a limiting nutrient for phytoplankton growth. In conclusion, the marsh plants had strong C fixation and N/P purification ability.
盐沼在碳、氮和磷的循环中发挥着重要的生态系统功能。为了研究杭州湾滨海湿地中芦苇、互花米草和海三棱藨草这三种盐沼植物碳、氮、磷储量的动态变化，对其植物生物量以及碳、氮、磷的含量和储量进行了季节性测定。结果表明，地上生物量的季节变化呈现单峰曲线。植物地上部分有机碳含量的季节变化不显著，而总氮和总磷含量从春季到冬季显著下降。植物碳、氮、磷储量的季节变化显著。植物碳/氮/磷储量与生物量之间存在显著关系。不同植物物种之间的储量差异显著。海三棱藨草的碳/氮/磷储量最低。芦苇地上部分的总氮储量高于互花米草，但其总磷储量低于互花米草，芦苇和互花米草的有机碳储量无显著差异。三种盐沼植物的固碳量分别是中国陆地植被平均固碳量的380%、376%和55.5%，以及世界陆地植被平均固碳量的463%、458%和67.7%。考虑到氮和磷的净化能力，7月是研究区域内这三种植物的最佳收获时间。互花米草的收获能够去除最多的磷，因为磷是浮游植物生长的限制营养元素。总之，盐沼植物具有较强的固碳能力和氮/磷净化能力。
