中国科学院海岸带环境过程与生态修复重点实验室知识库

国科学院烟台海岸带研究所海岸带环境过程与生态修复重点实验室; 山东省海岸带环境过程重点实验室;中国科学院大学;山东省黄河三角洲生态环境重点实验室

采用时空替代法,选择黄河口未恢复区(R0)、恢复5年区(R2007)和恢复10年区(R2002)的芦苇湿地为研究对象,研究了建群种芦苇的株高、密度、立枯物量、地上生物量的动态变化趋势。结果表明,不同恢复阶段的芦苇株高整体均呈增加趋势,且R2002与其它两个恢复阶段差异显著(PR2007≈R0,其季节动态符合抛物线模型(y=b0+b1t+b2t2,R2≥0.90,P<0.01)。不同恢复阶段芦苇地上器官对地上生物量的平均贡献率均无显著差异,但均以茎的...

The Yellow River Delta wetland is the largest wetland ecosystem in the warm temperate zone of China and the most active region of land-ocean interaction among the large river deltas in the world, which is of typical continental monsoon climate with distinctive seasons. In recent years, low flow of the Yellow River has led to a decrease in water supply to the wetlands. As a result, Phragmites australis wetland ecosystem in the Yellow River Delta has deteriorated significantly. To prevent further degradation of the wetland and improve the wetland functions, an ecological restoration project was implemented in the region governed by Dawenliu Management Station in the Yellow River Delta Nature Reserve in July 2002 by supplementing abundant freshwater to the degraded wetlands. So far, enormous changes have occurred in the wetland ecosystem in the past 12 years following restoration project. A monitoring study was implemented along with the restoration project. By using the method of time-space mutual substitution, ecological traits of P. australis, such as height, density, litter production, and aboveground biomass were studied in non-restoration wetland (R0), restoration wetland for five years (R2007), and restoration wetland for ten years (R2002) of the Yellow River estuary. Results showed that the height of P. australis in the growing season generally increased in different restoration phases; the increase in R2002differed from that in R2007and R0(P2002and R2007. The aboveground biomass and its components in different restoration phases were in the order of R2002> R2007≈ R0, which could be described by the parabola model (y = b0+ b1t + b2t2, R2≥S 0.90, P 2002> R2007> R0. The variations of litter production could be explained by an exponential model (y = A0ebT+ B0, R2> 0.95, P 2002> R2007> R0. This study also found that wetland hydrological regime (water depth and water quality) were the most important factors influencing the different ecological traits and the aboveground biomass of P. australis in different restoration phases. Therefore, it was suggested that, in the next step, the wetland restoration project should adopt the approach of less but more frequent replenishment. Furthermore, the restoration project should avoid the period of poor water quality. The results of this paper provide basic information for evaluating the effects of the ecological restoration project and improving the management of wetland restoration in the future. However, long-term monitoring is still needed to determine the inter-annual variations of ecological traits of P. australis within the restoration wetlands, which is essential to evaluate the effects of wetland restoration projects. © 2015 Ecological Society of China. All Rights Reserved.