模拟升温对滨海湿地盐地碱蓬生物量及其枯落物分解影响的研究

Studying and simulating the effects of global warming on Suaeda salsa population growth and its litter decomposition in the coastal wetland of the Laizhou Bay

为了研究滩涂湿地植物枯落物分解状况与温度的响应关系,基于系统动力学的原理,采用STELLA软件构建了盐地碱蓬(Suaedasalsa)种群生长与分解模型,对比了盐地碱蓬生物量与枯落物生物量的年变化过程,并解析了不同温度(原始温度、升温2.5℃、5℃)与植物枯落物分解状况的关系。模型结果表明,盐地碱蓬生物量与枯落物生物量年变化过程有显著差异,地上和地下生物量年变化过程为快速增长-稳定不变-快速减少,地上、地下枯落物生物量年变化过程为下降-急速上升-下降;温度升高会导致枯落物生物量增加和分解量降低,从而增加枯落物有机质量,使碳释放量减少。本研究揭示了在全球变暖的大环境下,滨海湿地植物枯落物分解变化情况,有助于深入了解滨海湿地植被在碳源汇过程中的作用。

Litter decomposition of intertidal wetland plants is related to the environmental temperature. The Suaeda salsa population growth and litter decomposition model was constructed in this study using the STELLA software based on the principle of System Dynamics. The annual biomass of the plants was compared with the litter decomposition within different temperature scenarios(initial temperature, raised by 2.5℃, and 5℃) resolved after simulation. The model results showed that there were significant differences in the annual changes of biomass between the plants and the litter. The trends in annual changes to aboveground and underground biomass were shown as rapid growth(stable and constant) followed by fast-decreased, while the annual changes in the aboveground and underground litter were decline-rapid and rise-decline. The increment in temperature led to the increase of the biomass and decrease of the litter decomposition, which caused the augmentation of litter organic mass and reduction of carbon release. This study has revealed the decomposition and changes that have taken placein plant litter in coastal wetlands in the context of global warming, which has been conducive to the in-depth understanding of the role of coastal wetland vegetation in the process of carbon source and sink.