春季降雨分配变化对黄河三角洲滨海湿地优势种的影响

Effects of Spring Rainfall Distribution on Dominant Vegetation in a Coastal Wetland of the Yellow River Delta

滨海湿地生态系统与其他陆地生态系统相比固碳速度更快,被称为地球上的“蓝色碳汇”,该生态系统拥有高初级生产力及低有机质分解速度。气候改变情况下,湿地土壤的水分与盐分含量因为大气降水时间分配不均匀而发生变化,进而干扰植株代谢,最终改变该地植株的生理特性。2019-2020年的监测数据表明:春季大气降水增多时,2019与2020年芦苇与白茅的生长指标(株高、株数、盖度)会增大,而碱蓬的植株高度则会减小。

Compared with other terrestrial ecosystems,coastal wetland ecosystems sequester carbon faster and are known as the"blue carbon sink"on earth,which has high primary productivity and low decomposition rate of organic matter.Under the condition of climate change,soil moisture and salt content in wetland will change due to the uneven time distribution of atmospheric precipitation,which will interfere with plant metabolism and eventually change the physiological characteristics of plants in this area.Monitoring data from 2019 to 2020 indicate that the growth indexes(plant height,plant number and coverage)of PHRagmites australis and Imperata cylindrica will increase in 2019 and 2020,while the plant height of Suaeda suaeda will decrease when atmospheric precipitation increases in spring.