A dataset of wetland plants and soil carbon, nitrogen, phosphorus, and trace elements under across different elevation gradients in Poyang Lake

<p indent="0mm">Wetland hydrological processes have a significant impact on wetland carbon storage. However, the mechanisms by which they affect biomass and carbon storage by regulating soil nutrient content and plant diversity remain underexplored. From June 4th, 2018 to April 10th, 2019, we conducted daily monitoring of daily water levels, plant diversity and dominance, aboveground and underground plant biomass, as well as soil content of 10 elements (carbon, nitrogen, phosphorus, potassium, sodium, calcium, magnesium, iron, manganese, and zinc) under different elevation gradients in the internationally significant Poyang Lake Wetland, resulting in the formation of a comprehensive dataset. The dataset consists of one Excel file with five sheets, covering plant directory, individual plant numbers, plant biomass, soil element content, and daily water levels for 21 sample plots across seven elevation gradients. The quality of dataset is mainly controlled and evaluated from the aspects of precise design of the plant survey scheme, fine collection of plant and soil samples, laboratory processing and data entry, and third-party calibration. This dataset can provide data support for revealing the process mechanisms among hydrology, soil nutrients, plant biomass, and soil carbon, as well as those between plant dominance, plant biomass soil carbon. It offers an in-depth understanding of how wetland hydrological processes influence vegetation growth and carbon sequestration by regulating nutrient enrichment, thereby laying a new foundation for understanding carbon-water coupling mechanisms.