Soil and plant characteristics during two hydrologically contrasting years at the lakeshore wetland of Poyang Lake, Chin
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SOILS, SEC 3 • REMEDIATION AND MANAGEMENT OF CONTAMINATED OR DEGRADED LANDS • RESEARCH ARTICLE
Soil and plant characteristics during two hydrologically contrasting years at the lakeshore wetland of Poyang Lake, China Ruichang Shen 1,2,3,4,5 & Zhichun Lan 1,2,3,4,6 & Xingyun Huang 1,3,4 & Yasong Chen 1,3,4 & Qiwu Hu 7 & Changming Fang 2 & Binsong Jin 1,3 & Jiakuan Chen 2 Received: 15 August 2019 / Accepted: 22 April 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose The main objective of this research was to examine the effects of inter-annual water regime variation on soil and plant characteristics, and soil–vegetation relationship at the lakeshore wetland of Poyang Lake, China. Materials and methods Six transects which paralleled the lakeshore were established at a typical Carex lakeshore wetland of Poyang Lake. We performed the field investigation and sampling in the autumn growing seasons in a flooding year (2017) and a drought year (2018). Paired t test was carried out to determine the effects of inter-annual water regime variation on various soil and plant parameters. Redundancy analysis was used to examine the relationships of plant species composition with flooding and soil variables in both years. Results and discussion Soil water content (SW), soil organic carbon (SOC), total nitrogen (TN), total phosphorus (TP), the ratio of SOC to TP (C/P ratio), the ratio of TN to TP (N/P ratio), ammonia nitrogen concentration (NH4-N), and nitrate nitrogen concentration (NO3-N) were 21 ~ 71% higher in the flooding year than in the drought year. Plant Shannon–Wiener indices were significantly lower in the drought year than in the flooding year, whereas aboveground and belowground plant biomass showed opposite patterns. Flooding and soil variables could strongly determine plant communities in both years. Flooding duration was the most important variable among all flooding and soil variables. After eliminating the effects of flooding duration, pH and SW still significantly affected plant community composition in the flooding year, while only NH4-N significantly impacted on plant species distribution in the drought year. Conclusions The results provided direct evidences that the inter-annual water regime variation not only could dramatically modify soil and plant variables but also could change the soil–vegetation relationship in the wetlands. Our studies have great implications for the conservation and restoration of the wetlands, especially for the lake wetlands in the middle and lower reaches of Yangtze River. Keywords Inter-annual water regime variation . Soil . Plant community . Soil–vegetation relationship . Poyang Lake
Responsible editor: Shiming Ding * Jiakuan Chen [email protected] 1
Jiangxi Province Key Laboratory of Watershed Ecosystem Change and Biodiversity, Center for Watershed Ecosystem, Institute of Life Science and School of Life Science, Nanchang University, Nanchang 330031, China
2
Institute of Biodiversity Science, Fudan University, Shanghai 200433, China
3
Natio
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