Plant traits of propagule banks and standing vegetation reveal flooding alleviates impacts of agriculture on wetland restoration

1. Restoration of degraded plant communities requires understanding of community assembly processes. Human land use can influence plant community assembly by altering environmental conditions and species’ dispersal patterns. Flooding, including from environmental flows, may counteract land use effects on wetland vegetation. We examined the influence of land use history and flood frequency on the functional composition of wetland plant communities along a regulated river. 2. We applied fourth corner modelling to determine species’ trait-based responses to flooding and land use by combining data on i) the occupancy and abundance of species in propagule banks and standing vegetation, ii) species traits, and iii) environmental conditions of 22 standing vegetation and 108 soil propagule bank study sites. We used analysis of deviance to test how well each dataset characterised trait–environment interactions, and generalised linear models to identify traits related to species’ responses. 3. Th...1. 退化植物群落的修复有赖于对群落组装过程的明晰认知。人类土地利用可通过改变环境条件与物种扩散模式，对植物群落组装产生影响。由环境流量（environmental flows）引发的洪水，或可抵消土地利用对湿地植被的影响。本研究针对某受调控河流沿岸的湿地植物群落，探究了土地利用历史与洪水发生频率对其功能组成的影响。 2. 本研究结合三类数据集开展分析：① 22个现存植被样地与108个土壤繁殖体库（propagule banks）样地中，物种在繁殖体库与现存植被中的占据度与多度数据；② 物种功能性状数据；③ 样地环境条件数据，以此通过四角落模型（fourth corner modelling）明确物种基于功能性状对洪水与土地利用的响应模式。随后采用偏差分析（analysis of deviance）检验各数据集对性状-环境相互作用的表征能力，并借助广义线性模型（generalised linear models）筛选与物种响应相关的功能性状。 3. （原文内容未完整呈现）