Germination potential of baldcypress (Taxodium distichum) swamp soil seed bank along geographical gradients

The Science of the Total Environment
Ting Lei, Beth A Middleton

Abstract

Changing environments of temperature, precipitation and moisture availability can affect vegetation in ecosystems, by affecting regeneration from the seed bank. Our objective was to explore the responses of soil seed bank germination to climate-related environments along geographic gradients. We collected seed banks in baldcypress (Taxodium distichum) swamps along the Mississippi River and the Gulf of Mexico Coast in the United States, which have distinct temperature and/or precipitation gradients, and germinated them in a greenhouse. The frequency, richness and seed density of species germinated from the seed bank were compared between various geographic locations, experimental water regimes (saturated, flooded) and wetland types (tidal, non-tidal and inland swamps). We also analyzed the relationship of seed density to the environment by using a Non-metric Multi-dimensional Scaling (NMDS) model. Sixty-one species germinated from the seed bank, differing in pattern by geographic location, experimental water regime and wetland type. The foundation species (i.e., T. distichum and Cephalanthus occidentalis) germinated with a niche affinity for the northern part of the latitudinal gradient (Tennessee and Illinois) and these species...Continue Reading

References

Sep 23, 2000·Science·D R EasterlingL O Mearns
Dec 15, 2010·Proceedings of the National Academy of Sciences of the United States of America·Daniel R CayanAlexander Gershunov
Nov 26, 2015·Science Advances·Benjamin I CookJason E Smerdon
Apr 12, 2016·Global Change Biology·Karl HülberStefan Dullinger
Jan 31, 2018·Proceedings of the National Academy of Sciences of the United States of America·Sabine B RumpfStefan Dullinger

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