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Using Vegetative Nutrient Stocks to Compare Restored and Reference Wetlands in the Upper Klamath Basin, Oregon

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Abstract

Vegetative diversity metrics are often used to characterize wetland restoration success. Here we examine whether other important vegetative traits (nutrient standing stocks and tissue nutrient concentrations) can improve our understanding of the structure of restored and reference wetlands and aid in the assessment of functional equivalency. We focus on wetlands of the Upper Klamath Basin (UKB), Oregon because this basin supports a mosaic of remnant, restored, and degraded wetlands dominated by a limited number of common emergent plant species. We summarize nutrient standing stocks using 11 growth limiting micro- and macronutrients present in aboveground tissues of three emergent plant species. We show that interspecific variation in nutrient standing stocks and tissue nutrient concentrations was high and greater than inter-site differences. Interspecific variation for nitrogen standing stocks was 3X larger than inter-site variation. Although less common, inter-site differences in nutrient standing stocks and tissue nutrient concentrations were detected and tissue phosphorus concentrations in a recently restored wetland were nearly twice those of a reference wetland; corresponding levels of aboveground biomass in this wetland were not detected. Our detection of elevated phosphorus in the vegetation of a recently restored wetland is consistent with predictions from both experimental and observational work in UKB and demonstrates that nutrient standing stocks provide important clues about the fate and retention of nutrients in restoration wetlands. Importantly, we show that these vegetative attributes also provide a measure of functional equivalency that is rarely used in the assessment of restoration success.

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Acknowledgements

The U.S. Bureau of Reclamation (R10AP20603 and 08FG200155 to AMR) and U.S. Bureau of Land Management providing funding for this work. The U.S. Fish and Wildlife Service and The Nature Conservancy of Oregon provided access to field sites and logistical support. We would especially like to thank C. Doehring, C. Fujishin, H. Hendrixson, C. Erdman, and S. Wong for help in the field. We thank R. Inouye, S. Wong, H. Ray, and H. Hendrixson for their thoughtful reviews of earlier versions of this manuscript. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

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Correspondence to Andrew M. Ray.

Appendices

Appendix 1

Table 6 Summary of the nutrient standing stocks present in monospecific stands of vegetation in wetlands of Upper Klamath Basin. Standings stocks were estimated as the product of percentages of each element and the aboveground biomass present. Comparisons include tissues collected from three plant species, Schoenoplectus acutus var. acutus, Sparganium eurycarpum, and Typha latifolia, from three wetlands. All samples of the same species (regardless of wetland site) were pooled in order to make among species comparisons. The total number of samples from each species are shown in Table 1. Standing stocks are presented as gram dry mass of each element per m2. Species with standing stock groups that share the same letter are not significantly different at P = 0.05. Coefficient of variation (CV) values were derived from log-transformed nutrient standing stock data

Appendix 2

Table 7 Summary of the nutrient concentrations present in plant tissues from wetlands of Upper Klamath Basin. Comparisons include tissues collected from three plant species, Schoenoplectus acutus var. acutus, Sparganium eurycarpum, and Typha latifolia, and from three wetlands. Elements are expressed as either percentages (mass/mass) or in parts per million (ppm); boron, copper, iron, manganese, and zinc are expressed as ppm. Species within an element group that share the same letter are not significantly different at P = 0.05. Coefficient of variation (CV) values were derived from log-transformed tissue nutrient percentage data

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Ray, A.M., Hamilton, A., Aquino, C. et al. Using Vegetative Nutrient Stocks to Compare Restored and Reference Wetlands in the Upper Klamath Basin, Oregon. Wetlands 32, 827–839 (2012). https://doi.org/10.1007/s13157-012-0313-9

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