Honors College Thesis
 

Astragalus peckii Population Establishment : Developing Protocols for Seed Germination, Seedling Cultivation, and Planting

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  • Astragalus peckii Piper is a threatened Oregon endemic in the pea family (Fabaceae). This species faces extinction due to loss of habitat. Recovery efforts include augmenting existing populations and creating new ones. The purpose of this study was to determine the best methodology for population augmentation of Astragalus peckii by evaluating methodologies for 1) seed germination and seedling cultivation, and 2) transplant survival and seed emergence. Older seeds required manual scarification to induce germination while younger seeds germinated without treatment. Seedlings were placed in three soil treatments with varying ratios of potting mix and native soil. Seedlings experienced high rates of mortality unrelated to treatment. Seeds and seedlings were planted in the fall along four transects of varying disturbance and previous species occupation. Spring survival rates provided little evidence for an increase in population size of Astragalus peckii in the four transects after planting.
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