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- W2185820302 abstract "California grasslands are complex, unique ecosystems comprised of many species of native and nonnative vegetation. One group of species widely used for range improvement is the Trifolium (wild clover) genus. However, Trifolium are among the more understudied vegetation types. Trifoliums are important to grassland ecosystems because they replenish deficient nitrogen in N-limited ecosystems and serve as forage when food is scarce. Therefore, understanding clover abundance in relation with environmental variables is important in the management of California's vulnerable grasslands. To examine these relationships an observational study was conducted in 63 plots within seven parks of the East Bay Regional Park District over three years (2005-2007). Variables tested relating to Trifolium abundance included geographical variables (slope, aspect, elevation, and heat load) and soil composition (total N, total C, P, X-Ca, sand, silt, clay, and pH). Of the Trifolium found, the majority came from a single nonnative species, T. hirtum. With the use of linear regressions, this study found Trifolium spp. abundance positively related to slope ( 2 =0.22, p=0.01) and elevation ( 2 =0.25, 0.02) throughout the three-year time frame. Other relationships were observed including a positive relationship to silt (R 2 =0.20, p=<0.01) in 2005, a negative relationship to pH (R 2 =0.10, p=0.05) in 2005, and negative relationships to total N ( 2 =0.15, and total C ( 2 =0.57, in 2006 and 2007. This research provides an important description of variables that may influence the abundance and distribution of Trifolium spp. in the East Bay." @default.
- W2185820302 created "2016-06-24" @default.
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- W2185820302 date "2008-01-01" @default.
- W2185820302 modified "2023-09-26" @default.
- W2185820302 title "The Relationship between Trifolium spp. Abundance and Environmental Variables in East Bay Grasslands" @default.
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