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首页> 美国政府科技报告 >Second-Year Results of an Investigation into the Life History and Population Dynamics of Calochortus nitidus Dougl. (Liliaceae)
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Second-Year Results of an Investigation into the Life History and Population Dynamics of Calochortus nitidus Dougl. (Liliaceae)

机译：Calochortus nitidus Dougl。的生活史和种群动态调查的第二年结果。 （百合科）

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Detailed data on the morphology, life history, and reproductive biology of Calochortus nitidus, a Federal Candidate Plant Species, has been collected during two consecutive field seasons from permanent plots on the Nez Perce National Forest. These data suggest that about 25% of a population is reproductive in a given year. Nearly all of the buds produced in a given year are nipped, mostly by cattle, prior to fruit set. Reproductive success, as measured by the percentage of buds produced which develop into mature fruit, was about 5% during the first year and slightly greater than 10% in the second year. Herbivory by small mammals also appears to significantly lower the reproductive success of some populations; this is thought to be a local phenomenon of little detriment to the overall population. Field observations over a three-year period suggest that the abundance of plants in individual populations may be maintained at current levels, or perhaps even enhanced, by a rest-rotation grazing system. It is recommended that a simple, multi-year experiment be conducted to determine the effects of exclusion from grazing, grazing on an annual basis, and grazing with a resting period every third year, on the species. These data will then be used to design and implement a Habitat Management Plan for the species on public lands administered by the US Forest Service.

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