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首页> 美国政府科技报告 >Vegetation Trends in a 31-Year-Old Ponderosa Pine Plantation: Effect of DifferentShrub Densities
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Vegetation Trends in a 31-Year-Old Ponderosa Pine Plantation: Effect of DifferentShrub Densities

机译：31年生黄松人工林的植被变化趋势：不同密度的影响

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On a poor site in northern California, a brushfield community was treated invarious ways which left initial densities of no shrubs, light, medium, and heavy shrubs. Density and development (height, foliar cover, crown volume) for three shrub species (alone and combined), one grass, and planted ponderosa pine in these categories were quantified from 1966 to 1992. Successional trends (ascendance and decline) are presented for these species and for forbs from 1962 (the date pines were planted) through 1992. Regression equations that model density and development are presented for the shrubs and pine. In general, greenleaf manzanita prospered during the study; snowbrush initially developed well, but then declined; Sierra plum endured, but was relegated to the understory; needlegrass invaded rapdily, peaked early, and was mostly gone by the end of the study. Only a trace of forb species remained by study end. Needlegrass displayed strong environmental preference, becoming dense and developing well in shrub-free areas, but was scarcely present in heavy shrubs. Ponderosa pine grew

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