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Thirteen-year growth response of ponderosa pine plantations to dominant shrubs(Arctostaphylos and ceanothus)

Journal of Forestry Research 2020年第4期31卷 1445-1451页

作者： Jianwei Zhang Matt D.Busse Gary O.Fiddler Ed Fredrickson USDA Forest Service Pacific Southwest Research Station3644 Avtech ParkwayReddingCA 96002USA USDA Forest Service Pacific Southwest Region3644 Avtech ParkwayReddingCA 96002USA Thunder Road Resources 21169 Falling Leaf RdReddingCA 96003USA

Thirteen-year growth response of ponderosa pine to various manipulations of understory vegetation was studied to determine if a threshold of understory cover can be established for plantation productivity and whether nitrogen-fixing ceanothus species benefit plantation growth compared to non N-fixing Arctostaphylos species,given their ability to improve site *** showed that completely controlling competing vegetation increased plantation growth,as was universally expected,but the effects of partial shrub control on plantation performance was *** did not find a benefit of nitrogenfixing shrubs on tree growth,as young plantation growth was slightly better in the non N-fixing plots compared to the N-fixing plots due to differences in shrub *** understory cover threshold for tree growth was not *** to the overriding effect of shrub competition,controlling herbaceous species had little effect on plantation growth even though it benefited tree seedling survival.A long-term value of N-fixing shrubs at these sites,if there is one,must be balanced by successful plantation establishment and rapid early growth.

关键词： Competing vegetation control Manzanita nitrogen-fixing ceanothus Pinus ponderosa growth Shrub cover

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