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

作     者：Jianwei Zhang Matt D.Busse Gary O.Fiddler Ed Fredrickson Jianwei Zhang;Matt D.Busse;Gary O.Fiddler;Ed Fredrickson

作者机构：USDA Forest ServicePacific Southwest Research Station3644 Avtech ParkwayReddingCA 96002USA USDA Forest ServicePacific Southwest Region3644 Avtech ParkwayReddingCA 96002USA Thunder Road Resources21169 Falling Leaf RdReddingCA 96003USA 

出 版 物：《Journal of Forestry Research》 (林业研究（英文版）)

年 卷 期：2020年第31卷第4期

页      面：1445-1451页

核心收录：

学科分类：07[理学] 0713[理学-生态学] 

基　　金：This work was supported by Forest Service Agenda 2020 Program and Sierra Cascade Intensive Forest Management Research Cooperative 

主　　题：Competing vegetation control Manzanita Nitrogen-fixing Ceanothus Pinus ponderosa growth Shrub cover 

摘      要：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.