globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.foreco.2012.09.026
Scopus记录号: 2-s2.0-84870176694
论文题名:
Effects of thinning on litterfall were found after years in a Pinus halepensis afforestation area at tree and stand levels
作者: Navarro F.B.; Romero-Freire A.; Del Castillo T.; Foronda A.; Jiménez M.N.; Ripoll M.A.; Sánchez-Miranda A.; Huntsinger L.; Fernández-Ondoño E.
刊名: Forest Ecology and Management
ISSN:  0378-1127
出版年: 2013
卷: 289
起始页码: 354
结束页码: 362
语种: 英语
英文关键词: Aleppo pine ; DBH ; Needles ; SE Spain ; Semiarid ; Stand density
Scopus关键词: Aleppo pine ; Basal area ; Biomass productions ; Canopy cover ; DBH ; Global change ; Linear relationships ; Litterfalls ; Low density ; Random position ; Seasonal distributions ; Seasonal peaks ; Semiarid ; Stand densities ; Stand levels ; Thinning regimes ; Tree competition ; Tree density ; Tree level ; Tree size ; Reforestation ; Needles ; afforestation ; biological production ; coniferous forest ; forest management ; litterfall ; management practice ; Mediterranean environment ; phytomass ; semiarid region ; stand structure ; thinning ; Spain ; Pinus halepensis
英文摘要: Little is known about the litterfall dynamics and the effects of stand-management practices under semiarid Mediterranean conditions. Our aim was to provide data on the annual amount and the seasonal distribution of litterfall in a 15-year-old afforestation area of Aleppo pine under three different intensities of thinning applied 5years before the study, and to analyse the relationships between litterfall and tree and stand characteristics. Three different but typical overstory thinning regimes [75% of mean basal area removed (T75), 60% (T60), and 48% (T48)] were performed on 16 randomly established 20×20m plots [4 per treatment+4 control unthinned plots (T0)]. Two trees per plot (8 trees per stand) were randomly assigned for monthly litterfall measurements from June 2009 to May 2010. In each tree, three circular traps were hung in random positions below its canopy. In total, 32 trees were monitored by means of 96 traps (24 traps per stand). Annual litterfall showed two seasonal peaks, ranging from 0.95Mgha-1yr-1 in T75 to 2.28Mgha-1yr-1 in the unthinned control stands (T0). However, at the tree level, litterfall ranged from 4.0kg per treeyr-1 of total litterfall in T75 to 2.0kg per treeyr-1 for T0. Trees in T0 tended to shed more needles and twigs measured per m-2yr-1 than those at low densities, despite having less mean crown projection (T75=86gm-2yr-1; T60=91gm-2yr-1; T48=94gm-2yr-1; T0=102gm-2yr-1). Also, control trees shed a greater proportion (%) of needles and twigs with respect to the total amount of litterfall, mainly from August to November in all cases. Annual litterfall and needle fall showed a significant linear relationship with regard to tree size and stand density, canopy cover, basal area, and annual biomass production. Although only oneyear of data are shown and relative caution should be taken into account until further research is concluded, our results show that greater needle fall could be stimulated at high tree densities by tree competition for resources. Thus, this data may be used for planning forest management within a context of global change. © 2012 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66800
Appears in Collections:影响、适应和脆弱性

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作者单位: Grupo de Sistemas y Recursos Forestales, Área de Producción Ecológica y Recursos Naturales, IFAPA Centro Camino de Purchil, Junta de Andalucía, Camino de Purchil s/no, 18004 Granada, Spain; Dpto. Edafología y Química Agrícola, Facultad de Ciencias, Universidad de Granada, Campus Fuentenueva s/no, 18071 Granada, Spain; Dpto. Botánica, Facultad de Ciencias, Universidad de Granada, Campus Fuentenueva s/no, 18071 Granada, Spain; Department of Environmental Science, Policy and Management, College of Natural Resources, University of California, Berkeley, 137 Mulford Hall, Berkeley, CA 94720-3114, United States

Recommended Citation:
Navarro F.B.,Romero-Freire A.,Del Castillo T.,et al. Effects of thinning on litterfall were found after years in a Pinus halepensis afforestation area at tree and stand levels[J]. Forest Ecology and Management,2013-01-01,289
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