DOI: 10.1016/j.foreco.2016.04.053
Scopus记录号: 2-s2.0-84967222027
论文题名: Long-term thinning alters ponderosa pine reproduction in northern Arizona
作者: Flathers K.N. ; Kolb T.E. ; Bradford J.B. ; Waring K.M. ; Moser W.K.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2016
卷: 374 起始页码: 154
结束页码: 165
语种: 英语
英文关键词: Pinus ponderosa
; Regeneration
; Seedling establishment
; Silviculture
; Soil water content
Scopus关键词: Climate change
; Reforestation
; Soil moisture
; Soils
; Pinus ponderosa
; Regeneration
; Seedling establishment
; Silviculture
; Soil water content
; Forestry
; basal area
; climate effect
; coniferous forest
; diameter
; experimental study
; forest health
; future prospect
; germination
; growth rate
; long-term change
; mortality
; regeneration
; reproduction
; restoration ecology
; seedling establishment
; silviculture
; soil water
; thinning
; water content
; Arizona
; United States
; Pinus ponderosa
; Pinus ponderosa var. scopulorum
英文摘要: The future of ponderosa pine (Pinus ponderosa var. scopulorum) forests in the southwestern United States is uncertain because climate-change-induced stresses are expected to increase tree mortality and place greater constraints on regeneration. Silvicultural treatments, which include thinning, are increasingly being used to address forest health concerns by restoring ponderosa pine forests to more open conditions representative of historical forest structure. In light of the greater use of thinning and mounting concerns about the future of the species at the southern edge of its range, further investigations about impacts of thinning on ponderosa pine regeneration and underlying mechanisms are needed. We used a long-term (>50 years) experiment in northern Arizona to investigate impacts of repeated stand thinning that maintained different growing stock basal areas (0, 7, 14, 23, 34, 66 m2 ha-1) on early seedling survival, growth, and microenvironment. Seedling survival for the first two years after germination (2013-2015), which had above-average precipitation, was higher than reported in several earlier studies and ranged between 4 and 21% among all basal areas. Seedling density exhibited a negative quadratic relationship with basal area and was positively associated with litter cover. Growing stock levels that fostered the highest seedling survival and density were those with a low density of overstory trees, low canopy cover, high cone production, coverage of soil by a thin layer of litter, and high soil water content at a depth of 15-30 cm. Overstory basal area was positively associated with seedling height but negatively associated with seedling diameter. During this relatively wet period, all basal area treatments supported higher average seedling densities than those previously recommended to produce a multi-aged stand or presettlement structure in the southwestern United States. Our results show that long-term maintenance of low to intermediate basal areas (7-23 m2 ha-1) by thinning over the last 50 years led to a favorable microenvironment for early seedling establishment of ponderosa pine. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64872
Appears in Collections: 影响、适应和脆弱性
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作者单位: School of Forestry, Northern Arizona University, Flagstaff, AZ, United States; US Geological Survey, Southwest Biological Science Center, Flagstaff, AZ, United States; U.S.D.A. Forest Service Rocky Mountain Research Station, Forest and Woodland Ecosystems Science, Flagstaff, AZ, United States
Recommended Citation:
Flathers K.N.,Kolb T.E.,Bradford J.B.,et al. Long-term thinning alters ponderosa pine reproduction in northern Arizona[J]. Forest Ecology and Management,2016-01-01,374