DOI: 10.1016/j.foreco.2014.06.025
Scopus记录号: 2-s2.0-84904071138
论文题名: Response of tree regeneration to experimental gap creation and deer herbivory in north temperate forests
作者: Forrester J.A. ; Lorimer C.G. ; Dyer J.H. ; Gower S.T. ; Mladenoff D.J.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2014
卷: 329 起始页码: 137
结束页码: 147
语种: 英语
英文关键词: Acer saccharum
; Canopy gaps
; Height growth
; Northern hardwoods
; Shade tolerance
; Stump sprouts
Scopus关键词: Growth rate
; Hardwoods
; Acer saccharum
; Canopy gaps
; Height growth
; Northern hardwoods
; Shade tolerance
; Stump sprouts
; Reforestation
; deer
; gap dynamics
; growth response
; herbivory
; overstory
; regeneration
; shade tolerance
; temperate forest
; Acer Saccharum
; Growth Rate
; Hardwoods
; Reforestation
; United States
; Wisconsin
英文摘要: Structural heterogeneity has become a goal of contemporary forest management, yet the effect of incorporating variable sized canopy openings characteristic of older forests on ecosystem services is still largely unknown. Single-tree selection silviculture reduces tree species diversity, and group-selection harvests often produce inconsistent results in maintaining the proportion of species with low or intermediate shade tolerance. It is unclear how much variability is related to inherent growth rate differences among shade tolerance classes, asymmetric competition, sprouting behavior, herbivory, and other factors. We conducted an experiment to control several of these factors. The northern hardwood study area in north-central Wisconsin included 15 replicates of each of 3 sizes of experimental gaps (50m2, 200m2, and 380m2). Ten main plots (80×80m2) were fenced to exclude deer. Vertical height growth of saplings and stump sprouts was monitored for two years pre-treatment and four years post-treatment. Overstory gaps significantly increased height growth rates, but there was no significant difference between rates of the very shade-tolerant Acer saccharum and several midtolerant species in any gap size. Saplings dominated the regeneration layer in small gaps. Stump sprouts were more abundant and grew faster than saplings in large gaps, but after 4. years, A. saccharum advance regeneration still predominated in the upper height classes. Deer had limited effects on sapling development or species composition because tall advance regeneration was beyond their reach, but they severely affected the sprout layer. In unfenced plots, the unpalatable Ostrya viriginiana had the tallest sprouts. Overall, midtolerant species made up about 16% of the gap regeneration layer and appear to be increasing their proportion over time. Height growth rates of many saplings and sprouts exceeded 50. cm per year, suggesting that successful gap capture would be likely for both shade-tolerance groups under current environmental conditions. The non-significant difference in growth rates between shade-tolerant and midtolerant species across the light gradient could change as more time elapses since gap creation. However, our findings after four years are consistent with other studies in suggesting that there may be no consistent trends in the relative growth responses of shade-tolerant and midtolerant tree species to increased light and gap size. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65823
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Forest and Wildlife Ecology, University of Wisconsin-Madison, Madison, WI 53706, United States
Recommended Citation:
Forrester J.A.,Lorimer C.G.,Dyer J.H.,et al. Response of tree regeneration to experimental gap creation and deer herbivory in north temperate forests[J]. Forest Ecology and Management,2014-01-01,329