DOI: 10.1016/j.foreco.2012.11.038
Scopus记录号: 2-s2.0-84871854846
论文题名: Sunfleck effects on physiology, growth, and local demography of American ginseng (Panax quinquefolius L.)
作者: Wagner A. ; McGraw J.B.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2013
卷: 291 起始页码: 220
结束页码: 227
语种: 英语
英文关键词: American ginseng
; Local demography
; Panax quinquefolius
; Photosynthesis
; Sunflecks
Scopus关键词: American ginseng
; Cluster formations
; Data logger
; Dependent variables
; Diffuse light
; Direct solar radiation
; Forest understory
; Germination rates
; Growth response
; Light environment
; Light-saturated photosynthetic rate
; Linear relationships
; Local demography
; Low level
; Natural variation
; Panax quinquefolius
; Photosynthetic photon flux densities
; Population census
; Population growth
; Relative growth rate
; Seed germination
; Seed production
; Short periods
; Sunflecks
; Understory light
; Varying lights
; Cultivation
; Forestry
; Photosynthesis
; Physiology
; Plants (botany)
; Seed
; Transpiration
; Population statistics
; census
; demography
; dicotyledon
; germination
; growth rate
; growth response
; light effect
; photon flux density
; physiological response
; seed production
; solar radiation
; transpiration
; understory
; United States
; Panax ginseng
; Panax quinquefolius
英文摘要: The light environment of the forest understory is heterogeneous, characterized by low levels of diffuse light punctuated by short periods of direct solar radiation known as sunflecks. Less well understood is the degree to which sunflecks are responsible for spatially varying performance of understory plants. We studied natural variation in the light environment, as well as physiology, growth, and microsite demographics of American ginseng (Panax quinquefolius L.) to test whether clustering of plants within a population was related to sunfleck variation. HOBO dataloggers were positioned in 10 clusters within a single ginseng population to measure the local understory light environment during mid-season (June 27 to August 9 2011). Photosynthesis and transpiration were measured with a Li-Cor 6400 portable photosynthesis system. Population census data were used to obtain measurements of the relative growth rate (2011-2012), seed production efficiency (2011) and seed germination (2009-2012) of plants in the same subpopulations. All measured dependent variables were regressed against the percentage of mean photosynthetic photon flux density contributed from sunflecks and mean length of the longest sunfleck. Light saturated photosynthetic rates of ginseng showed a positive linear relationship to both sunfleck characteristics, while transpiration was unaffected. The relative growth rate of established ginseng plants also had a positive linear relationship with the length of the longest sunfleck. However, germination rate was negatively affected by an increasing percentage of photosynthetic photon flux density from sunflecks. Seed production efficiency was not influenced by either sunfleck characteristic. Due to negative effects on germination, initial ginseng cluster formation is likely not associated with sunflecks, however photosynthetic and growth responses suggest that fitness effects are positive for established individuals. A spatially and temporally varying light environment is beneficial for ginseng population growth. © 2012 . Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66774
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Biology, West Virginia University, Life Sciences Building, PO Box 6057, Morgantown, WV 26506-6057, United States
Recommended Citation:
Wagner A.,McGraw J.B.. Sunfleck effects on physiology, growth, and local demography of American ginseng (Panax quinquefolius L.)[J]. Forest Ecology and Management,2013-01-01,291