scholarly journals Endogenous and exogenous controls of root life span, mortality and nitrogen flux in a longleaf pine forest: root branch order predominates

2008 ◽  
Vol 96 (4) ◽  
pp. 737-745 ◽  
Author(s):  
Dali Guo ◽  
Robert J. Mitchell ◽  
Jennifer M. Withington ◽  
Ping-Ping Fan ◽  
Joseph J. Hendricks
Keyword(s):  
Life Span ◽  
Longleaf Pine ◽  
Pine Forest ◽  
Nitrogen Flux ◽  
Branch Order ◽  
Root Branch Order ◽  
Root Life Span

scholarly journals INSECT POLLINATORS OF THREE RARE PLANTS IN A FLORIDA LONGLEAF PINE FOREST

2002 ◽  
Vol 85 (2) ◽  
pp. 308-316 ◽  
Author(s):  
Theresa L. Pitts-Singer ◽  
James L. Hanula ◽  
Joan L. Walker
Keyword(s):  
Longleaf Pine ◽  
Rare Plants ◽  
Pine Forest ◽  
Insect Pollinators

The effect of spatially variable overstory on the understory light environment of an open-canopied longleaf pine forest

2002 ◽  
Vol 32 (11) ◽  
pp. 1984-1991 ◽  
Author(s):  
Michael A Battaglia ◽  
Pu Mou ◽  
Brian Palik ◽  
Robert J Mitchell
Keyword(s):  
Spatial Variation ◽  
Spatial Patterns ◽  
Longleaf Pine ◽  
Light Availability ◽  
Canopy Structure ◽  
Basal Area ◽  
Pinus Palustris ◽  
Pine Forest ◽  
Large Group ◽  
The Relationship

Spatial aggregation of forest structure strongly regulates understory light and its spatial variation in longleaf pine (Pinus palustris Mill.) forest ecosystems. Previous studies have demonstrated that light availability strongly influences longleaf pine seedling growth. In this study, the relationship between spatial structure of a longleaf pine forest and spatial pattern of understory light availability were investigated by comparing three retention harvest treatments: single-tree, small-group, large-group, and an uncut control. The harvests retained similar residual basal area but the spatial patterns of the residual trees differed. Hemispherical photographs were taken at 300 stations to calculate gap light index (GLI), an estimate of understory light availability. Stand-level mean, variation, and spatial distribution of GLI were determined for each treatment. By aggregating residual trees, stand mean GLI increased by 20%, as well as its spatial variation. Spatial autocorrelation of GLI increased as the size of the canopy gaps increased and the gaps were better defined; thus, the predictability of GLI was enhanced. The ranges of detrended semivariograms were increased from the control to the large-group harvest indicating the spatial patterns of understory GLI became coarser textured. Our results demonstrated that aggregated canopy structure of longleaf pine forest will facilitate longleaf pine seedling regeneration.

scholarly journals Elevated CO2 and O3 Effects on Fine-Root Life Span in Ponderosa Pine

2009 ◽  
Author(s):  
Donald Phillips ◽  
Mark Johnson ◽  
David Tingey ◽  
Marjorie Storm
Keyword(s):  
Life Span ◽  
Elevated Co2 ◽  
Ponderosa Pine ◽  
Fine Root ◽  
Elevated Co2 And O3 ◽  
Root Life Span

Soil Chemistry in a Loblolly/Longleaf Pine Forest with Interval Burning

1992 ◽  
Vol 2 (2) ◽  
pp. 157-164 ◽  
Author(s):  
Dan Binkley ◽  
Dan Richter ◽  
Mark B. David ◽  
Bruce Caldwell
Keyword(s):  
Soil Chemistry ◽  
Longleaf Pine ◽  
Pine Forest

scholarly journals Differential variation of NSCs in root branch orders of Fraxinus mandshurica Rupr. seedlings across different drought intensities and soil substrates

2021 ◽  
Author(s):  
Li Ji ◽  
Yue Liu ◽  
Jun Wang ◽  
Zhimin Lu ◽  
Yuchun Yang ◽  
...  
Keyword(s):  
Fine Roots ◽  
Fine Root ◽  
Sandy Loam ◽  
Starch Content ◽  
Soluble Sugar ◽  
Root Traits ◽  
Drought Intensity ◽  
Branch Order ◽  
Root Branch Order ◽  
Loam Soil

Non-structural carbohydrates (NSCs) facilitate plants adapt to drought stress, could characterize trees growth and survival ability and buffer against external disturbances. Previous studies have focused on the distribution and dynamics of NSCs among different plant organs under drought conditions. However, discussion about the NSC levels of fine roots in different root branch order were little, especially the relationship between fine root trait variation and NSCs content. The aim of the study is to shed light into the synergistic variation of fine root traits and NSC content in different root branch order under different drought and soil substrate conditions. 2-year-old Fraxinus mandshurica Rupr. potted seedlings were planted in three different soil substrates (humus, loam and sandy-loam soil) and conducted to four drought intensities (CK, mild drought, moderate drought and severe drought) for two months. With the increase of drought intensity, the biomass of fine roots decreased significantly. Under the same drought intensity, seedlings in sandy-loam soil have higher root biomass, and the coefficient of variation of fifth-order roots (37.4%, 44.5% and 53.0% in humus, loam and sandy loam, respectively) is higher than that of lower-order roots. With the increase of drought intensity, the specific root length (SRL) and average diameter (AD) of all five orders increased and decreased, respectively. The fine roots in humus soil had higher soluble sugar content and lower starch content. Also, the soluble sugar and starch content of fine roots showed decreasing and increasing tendency respectively. Soluble sugar and starch explain the highest degree of total variation of fine root traits, that is 32.0% and 32.1% respectively. With ascending root order, the explanation of the variation of root traits by starch decreased (only 6.8% for fifth-order roots). The response of different root branch order fine root morphological traits of F. mandshurica seedlings to resource fluctuations ensures that plants maintain and constructure the root development by an economical way to obtain more resources.

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