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Showing 1 to 12 of 1415 entries
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Thinning, fertilization, and crown position interact to control physiological responses of loblolly pine.

Tree physiology

Tang Z, Chambers JL, Guddanti S, Barmett JP.
PMID: 12651587
Tree Physiol. 1999 Feb;19(2):87-94. doi: 10.1093/treephys/19.2.87.

To examine physiological responses to thinning, fertilization, and crown position, we measured net photosynthesis (P(n)), transpiration (E), vapor pressure difference (VPD), stomatal conductance (g(s)), and xylem pressure potential (Psi(1)) between 0930 and 1130 h under ambient conditions in the...

Leaf gas exchange and cholorphyll fluorescence in relation to leaf angle, azimuth, and canopy position in the tropical pioneer tree, Macaranga conifera.

Tree physiology

Ishida A, Toma T, M.
PMID: 12651591
Tree Physiol. 1999 Feb;19(2):117-124. doi: 10.1093/treephys/19.2.117.

We tested the hypothesis that, in tropical pioneer tree species, vertical leaf angle contributes to high carbon gain because it minimizes damage caused by high irradiances. Diurnal changes in leaf gas exchange and chlorophyll fluorescence were measured in east-facing...

Developmental factors responsible for heterosis in aspen hybrids (Populus tremuloides x P. tremula.

Tree physiology

Li B, Howe GT, Wu R.
PMID: 12651296
Tree Physiol. 1998 Jan;18(1):29-36. doi: 10.1093/treephys/18.1.29.

Juvenile growth and bud set phenology were analyzed to study the biological basis of heterosis (hybrid vigor) in interspecific hybrids of Populus tremuloides Michx. (T) and P. tremula L. (Ta). Growth, measured as seedling volume index, was significantly higher...

Seasonal changes in leaf nitrogen pools in two Salix species.

Tree physiology

Kull O, Koppel A, Noormets A.
PMID: 12651298
Tree Physiol. 1998 Jan;18(1):45-51. doi: 10.1093/treephys/18.1.45.

Leaf nitrogen distribution pattern was studied four times during the growing season in a 2-year-old Salix viminalis L. and Salix dasyclados Wimm. plantation in Estonia. We measured the vertical distributions of leaf nitrogen concentration, dry mass, leaf area and...

Thigmomorphogenesis: a dose response to flexing in Ulmus americana seedlings.

Tree physiology

Telewski FW, Pruyn ML.
PMID: 12651301
Tree Physiol. 1998 Jan;18(1):65-68. doi: 10.1093/treephys/18.1.65.

Six-week-old half-sib seedlings of Ulmus americana L. were subjected to different amounts of flexure daily for 3 weeks under controlled greenhouse conditions. The daily flexure treatments were: no flexing in a staked stem, minimal flexing in a non-staked stem,...

Characterization of radiation regimes in nonrandom forest canopies: theory, measurements, and a simplified modeling approach.

Tree physiology

Kucharik CJ, Norman JM, Gower ST.
PMID: 12651308
Tree Physiol. 1999 Sep;19(11):695-706. doi: 10.1093/treephys/19.11.695.

We used field measurements and Monte Carlo simulations of canopy gap-size distribution and gap fraction to examine how beam radiation interacts with clumped boreal forest canopies of aspen (Populus tremuloides Michx.), black spruce (Picea mariana (Mill.) B.S.P.) and jack...

Impact of snow cover on photoinhibition and winter dessication in evergreen Rhododendron ferrugineum leaves during subalpine winter.

Tree physiology

Neuner G, Ambach D, Aichner K.
PMID: 12651311
Tree Physiol. 1999 Sep;19(11):725-732. doi: 10.1093/treephys/19.11.725.

Effects of winter snow cover on photoinhibition and possible interactions with winter desiccation were investigated in situ in an evergreen subalpine woody species, Rhododendron ferrugineum L., at the alpine timberline (1950 m a.s.l.). Timing and duration of complete snow...

Seasonal variations in leaf area index, leaf chlorophyll, and water content; scaling-up to estimate fAPAR and carbon balance in a multilayer, multispecies temperate forest.

Tree physiology

Gond V, De Pury DG, Veroustraete F, Ceulemans R.
PMID: 12651323
Tree Physiol. 1999 Aug;19(10):673-679. doi: 10.1093/treephys/19.10.673.

Seasonal differences in phenology between coniferous and deciduous tree species need to be considered when developing models to estimate CO(2) exchange in temperate forest ecosystems. Because seasonal variations in CO(2) flux in temperate forests are closely correlated with plant...

Potential errors in measurement of nonuniform sap flow using heat dissipation probes.

Tree physiology

Clearwater MJ, Meinzer FC, Andrade JL, Goldstein G, Holbrook NM.
PMID: 12651324
Tree Physiol. 1999 Aug;19(10):681-687. doi: 10.1093/treephys/19.10.681.

The empirical calibration of Granier-type heat dissipation sap flow probes that relate temperature difference (DeltaT) to sap velocity (v) was reevaluated in stems of three tropical tree species. The original calibration was confirmed when the entire heated probe was...

Relationships between gas exchange and carbon isotope discrimination of Sitka x interior spruce introgressive genotypes and ribosomal DNA markers.

Tree physiology

Fan S, Grossnickle SC, Sutton BC.
PMID: 12651325
Tree Physiol. 1999 Aug;19(10):689-694. doi: 10.1093/treephys/19.10.689.

Effects of hybridization on physiological performance were investigated in seven natural introgressive populations and one F(1) population of Sitka (Picea sitchensis (Bong.) Carr.) x interior spruce (P. glauca (Moench) Voss. x P. engelmannii Parry ex Engelm.). Each population was...

Freezing cycles enhance winter injury in Picea rubens.

Tree physiology

Lund AE, Livingston WH.
PMID: 12651334
Tree Physiol. 1999 Jan;19(1):65-69. doi: 10.1093/treephys/19.1.65.

We examined changes in chlorophyll absorbency in red spruce (Picea rubens Sarg.) foliage in response to simulated freezing cycles. Current-year branch tips were collected from 16 trees on January 8, January 20, February 8 and February 26, 1996. Tissue...

Does leaf water efficiency vary among eucalypts in water-limited environments?.

Tree physiology

Hatton T, Reece P, Taylor P, McEwan K.
PMID: 12651339
Tree Physiol. 1998 Aug-Sep;18(8):529-536. doi: 10.1093/treephys/18.8-9.529.

There is a need to generalize water use behavior of eucalypts to facilitate bioengineering and landscape remediation programs in a wide range of Australian environments. A critical question can be stated as a null hypothesis: tree water use per...

Showing 1 to 12 of 1415 entries