Radial variations in xylem sap flux in a temperate red pine plantation forest

Predictive models for radial sap flux variation in coniferous, diffuse-porous and ring-porous temperate trees.

Accurately scaling sap flux observations to tree or stand levels requires accounting for variation in sap flux between wood types and by depth into the tree. However, existing models for radial variation in axial sap flux are rarely used because they are difficult to implement, there is uncertainty about their predictive ability and calibration measurements are often unavailable. Here we compar...

Sinks for 15n-enriched Additions to an Oak Forest and a Red Pine Plantation

We added 15N tracers to reference plots (receiving ambient N inputs) and to chronically fertilized plots (50 kg NH4NO3-N·ha·yr for 3 yr prior to and during tracer additions) in an oak-dominated deciduous forest and a red pine plantation in order to quantify sinks for N inputs to these forests. Plots (30 3 30 m) were located at the Harvard Forest Long-Term Ecological Research (LTER) site in cent...

Running head: Sap flow in riparian trees Transpiration of cottonwood/willow forest estimated from sap flux

Elevated CO2 enrichment induces a differential biomass response in a mixed species temperate forest plantation.

In a free-air carbon dioxide (CO(2)) enrichment study (BangorFACE), Alnus glutinosa, Betula pendula and Fagus sylvatica were planted in areas of one-, two- and three-species mixtures (n = 4). The trees were exposed to ambient or elevated CO(2) (580 μmol mol(-1)) for 4 yr, and aboveground growth characteristics were measured. In monoculture, the mean effect of CO(2) enrichment on aboveground woo...

Forest thinning and soil respiration in a ponderosa pine plantation in the Sierra Nevada.

Soil respiration is controlled by soil temperature, soil water, fine roots, microbial activity, and soil physical and chemical properties. Forest thinning changes soil temperature, soil water content, and root density and activity, and thus changes soil respiration. We measured soil respiration monthly and soil temperature and volumetric soil water continuously in a young ponderosa pine (Pinus ...