Annual variation in needle fall of a loblolly pine stand in relation to climate and stand density

Hennessey, Thomas; Dougherty, Phillip M.; Cregg, Bert M.; Wittwer, Robert F.

doi:10.1016/0378-1127(92)90332-4

Cited by 81 publications

(69 citation statements)

References 8 publications

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“…Chemical composition of litterfall and annual infl ux of elements to the soil depends on several factors, such as species composition of forest stand [2,3,6,15,16,18,23], tree age [1,24], stand density [12], site [1,7,26] and climate conditions [6]. Extreme phenomena, such as droughts or pest gradations sometimes play an important role too [9,17].…”

Section: Introductionmentioning

confidence: 99%

The Content of Heavy Metals in the Soil and Litterfall an a Beech-Pine-Spruce Stand in Northern Poland

Jończak¹,

Parzych²

2014

Archives of Environmental Protection

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Abstract:The concentrations of Cu, Mn, Ni and Zn in the soil and litterfall, as well as infl ux of the elements to the soils with litterfall were studied in a mixed beech-pine-spruce stand in northern Poland during the years [2007][2008][2009]. Annual infl ux of litterfall to the soil amounted from 3.234 to 4.871 t/ha. Beech, pine and spruce litterfall contributed in total litterfall in 50.8−70.1%, 11.4−11.9% and 1.6−24.0% respectively. The following average annual concentrations of heavy metals in total litterfall during the 3-year study period were noticed: 2469.3-3469.2 mg Mn/kg, 153.6-160.8 mg/kg Zn, 8.0-14.3 mg Ni/kg and 5.0-6.8 mg Cu/kg. In general, the concentrations of Mn and Cu were higher in beech litterfall in comparison to pine and spruce. The contents of Zn and Ni in beech, pine and spruce litterfall were comparable. Annual infl ux of metals to the soil with litterfall was: 10341.6-14422.4 g/ha Mn, 460.3-748.1 g/ha Zn, 37.4-66.6 g/ha Ni and 20.2-31.8 g/ha Cu. The fl uxes were higher for Mn, Zn and Ni, and comparable for Cu in relation to those observed in other beech, pine, spruce and mixed stands in northern Europe.

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Section: Introductionmentioning

confidence: 99%

The Content of Heavy Metals in the Soil and Litterfall an a Beech-Pine-Spruce Stand in Northern Poland

Jończak¹,

Parzych²

2014

Archives of Environmental Protection

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“…Some studies have shown that mean annual litterfall may be dependent on several ecological factors, for Time (Months) example, tree species, climate, site quality, and stand increment, thinning, age, and density (Bray and Gorham, 1964;Stohlgren, 1988;Hennessey et al, 1992;Miller et al, 1996;Xu and Hirata, 2002). In this study among the three forests there were considerable differences in stand age and density, and species composition; however, litter production was not significantly different for all forest sites (Table 11).…”

Section: Discussionmentioning

confidence: 50%

Nutrient and Litter Patterns in Three Subalpine Coniferous Forests of Western Sichuan, China

Lin

Liu

et al. 2006

Pedosphere

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“…As such, nitrogen limitations in loblolly pine forests restrict the maximum LA1 attainable, provided water is not limiting (NCSFNC 1991). Droughty conditions will induce premature foliage senescence (Dougherty et al 1995), and reduced development of the next year's foliage cohort (Hennessey et al 1992).…”

Section: Discussionmentioning

confidence: 99%

“…For any unit LAI, increased water availability or decreased evaporative demand (Teskey et al 1987) and increased ambient CO2 and/or increased foliar nitrogen concentration (Murthy et al in press) Increases photosynthesis and, therefore, productivity. Climate influences both the yearly pattern in foliage biomass accretion (Dougherty et al 1995) and foliage senescence (Hennessey et al 1992). Characterization of the magnitude and seasonal pattern in LAI, and site description of stand structure and soil water availability (McNulty et al 1994), in conjunction with natural climatic variability, wlll strongly influence NPP in regional slmulations.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the UKMO and GFDL GCM climate projections in NPP simulations for southern loblolly pine stands

Da¹,

Cooter²,

Pm³

et al. 1996

Clim. Res.

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We used the process model BIOMASS version 13.0 to simulate contemporary net pnmary production (NPP) and NPP response to climate prolections for a doubhng of atmospheric CO2 concentration from 2 general circulation models (GCMs) that vary in their CO2 sensitivity: the less sensitive GFDL and the more sensitive UKMO. Increased GCM sensitivity to CO2 is reflected in increased predictions in the magnitude, vanation, and range of the clunate variables. Smulations used a 40 yr historical climate record, and 2 stand and site conditions to standardize the total NPP response estimates for eighteen 1x1" grid cells across the southern U n~t e d States. Contemporary NPP and NPP response estimates from the 18 cells were smoothed using a cell search algonthm to obtain a n NPP response index matrix for the entlre loblolly pine (Pinus taeda) forest-type We conducted a sensitivity analysis of the environmental variables projected to change in a 2xC0, environment to help interpret simulation output. Contemporary NPP varied from 2.5 to 8.5 Mg C ha-' yr-' over the range of loblolly pine High leaf area index (LA1) sirnulations had 1.5 to 2 times the productlvity of low LA1 simulations, but the regional patterns were similar, NPP was correlated with regional ddferences in precipitation and temperature. The NPP response to future climate and atmospheric changes depended on the GCM used, and on the stand and site condition assumed. Inter-annual estimates for the 18 cell simulations resulted in a +22 to + 8 4 % NPP response for the GFDL climate projections and a -30 to +94% NPP response for the UKMO clunate prolections. The 40-year average NPP response for the smoothed data ranged from + 4 3 to + 6 5 % and 1 to + 9 4 % for the GFDL and the UKMO climate prolections, respectively. Consequently, the magnitude and range of the 40-year average NPP response to the climate prolections was directly correlated with the GCM CO2 sensitivity. Although ~ncreased CO2 sensitivity resulted in broader extremes in the predicted temperature response, precipitation response for the 2 models was similar. The NPP response was also correlated with the patterns in predicted climate change, w~t h regional differences coupled to local climatic conditions. Climate projections from both models produced similar NPP responses when predicted temperatures and precipitation regvnes were similar. Elevated ambient CO2 had a greater effect on NPP response than temperature or precipitation in the sensitivity comparisons. Simulations indicate that a CO2 fertilizer effect, assuming no CO2 acclimation, more than compensates for decllnes in productlvity over most of the loblolly pine forest-type associated with projected decreased precipitation and/or projected low to moderate increases in temperature and, therefore, increased maintenance respiration costs.

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Annual variation in needle fall of a loblolly pine stand in relation to climate and stand density

Cited by 81 publications

References 8 publications

The Content of Heavy Metals in the Soil and Litterfall an a Beech-Pine-Spruce Stand in Northern Poland

The Content of Heavy Metals in the Soil and Litterfall an a Beech-Pine-Spruce Stand in Northern Poland

Nutrient and Litter Patterns in Three Subalpine Coniferous Forests of Western Sichuan, China

Comparison of the UKMO and GFDL GCM climate projections in NPP simulations for southern loblolly pine stands

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