Monthly Variations of Carbohydrates and Nitrogen in Roots of Sandhill Oaks and Wiregrass

Woods, Frank W.; Harris, Hannah; Caldwell, R. E.

doi:10.2307/1930040

Cited by 35 publications

(18 citation statements)

References 1 publication

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“…The percentage of live fine root dry matter as total nonstructural carbohydrate (TNC) was higher in the plantation than the hardwoods ( Table 2). The ranges measured here were similar to starch concentrations obtained for oak fine roots by Woods et at. (1959), who reported a range of 6-8% in May and 17-18% in November.…”

Section: Resultssupporting

confidence: 90%

The Role of Fine Roots in the Organic Matter and Nitrogen Budgets of Two Forested Ecosystems

McClaugherty¹,

Aber²,

Melillo³

1982

Ecology

511

282

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Standing crop, rates of production, mortality, decomposition, and nitrogen dynamics of two size classes of fine roots (0—05 mm and 0.5—3.0 mm diameter) were estimated for 1 yr in a 53—yr—old red pine (Pinus resinosa Ait.) plantation and in an adjacent 80—yr—old mixed hardwood stand in north—central Massachusetts. Dry matter of live fine roots was higher in the hardwoods (mean = 6.1 Mg/ha; annual range 3.6—8.6 Mg/ha) than in the plantation (mean = 5.1 Mg/ha; annual range 2.5—7.8 Mg/ha.) Dead root mass was similar in the hardwoods (mean = 4.4 Mg/ha) and the plantation (mean = 4.0 Mg/ha). Nitrogen standing crop of live roots in the hardwoods was higher than in the plantation (mean = 65 kg/ha and 42 kg/ha, respectively). Net fine root production was estimated from changes in standing crop. Production estimates ranged from 4.1 to 11.4 Mg°ha—1°yr—1 in the hardwoods and from 3.2 to 10.9 Mg°ha—1°yr—1 in the plantation, depending on the assumptions made in the calculations. Concurrent estimates of total nitrogen requirement for this production ranged from 73 to 184 kg°ha—1°yr—1 in the hardwoods and from 44 to 122 kg°ha—1°yr—1 in the plantation. Decomposition, measured as mass loss from buried cloth bags, was °20% in 0.4—mm mesh bags and as high as 47% in 3—mm mesh bags after 1 yr. Integrating production and nitrogen requirements with estimates of decomposition rates and nitrogen mineralization for these ecosystems suggested that the lower estimates of production are more accurate.

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Section: Resultssupporting

confidence: 90%

The Role of Fine Roots in the Organic Matter and Nitrogen Budgets of Two Forested Ecosystems

McClaugherty¹,

Aber²,

Melillo³

1982

Ecology

511

282

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“…However, McClaugherty et al (1982) found N concentrations in roots 0.5-3.0-mm to increase in both the fall and spring. Woods et al (1959) also reported high root N concentrations in the spring, having increased gradually from mid-summer lows in the roots of Quercus incana Batr. and Q. laevis Walt.…”

Section: Discussionmentioning

confidence: 87%

Seasonal nitrogen and carbon concentrations in white, brown and woody fine roots of sugar maple (Acer saccharum Marsh)

1990

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“…5 Hypothesized relationships between root and shoot biomass, and relative photosynthate allocation to each, following aboveground disturbance (f). Root biomass remains greater than shoot biomass after disturbance though allocation to roots is comparatively small Storage Similar species of rhizomatous oaks have been reported to store enough C belowground that repeated, complete aboveground harvests may not kill the rhizomes (Woods et al 1959). It has been suggested that plant species can develop prolific belowground root structures not as a conduit for C transfer, but primarily as an accessible C pool to support regrowth following severe aerial disturbances (Lacey 1974;Landa et al 1992;Matlack 1997).…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, the primary long-term storage organs are unknown for many species. Trees can utilize a variety of organs as primary C reservoirs including boles (Sakai and Sakai 1998), burls (James 1984), rhizomes (Lacey 1974), lignotubers (Mesleard and Lepart 1989), thick roots (Rodgers et al 1995) or intermediate roots (Woods et al 1959). C in "storage organs" is not always remobilizable, while C in other organs considered static may actually be mobile (Chapin et al 1990).…”

Section: Introductionmentioning

confidence: 99%

Extensive belowground carbon storage supports roots and mycorrhizae in regenerating scrub oaks

2002

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Portions of a regenerating scrub oak ecosystem were enclosed in open-top chambers and exposed to elevated C0 2 . The distinct 13 C signal of the supplemental C0 2 was used to trace the rate of C integration into various ecosystem components. Oak foliage, stems, roots and ectomycorrhizae were sampled over 3 years and were analyzed for 13 C composition. The aboveground tissue 13 C equilibrated to the novel 13 C signal in the first season, while the belowground components displayed extremely slow integration of the new C. Roots taken from ingrowth cores showed that 33% of the C in newly formed roots originated from a source other than recent photosynthesis inside the chamber. In this highly fireprone system, the oaks re-establish primarily by resprouting from large rhizomes, demobilization from belowground C stores may support fine roots and mycorrhizae for several years into stand re-establishment and, therefore, may explain why belowground tissues contain less of the new photosynthate than expected. Though it has been shown that long-term cycles of C storage are theoretically advantageous for plants in systems with frequent and severe disturbances, such patterns have not been previously examined in wild systems.

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Monthly Variations of Carbohydrates and Nitrogen in Roots of Sandhill Oaks and Wiregrass

Cited by 35 publications

References 1 publication

The Role of Fine Roots in the Organic Matter and Nitrogen Budgets of Two Forested Ecosystems

The Role of Fine Roots in the Organic Matter and Nitrogen Budgets of Two Forested Ecosystems

Seasonal nitrogen and carbon concentrations in white, brown and woody fine roots of sugar maple (Acer saccharum Marsh)

Extensive belowground carbon storage supports roots and mycorrhizae in regenerating scrub oaks

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