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Fine root dynamics and tissue chemis...

Park, Byung B.

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Fine root dynamics and tissue chemistry across a calcium gradient in temperate hardwood and softwood forest ecosystems.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Fine root dynamics and tissue chemistry across a calcium gradient in temperate hardwood and softwood forest ecosystems./
作者:	Park, Byung B.
面頁冊數:	257 p.
附註:	Adviser: Ruth D. Yanai.
Contained By:	Dissertation Abstracts International67-08B.
標題:	Agriculture, Forestry and Wildlife. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3229602
ISBN:	9780542810237

Fine root dynamics and tissue chemistry across a calcium gradient in temperate hardwood and softwood forest ecosystems.
Park, Byung B.

Fine root dynamics and tissue chemistry across a calcium gradient in temperate hardwood and softwood forest ecosystems. - 257 p.

Adviser: Ruth D. Yanai.

Thesis (Ph.D.)--State University of New York College of Environmental Science and Forestry, 2006.

The effect of nutrient availability on the chemistry of fine roots and root turnover is important to terrestrial carbon and nutrient cycling, but it is poorly understood. Differences in sensitivity to soil fertility across tree species and developmental stage may influence forest response to environmental change, but these rarely have been compared in the field.

ISBN: 9780542810237Subjects--Topical Terms:

783690
Agriculture, Forestry and Wildlife.

Fine root dynamics and tissue chemistry across a calcium gradient in temperate hardwood and softwood forest ecosystems.
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245 1 0 $a Fine root dynamics and tissue chemistry across a calcium gradient in temperate hardwood and softwood forest ecosystems.
300 $a 257 p.
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502 $a Thesis (Ph.D.)--State University of New York College of Environmental Science and Forestry, 2006.
520 $a The effect of nutrient availability on the chemistry of fine roots and root turnover is important to terrestrial carbon and nutrient cycling, but it is poorly understood. Differences in sensitivity to soil fertility across tree species and developmental stage may influence forest response to environmental change, but these rarely have been compared in the field.
520 $a I estimated fine root biomass (FRB), fine root production, and nutrient turnover by coring and minirhizotron technique and aboveground production by allometric equations of hardwoods and softwoods at three Ca gradient sites: Sleepers River, VT; Hubbard Brook, NH; and Cone Pond, NH. I also measured annual growth rates and tissue chemical concentrations among species and growth stages in two contrasting base cation sites at Huntington Forest, NY.
520 $a Fine root biomass varied across sites, from 465 g m-2 to 682 g m-2, but there were no statistically significant differences among sites within forest type. Root biomass density declined with depth; 57 and 66% of FRB for hardwoods and softwoods, respectively, occurred 10 cm above soil. Surprisingly, the ratio of dead to live roots in softwoods increased as a function of depth, but there was no such change in hardwoods. Fine root turnover rates varied from low (0.62-0.71 yr-1) to high (1.32-1.86 yr-1) as Ca gradient. Fine root production ranged from 1.2 to 3.7 Mg ha-1 yr-1 for hardwood stands and from 0.9 to 2.3 Mg ha-1 yr-1 for softwood stands. Although FRB and leaf litter production were not significantly correlated to soil fertility, fine root production and the ratio of root production to leaf litter production were clearly higher in sites with higher soil fertility.
520 $a Root nutrient concentrations were significantly affected by site and root diameter. Calcium and Mg concentrations in live roots were greatest in sites with the highest concentrations of base cations. Calcium concentrations were higher in the larger roots, but P, N, and Al concentrations were higher in the finer root classes. Among sites, I found significant differences of nutrient turnover by fine roots, but not between forest types. Magnitude of differences between sites for each element ranged from 3 times for P and N to 8 times for Ca and Mg, but differences between forest types were less than 2-fold. Root Ca turnover ranged from 3 to 23 kg ha-1 yr -1 increasing exponentially with soil Ca saturation increased. The Ca gradient study suggests that greater nutrient availability leads to greater carbon allocation and nutrient inputs belowground in north temperate forest ecosystems.
520 $a In Huntington Forest, sugar maple growth (14.8 cm2 yr -1 per tree) at the site with higher base cations was much greater than at the other site (8.6 cm2 yr-1 per tree), but the growth of beech was not different between the two sites. Root and foliar Ca, K, and Al concentrations were positively correlated with soil elements, but Mn concentrations were negatively correlated. Sugar maple differed more than beech between sites in foliar K, Mn, and Zn concentrations. Sugar maple seedlings differed more than mature trees in nutrient concentrations in roots. The sensitivity of sugar maple seedlings to nutrient availability could ultimately contribute to the replacement of sugar maple by American beech in regions of low pH and base cations if base cation leaching by anthropogenic deposition and tree harvesting continues. (Abstract shortened by UMI.)
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