Comparisons of nutrient recovery and specific leaf area variation betweenCarex lasiocarpavar.occultansandCarex thunbergiivar.appendiculatawith reference to nutrient conditions and shading byPhragmites australis

KazuyukiOnimaru; KazuoYabe

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Comparisons of nutrient recovery and specific leaf area variation betweenCarex lasiocarpavar.occultansandCarex thunbergiivar.appendiculatawith reference to nutrient conditions and shading byPhragmites australis

机译：Comparisons of nutrient recovery and specific leaf area variation betweenCarex lasiocarpavar.occultansandCarex thunbergiivar.appendiculatawith reference to nutrient conditions and shading byPhragmites australis

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The distribution of two sedge species was studied in two mires which differ in abiotic environments and in distribution ofPhragmites australis. Carex lasiocarpavar.occultansdominated in nutrient-poor valley mire, andCarex thunbergiivar.appendiculatadominated in nutrient-rich flood plain subject to water fluctuations.Phragmites australisgrew well in nutrient-rich conditions. The distribution ofC. lasiocarpashowed a strong negative correlation withP. australiscoverage, whereasC. thunbergiicoverage was not affected byP. australis. The leaf area per dry leaf mass (specific leaf area: SLA) ofC. thunbergiiincreased with shading byP. australis, but that ofC. lasiocarpawas stable. The SLA flexibility ofC. thunbergiito light interception might enable this species to invadeP. australispatches in nutrient-rich environments. The residual nutrient ratio of nitrogen and phosphorus (the ratio of the residual nutrient content at the end of the growing season to peak nutrient content) in the vegetative ramet ofC. thunbergiiwas 1.7 times higher than that ofC. lasiocarpa. This low residual ratio may indicate effective nutrient recovery to storage organs. The effective nutrient recovery inC. lasiocarpamight enable this species to grow even in nutrient-poor environments. However, it may be difficult forC. lasiocarpato expand its habitat to nutrient-rich areas whereP. australisdominates as it is not shade tolerant.

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《ecological research》 |1996年第2期|139-147|共页
作者
KazuyukiOnimaru; KazuoYabe;
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Hokkaido University;

Sapporo Higashi High School;

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Comparisons of nutrient recovery and specific leaf area variation betweenCarex lasiocarpavar.occultansandCarex thunbergiivar.appendiculatawith reference to nutrient conditions and shading byPhragmites australis

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