Comparison between biomass and C, N, P, S contents of vigorous and die-back reed stands of Lake Fertő/Neusiedler See
Comparison between biomass and C, N, P, S contents of vigorous and die-back reed stands of Lake Fertő/Neusiedler See
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费尔特湖/新锡德勒湖旺盛芦苇丛和枯死芦苇丛生物量和碳、氮、磷、硫含量比较
DOI：
10.2478/s11756-010-0006-x
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发表时间：
2010
期刊：
影响因子：
1.5
通讯作者：
P. Szeglet
中科院分区：
文献类型：
--
作者：
M. Dinka;E. Ágoston;P. Szeglet
通过对同一芦苇带内旺枯点的产量和芦苇营养成分的分析，探讨芦苇枯梢病发生的可能原因。在1996年和1997年对FertIgn/Neusiedler See湖的3个生长旺盛和3个枯死点的地上、地下生物量及其C、N、P、S含量进行了测定。芦苇林进行了比较时，生物量在这两年最大。芦苇枝条显着（p = 5%）短，薄，节间在枯死的网站比在蓬勃发展的网站，地上生物量的1.5-2.0倍，叶面积指数（LAI）的1.7-2.5倍高。地下生物量几乎相同的蓬勃发展和枯死网站。在旺盛生长点，芦苇地下腐烂生物量占地下总生物量的50%以下，而在枯死生长点，芦苇地下腐烂生物量占地下总生物量的75%以上。枯梢部位叶片、茎和根茎中N含量较高，P含量最低。与退化芦苇相比，退化芦苇各器官的硫含量无显著差异。健康植株的C浓度高于枯死植株，而活根茎的C浓度低于枯死植株。枯梢倒梢点地上生物量中的N、P、C、S现存量显著低于旺盛点。在地下生物量中，P现存量显著低于旺长期点，而N现存量显著高于旺长期点，实际年生产的地上生物量不超过总干物质m−2的17%、C的17%、N的24%、S的14%和P的27%。
The production of vigorous and die-back sites of the same reed belt and nutrient content of reed were studied to detect possible causes of reed die-back. Shoot density, total aboveground and belowground biomass and their C, N, P and S contents were also determined.Samples were collected from three vigorous and three die-back sites of Lake Fertő/Neusiedler See in 1996 and 1997. Reed stands were compared when the biomass was maximal in both years. Reed shoots were significantly (p = 5%) shorter, thinner and had less internodes at the die-back sites than at the vigorous sites, where the aboveground biomass was 1.5–2.0 times and the leaf area index (LAI) 1.7–2.5 times higher. The belowground biomass was nearly the same at the vigorous and die-back sites. The amount of decaying belowground biomass was less than 50% of the total belowground biomass at the vigorous sites, while it reached 75% at the die-back sites.Different N, C, P and S concentrations were found in the reed organs studied (leaves, culm, rhizome and roots). The N concentration in leaves, culm and rhizome was higher at the die-back sites, where the P concentration was the lowest. There were no significant differences in the S concentration of the examined reed organs as comparing the vigorous and degraded reeds. The C concentration of culms were higher, while that of the living rhizomes were lower at healthy than at the die-back sites. The N, P, C and S standing stocks in the aboveground biomass were significantly lower at the die-back sites than at the vigorous sites. In the belowground biomass the P standing stock was significantly lower, while the N standing stock was significantly higher at the die-back sites than at the vigorous sites.Not more than 17% of the total dry mass m−2, 17% of the C, 24% of the N, 14% of the S and 27% of the P standing stock was found in the aboveground phytomass produced in the actual year.