Shoot regrowth and age-specific rhizome storage dynamics of Phragmites australis subjected to summer harvesting
Shoot regrowth and age-specific rhizome storage dynamics of Phragmites australis subjected to summer harvesting
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DOI：
10.1016/j.ecoleng.2004.02.006
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发表时间：
2004-04-01
影响因子：
3.8
通讯作者：
Yutani, K
中科院分区：
文献类型：
--
作者：
Karunaratne, S;Asaeda, T;Yutani, K
以芦苇（Phragmites australis（Cav.）Trin.来自Steud。在日本中部的六月，（六月伐林）和七月伐林（7月伐）及其对林分形态、地上地下生物量和根茎贮量的影响（根据年龄特定的根茎体积密度，P-rhiz），进行了调查，在自己和未切割的对照林。两个收获处理增加叶片产量和降低枝高，茎粗，而根茎年龄较大的林分，其蓄积量以6月采伐林分最低。即使年底年龄特定的根茎储备水平没有达到未切割的林分值，这两个处理加快了采后根茎储备积累速率（即P-rhiz增长率）刺激的新梢收获，特别是在年轻的根茎，并与根茎年龄呈负线性相关。这项研究确定了根茎储备质量的季节性变化是适当的植被管理所必需的。7月或8月是植物修复和废水处理中使用的植物林的适当收获时间，其中较大的枝条结合的营养库存被移除，同时为随后的几年保留健康的林分。5月至6月的收获将更有效地减少增长，重复6月砍伐可能会削弱林分无法修复后，几年。(C)2004 Elsevier B. V.保留所有权利。
Shoots of a monospecific wetland stand of Phragmites australis (Cav.) Trin. ex Steud. in Central Japan were harvested during two summer months in June (June-cut stand) and July (July-cut stand) and their effects on the stand morphology, above- and below-ground biomass and rhizome storage level (in terms of age-specific rhizome bulk density, P-rhiz), were investigated between themselves and to an uncut control stand. Both harvesting treatments increased leaf production and decreased shoot height, stem diameter, and the storage accumulation capacity of older rhizome age categories, the June-cut stand showing the lowest P-rhiz. Even though the year-end age-specific rhizome reserve level did not reach to that of uncut stand values, both treatments accelerated the post-harvest rhizome reserve accumulation rates (i.e. rate of P-rhiz increment) stimulated by shoot harvesting, especially in younger rhizomes and were negatively and linearly correlated with rhizome age. The study identified the seasonal changes of the rhizome reserve quality as essential for proper vegetation management. July or August is the appropriate harvesting time for plant stands used in phytoremediation and wastewater treatment, where a larger shoot-bound nutrient stock is removed, while preserving a healthy stand for the subsequent years. A harvest in May to June would be more effective in reducing the growth, and repeated June-cutting may likely weaken the stand beyond repair after several years. (C) 2004 Elsevier B.V. All rights reserved.