Biomass and production of the riparian shrub Salix gracilistyla
Biomass and production of the riparian shrub Salix gracilistyla
复制标题
河岸灌木柳的生物量和生产
DOI：
10.3825/ece.6.35
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
T. Nakatsubo
中科院分区：
文献类型：
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作者：
A. Sasaki;T. Nakatsubo
灌木状柳柳。是日本河流中上游河岸植被的优势植物之一，在日本的河流修复实践中得到了应用。在这项研究中，我们测量了广岛县大田川河河滩上的一种细毛松的生物量和生产量。从2000年5月至10月和12月，每月测定植株茎粗与干重之间的异速生长关系。为了确定增厚生长，我们测量了随机选择的地上部的直径。5~10月，地上部茎粗增加30%，表现出相当大的增厚生长。利用异速生长关系估算的地上部生物量在5月(0.9kgm-2)至9月份(2.2kgmm-2)期间增加，之后由于落叶而下降。9月叶生物量达到0.6 kg mm-2，现枝生物量达到0.3 kg mm-2。5~12月老枝干生物量增量为0.4 kg mm-2。次年2月开挖测定的地下生物量为1.6 kg mm-2。纤细管藻的地上生产量估计为1.3公斤mm-2年-1。这一数值与其他先锋树木和温带森林的数值相当。我们的结果表明，尽管细毛藻的地上生物量很小，但仍具有很高的生产潜力。
The shrubby willow Salix gracilistyla Miq. is one of the dominant plants in the riparian vegetation of the upper-middle reaches of rivers in Japan and has been used in river restoration practice in Japan. In this study, we measured the biomass and production of a S. gracilistyla stand on a fluvial bar in the Ohtagawa River, Hiroshima Prefecture. Allometric relationships between the stem diameter and the dry weights of plants were determined every month from May to October and in December 2000. To determine the thickening growth, we measured the diameters at ground level of randomly selected shoots. From May to October, the stem diameter at ground level increased by 30%, showing considerable thickening growth. The aboveground biomass, estimated from the stem diameter by using the allometric relationship, increased from May (0.9 kg m-2) to September (2.2 kg mm-2) and decreased thereafter because of leaf shedding. In September, leaf and current branch biomass reached 0.6 and 0.3 kg mm-2 respectively. The biomass increment of old branches and stems from May to December was 0.4 kg mm-2. The underground biomass determined by digging in the following February was 1.6 kg mm-2. The aboveground production of S. gracilistyla was estimated to be 1.3 kg mm-2 yr-1. This value is comparable to those of other pioneer trees and temperate forests. Our results suggest that S. gracilistyla has a high potential for production despite its small aboveground biomass.