Latitudinal characteristics of below- and above-ground biomass of Typha:: A modelling approach
Latitudinal characteristics of below- and above-ground biomass of Typha:: A modelling approach
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DOI：
10.1093/aob/mci178
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发表时间：
2005-08-01
期刊：
影响因子：
4.2
通讯作者：
Roberts, J
中科院分区：
文献类型：
--
作者：
Asaeda, T;Hai, DN;Roberts, J
背景和目的香蒲属植物生长特征的纬度差异在很大程度上是未知的，尽管一些研究指出了气候对香蒲属植物生长和生产力的影响。因此，一个动态生长模型的发展，香蒲检查纬度变化的影响，在生长季节的总生物量分配到根茎，根，开花和营养枝，和influs.Methods验证模型与数据从香蒲生长研究发现在过去的文献中，它被用来调查三个纬度的地上和地下生物量的动态：30度，40度和50度关键结果无论最初的根茎生物量，地上和地下的生物量值都趋向于总产量与呼吸作用和死亡率损失之间的平衡所产生的特定纬度的平衡。在纬度10度至35度之间，尽管代谢损失很高，但由于辐射充足，地面生物量很高;然而，由于光合速率低，在较高纬度，地面生物量显著下降。另一方面，由于代谢损失减少，地下生物量随着纬度增加而增加，直到40度，然后在较高纬度显著下降。无论纬度如何，随着种群数量的增加，地上生物量都得到了提高。然而，虽然在低纬度，更多的群组导致地下生物量增加，但在高纬度，最大的地下生物量是由数量较少的群组提供的。这种差异是由于低生产率的高纬度地区的晚季同伙，相比消费拍摄和建立leavy.Conclusions该模型可用于预测的潜在增长的香蒲在给定的条件下，在很宽的纬度范围内，是有用的实际应用，如湿地管理或废水处理系统使用香蒲。
Background and Aims The latitudinal differences in the growth characteristics of Typha are largely unknown, although a number of studies have pointed out the effects of climate on the growth and productivity of Typha. Therefore, a dynamic growth model was developed for Typha to examine the effects of latitudinal changes in temperature and radiation on partitioning of the total biomass during the growing season into rhizomes, roots, flowering and vegetative shoots, and inflorescences.Methods After validating the model with data from growth studies of Typha found in past literature, it was used to investigate the dynamics of above- and below- ground biomasses at three latitudes: 30 degrees, 40 degrees and 50 degreesKey Results Regardless of the initial rhizome biomass, both above- and below- ground biomass values converged to a latitude-specific equilibrium produced by the balance between the total production and respiration and mortality losses. Above-ground biomass was high from 10 degrees to 35 degrees latitude with sufficient radiation, despite high metabolic losses; however, it decreased markedly at higher latitudes due to a low photosynthetic rate. Below-ground biomass, on the other hand, increased with latitude up to 40 degrees due to decreasing metabolic losses, and then markedly decreased at higher latitudes. Above- ground biomass was enhanced with an increasing number of cohorts regardless of latitude. However, although more cohorts resulted in a larger below- ground biomass at low latitudes, the largest below-ground biomass was provided by a smaller number of cohorts at high latitudes. This difference is due to low production rates of late-season cohorts in high latitudes, compared with consumption for shooting and establishing foliage.Conclusions The model could be used to predict the potential growth of Typha in given conditions over a wide range of latitudes and is useful for practical applications such as wetland management or wastewater treatment systems using Typha.