THE ROLE OF SOIL CHARACTERISTICS IN THE SUCCESSION OF TWO HERBACEOUS LIANAS IN A MODIFIED RIVER FLOODPLAIN
THE ROLE OF SOIL CHARACTERISTICS IN THE SUCCESSION OF TWO HERBACEOUS LIANAS IN A MODIFIED RIVER FLOODPLAIN
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DOI：
10.1002/rra.1374
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发表时间：
2011-06-01
影响因子：
2.2
通讯作者：
Uchida, T.
中科院分区：
文献类型：
--
作者：
Asaeda, T.;Rashid, Md. H.;Uchida, T.
1960年以后，日本玉川洪泛区植物群落结构发生了一系列变化。今天，两种主要的藤本植物--野葛和Sicyos angulatus --已经在该地区定居，并在争夺空间。本研究探讨了它们的竞争能力与多摩河下游的土壤因子和洪水干扰的关系。这些物种的几个殖民地选择在三个点的玉川洪泛平原具有不同的土壤特性和洪水频率。结果表明，S.小角贝只能生长在细泥沙上，而裂叶贝可以生长在各种粒径的土壤上。土壤水分和氮素需求较高的S。具角的S.小角沙蚕只生长在细颗粒泥沙上，原因有两个：一是细颗粒泥沙储存了较高浓度的氮和水分; angulatus具有非常浅的根系。裂叶连翘具有广泛的根瘤根系，可以在氮含量较低的粗糙和相对干燥的土壤中茁壮成长。但裂叶松对土壤磷的需求量高于裂叶松。angulatus有。S.多摩川洪泛平原上的angulatus是由洪水引起的，当时多年生的芒草和其他物种捕获了细小的沉积物。由于植物分解作用，沉积物逐渐变细并富含营养盐，S。angulatus入侵了该地区。当时的土壤深度不足以容纳裂叶连翘的根系。随后，裂叶拟青霉（P. lobata）在竞争中战胜了S.在各种类型的土壤上生长的angulatus。洪水对细基质的严重冲刷使该地区不适合S。而P. lobata继续茁壮成长。版权所有（C）2010约翰威利父子有限公司
The Tamagawa floodplain of Japan experienced a series of changes in the structure of its plant community after 1960. Today, two dominant lianas - Pueraria lobata and Sicyos angulatus - have colonized the area and are competing for space. This study explores their competitive abilities in relation to soil factors and flooding disturbance downstream of the Tama River. Several colonies of these species were selected in three spots of the Tamagawa floodplain having different soil characteristics and flooding frequencies. Our results revealed that S. angulatus can only grow on fine sediment, whereas P. lobata can grow on soil with a wide range of particle sizes. Soil moisture and nitrogen requirements are higher for S. angulatus. S. angulatus grows only on fine sediment for two reasons: first, fine sediment stores a higher concentration of nitrogen and moisture; second, S. angulatus has a very shallow root system. P. lobata has an extensive root system with nodules, with which it can thrive on coarse and relatively dry soil with lower nitrogen. However, P. lobata requires higher soil phosphorus than S. angulatus does. The earlier patchy colonization of S. angulatus on the Tamagawa floodplain was provoked by flooding, when the perennial Miscanthus sacchariflorus and other species trapped fine sediments. Gradually, sediments became finer and nutrient-rich due to vegetative decomposition, and S. angulatus invaded the area. The soil at that time was not deep enough for the root system of P. lobata. Subsequently, P. lobata outcompeted S. angulatus on the various types of soil that developed. Severe washing of fine substrates by floodwaters makes the area unsuitable for S. angulatus, whereas P. lobata continues to thrive. Copyright (C) 2010 John Wiley & Sons, Ltd.