The relationships among root and leaf traits of 76 grassland species and relative abundance along fertility and disturbance gradients
The relationships among root and leaf traits of 76 grassland species and relative abundance along fertility and disturbance gradients
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DOI：
10.1034/j.1600-0706.2001.930210.x
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发表时间：
2001-05-01
期刊：
影响因子：
3.4
通讯作者：
Chapin, FS
中科院分区：
文献类型：
--
作者：
Craine, JM;Froehle, J;Chapin, FS
对于美国明尼苏达州中部草原常见的 76 个一年生、二年生和多年生物种，我们确定了七个器官水平性状（比叶面积、叶厚度、叶组织密度、叶角、比根长度、平均细根直径和细根组织密度）之间的相关模式及其与与生长形态相关的两个性状（物种是否在基生、非茎生长期的部分生长季节存在）的关系。 形式以及物种是否为根茎）。性状的第一个相关性表明，禾本科植物的叶子薄而密，根细，而杂草植物的叶子厚且低密度，根粗，在生长形态或生活史方面没有显着差异。第二个性状相关性显示了从具有高密度根和高密度直立叶的物种到具有低密度根和与地面平行的低密度叶的物种的梯度。高组织密度物种更有可能在季节的部分时间内作为基部莲座丛存在，不太可能是根茎植物，也不太可能是一年生植物。我们检查了代表性状相关性的两个轴之间的关系，以及之前收集的关于跨氮添加和干扰梯度的物种相对丰度的数据。草一般比杂草丰富，草和杂草的相对丰度不随氮添加量的增加或土壤扰动而改变。随着生育力和干扰的增加，高组织密度的物种变得不那么常见。
For 76 annual, biennial, and perennial species common in the grasslands of central Minnesota, USA, we determined the patterns of correlations among seven organ-level traits (specific leaf area, leaf thickness, leaf tissue density, leaf angle, specific root length, average fine root diameter, and fine root tissue density) and their relationships with two traits relating to growth form (whether species existed for part of the growing season in basal, non-caulescent form and whether species were rhizomatous or not). The first correlation of traits showed that grasses had thin, dense leaves and thin roots while forbs had thick, low-density leaves and thick roots without any significant differences in growth form or life history. The second correlation of traits showed a gradient of species from those with high-density roots and high-density erect leaves to species with low-density roots and low-density leaves that were held parallel to the ground. High tissue density species were more likely to exist as a basal rosette for part of the season, were less likely to be rhizomatous, and less likely to be annuals. We examined the relationships between the two axes that represent the correlations of traits and previously collected data on the relative abundance of species across gradients of nitrogen addition and disturbance. Grasses were generally more abundant than forbs and the relative abundance of grasses and forbs did not change with increasing nitrogen addition or soil disturbance. High tissue density species became less common as fertility and disturbance increased.