A comparative study of the growth and morphology of eight grass species from habitats with different nutrient availabilities.
A comparative study of the growth and morphology of eight grass species from habitats with different nutrient availabilities.
复制标题
对来自不同养分有效性生境的八种草种的生长和形态的比较研究。
DOI：
10.2307/2389891
复制
发表时间：
1993
影响因子：
5.2
通讯作者：
F. Berendse
中科院分区：
文献类型：
--
作者：
W. Elberse;F. Berendse
1.为了找出哪些特性使植物在营养贫乏的生境中占优势，哪些特性有利于营养丰富的生境中的物种，我们在温室控制条件下，通过盆栽试验研究了8种土壤肥力不同的多年生草本植物的生长和形态。2.该品种生长在营养贫富两种条件下。它们对养分供应的反应从最小到最大依次为：羊茅、红羊茅、斑茅、高羊茅、草地碱茅、草地早熟禾、高羊茅、黑麦草。3.响应与物种的Ellenberg氮值呈正相关。不同种间的初始相对生长率没有差异，但在4周后，由于胚乳重量的差异，植株干重随着施氮量的增加而增加。4.富营养型草场的树种高度较高，光合作用面积的垂直分布更均匀，叶面积大多在15 cm以下。与营养丰富的树种相比，营养贫乏生境的树种分配给根的干物质较少，因此分配给地上部的干物质较多。然而，叶和根的形态似乎最明显地适应了栖息地。5.营养丰富生境的树种的比叶面积(SLA)高于营养贫瘠生境的树种，而营养贫瘠生境的树种单位根重的根长(SRL)大于营养丰富的树种。
1. To find out which properties enable plant species to dominate in nutrient-poor habitats and which properties benefit species in nutrient-rich habitats, we studied the growth and morphology of eight perennial grass species from habitats with contrasting soil fertilities in a pot experiment under controlled conditions in a glasshouse. 2. The species were grown under nutrient-poor and nutrient-rich conditions. Ranked from the least responsive to the most responsive to the supply of nutrients they were: Festuca ovina, F. rubra, Anthoxanthum odoratum, F. arundinacea, Alopecurus pratensis, F. pratensis, Arrhenatherum elatius, Lolium perenne. 3. The response correlated positively with the Ellenberg nitrogen number of the species. No differences in initial relative growth rate were found between the species, but after 4 weeks the plant dry weight increased with increasing nitrogen number as a result of variation in embryo plus endosperm weight. 4. Species characteristic of nutrient-rich hayfields are taller and show a more homogeneous vertical distribution of photosynthetic area than the species from nutrient-poor habitats, which have most of their leaf area below 15 cm. Species from the nutrient-poor habitats allocated less dry matter to the roots and consequently more to the shoot, than species from nutrient-rich conditions. However, leaf and root morphology seem to be most clearly adapted to the habitat. 5. Species from nutrient-rich habitats have a higher specific leaf area (SLA) than species from nutrient-poor habitats, while species from nutrient-poor habitats had more root length per unit root weight (SRL) than species from nutrient-rich habitats.