Seedling performance of pasture species under elevated CO2
Seedling performance of pasture species under elevated CO2
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DOI：
10.1046/j.1469-8137.2001.00100.x
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发表时间：
2001-05-01
期刊：
影响因子：
9.4
通讯作者：
Clark, H
中科院分区：
文献类型：
--
作者：
Edwards, GR;Newton, PCD;Clark, H
本文介绍了CO2浓度升高对牧草植物黄花菜、卷耳、石龙子、多年生黑麦草、草地早熟禾和白三叶。种子收集自保持在环境温度下的牧场（360穆尔（-1））和升高（475穆尔l（-1））CO2浓度下，采用互反设计，研究了不同CO2浓度对萌发和幼苗生长的影响。odoratum和L.多年生植物从升高CO2发达的种子比那些从环境CO2发达的种子，但只有当幼苗生长在升高CO2。CO2浓度升高处理的种子具有较高的发芽率和幼苗质量。匍匐茎的发芽率和幼苗质量较低。saxatilis，无论CO2浓度播种后。有更多的L。saxatilis和T：在牧场上的repens幼苗保持在高于环境CO2;种子添加实验表明，这主要是由于这些物种在CO2升高下的种子产量增加。C. CO2浓度升高对植物种子发育的影响不明显，可能通过影响幼苗补充来改变群落组成。
The effects of elevated CO2 on seedling recruitment are presented for the pasture species Anthoxanthum odoratum, Cerastium glomeratum, Leontodon saxatilis, Lolium perenne, Poa pratensis and Trifolium repens.Seeds collected from pastures maintained at ambient (360 mul l(-1)) and elevated (475 mul l(-1)) CO2 were measured for germination and seedling growth in a reciprocal design under ambient and elevated CO2.Seedlings of A. odoratum and L. perenne from elevated-CO2-developed seeds were heavier than those from ambient-CO2-developed seeds but only when the seedlings were grown at elevated CO2. Elevated-CO2-developed seeds had higher germination and seedling mass in T. repens and lower germination and seedling mass in L. saxatilis, irrespective of the CO2 concentration after sowing. There were more L. saxatilis and T: repens seedlings in pastures maintained at elevated than ambient CO2; a seed addition experiment showed that this was due mainly to the increased seed production of these species under elevated CO2. Seedling recruitment of C. glomeratum and P. pratensis was unaffected by elevated CO2.Species exhibited variable responses to seed development under elevated CO2 that could potentially alter community composition by influencing seedling recruitment.