Elevated CO2 concentration, nitrogen use, and seed production in annual plants
Elevated CO2 concentration, nitrogen use, and seed production in annual plants
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DOI：
10.1111/j.1365-2486.2007.01429.x
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发表时间：
2007-10
影响因子：
11.6
通讯作者：
K. Miyagi;T. Kinugasa;K. Hikosaka;T. Hirose
中科院分区：
文献类型：
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作者：
K. Miyagi;T. Kinugasa;K. Hikosaka;T. Hirose
大气CO2浓度升高（[CO2]）刺激种子大量生产在许多物种中，但刺激的程度显示物种之间的差异很大。我们研究了（1）种子氮浓度较低的物种是否能提高种子产量，以及（2）当植物使用更多的氮进行种子生产时，种子产量是否会因[CO2]升高而提高。我们在具有不同[CO2]条件（环境：370 μmol mol-1，升高：700 μmol-1）的开顶室中培养了11株一年生植物。[CO2]浓度升高显著增加了11个物种中的6个的种子产量，种间变异较大（0.84-2.12，升高/环境[CO2]）。种子氮浓度与[CO2]浓度升高对种子产量的影响不相关。种子产量的提高与生殖期氮吸收量的增加所引起的单株种子氮的提高密切相关。特别是，豆类物种往往获得更多的N和产生更多的种子在升高[CO2]比非固氮物种。在所有物种中，[CO2]升高对种子[N]的影响很小。我们的结论是，种子生产是有限的，主要是由氮的可用性，并将提高[CO2]只有当植物能够增加氮的收购。
Elevated atmospheric CO2 concentration ([CO2]) stimulates seed mass production in many species, but the extent of stimulation shows large variation among species. We examined (1) whether seed production is enhanced more in species with lower seed nitrogen concentrations, and (2) whether seed production is enhanced by elevated [CO2] when the plant uses more N for seed production. We grew 11 annuals in open top chambers that have different [CO2] conditions (ambient: 370 μmol mol−1, elevated: 700 μmol mol−1). Elevated [CO2] significantly increased seed production in six out of 11 species with a large interspecific variation (0.84–2.12, elevated/ambient [CO2]). Seed nitrogen concentration was not correlated with the enhancement of seed production by elevated [CO2]. The enhancement of seed production was strongly correlated with the enhancement of seed nitrogen per plant caused by increased N acquisition during the reproductive period. In particular, legume species tended to acquire more N and produced more seeds at elevated [CO2] than non‐nitrogen fixing species. Elevated [CO2] little affected seed [N] in all species. We conclude that seed production is limited primarily by nitrogen availability and will be enhanced by elevated [CO2] only when the plant is able to increase nitrogen acquisition.